TY - GEN A1 - Klepel, Olaf A1 - Scholz, Kerstin A1 - Scholz, Jan A1 - McQuillan, A. James A1 - Wagner, Gerald T1 - Partially embedded highly dispersed Pt nanoparticles in mesoporous carbon with enhanced leaching stability T2 - Carbon Y1 - 2010 SN - 0008-6223 VL - 48 IS - 6 SP - 1788 EP - 1798 ER - TY - GEN A1 - Günther, David A1 - Klepel, Olaf T1 - Synthese von porösen Kohlenstoffmonolithen unter Verwendung von Porenbeton als Templat T2 - Chemie Ingenieur Technik Y1 - 2013 SN - 1522-2640 VL - 85 IS - 6 SP - 955 EP - 959 ER - TY - GEN A1 - Walter, Reni A1 - Klepel, Olaf A1 - Erler, Thomas A1 - Bron, Michael A1 - Niebrzydowska, Paula A1 - Wach, Anna A1 - Kuśtrowski, Piotr T1 - First steps on the way to a modular concept for the preparation of carbon based catalysts T2 - Catalysis Letters Y1 - 2013 SN - 1572-879X VL - 143 IS - 7 SP - 642 EP - 650 ER - TY - GEN A1 - Taubert, Michael A1 - Beckmann, Jens A1 - Lange, Andreas A1 - Enke, Dirk A1 - Klepel, Olaf T1 - Attempts to design porous carbon monoliths using porous concrete as a template T2 - Microporous and Mesoporous Materials Y1 - 2014 SN - 1387-1811 VL - Vol. 197 SP - 58 EP - 62 ER - TY - GEN A1 - Utgenannt, Stephan A1 - Hansen, Felix A1 - Klepel, Olaf A1 - Jarczewski, Sebastian A1 - Wach, Anna A1 - Kuśtrowski, Piotr T1 - Control of porosity and composition of carbon based catalysts prepared by template assisted routes T2 - Catalysis Today KW - Heterogeneous catalysis Y1 - 2015 U6 - https://doi.org/10.1016/j.cattod.2014.10.036 SN - 0920-5861 VL - Vol. 249 SP - 38 EP - 44 ER - TY - GEN A1 - Klepel, Olaf A1 - Taubert, Michael A1 - Heider, Robert A1 - Erlitz, Marcel A1 - Hille, Eva A1 - Lange, Andreas A1 - Enke, Dirk T1 - Synthese von porösen Kohlenstoffmonolithen unter Verwendung von Porenbeton als Templat. Teil II: Untersuchungen mechanischer Eigenschaften T2 - Chemie Ingenieur Technik Y1 - 2015 UR - http://onlinelibrary.wiley.com/doi/10.1002/cite.201400089/pdf U6 - https://doi.org/10.1002/cite.201400089 SN - 1522-2640 SN - 0009-286X VL - 87 IS - 7 SP - 998 EP - 1002 ER - TY - GEN A1 - Klepel, Olaf A1 - Erlitz, Marcel A1 - Scholz, Kerstin A1 - Suckow, Matthias A1 - Taubert, Michael A1 - Utgenannt, Stephan A1 - Garsuch, Arnd T1 - Template assisted synthesis of porous carbons revisited – where does the porosity come from? T2 - Microporous and Mesoporous Materials Y1 - 2016 U6 - https://doi.org/10.1016/j.micromeso.2015.11.047 SN - 1387-1811 IS - vol. 224 SP - 163 EP - 167 ER - TY - GEN A1 - Klepel, Olaf A1 - Danneberg, Nina A1 - Dräger, Matti A1 - Erlitz, Marcel A1 - Taubert, Michael T1 - Synthesis of Porous Carbon Monoliths Using Hard Templates T2 - Materials Y1 - 2016 U6 - https://doi.org/10.3390/ma9030214 SN - 1996-1944 VL - 9 IS - 3 ER - TY - GEN A1 - Günther, David A1 - Beckmann, Jens A1 - Schöneich, Michael A1 - Schmidt, Peer A1 - Klepel, Olaf T1 - Porous concrete as a template for the synthesis of porous carbon materials T2 - Carbon N2 - The potential of industrial porous concrete for using as a template for the synthesis of porous carbon materials has been investigated. Carbon replicas of porous concrete have been prepared by carbonization of sucrose. The pores of the resulting carbon materials range from the macropore to the micropore region, pointing to a hierarchy. Y1 - 2012 UR - http://www.sciencedirect.com/science/article/pii/S000862231200173X?np=y U6 - https://doi.org/10.1016/j.carbon.2012.02.039 SN - 0008-6223 VL - 50 IS - 8 SP - 3092 EP - 3116 ER - TY - GEN A1 - Klepel, Olaf A1 - Danneberg, Nina A1 - Suckow, Matthias A1 - Erlitz, Marcel T1 - Carbon Replicas of Porous Concrete Obtained by Chemical Vapor Deposition - Some Aspects of the Synthesis Mechanism T2 - Materials Sciences and Applications Y1 - 2017 U6 - https://doi.org/10.4236/msa.2017.88043 SN - 2153-117X SN - 2153-1188 VL - 8 IS - 8 SP - 614 EP - 627 ER - TY - GEN A1 - Reichardt, Christina A1 - Utgenannt, Stephan A1 - Stahmann, Klaus-Peter A1 - Klepel, Olaf A1 - Barig, Susann T1 - Highly stable adsorptive and covalent immobilization of Thermomyces lanuginosus lipase on tailor-made porous carbon material T2 - Biochemical Engineering Journal N2 - Hierarchically structured, porous carbon materials (PCM) were synthesized by sucrose infiltration into template material and subsequent carbonization. Three porous carbon materials were prepared using porous concrete (PCM-01) or silica gel (PCM-02 and 03) as template. Carbon particles from 125 to 200 μm were generated. Surface carboxylic group density was determined with 1.1 mmol/g dry material for each variant. Firstly, tailor-made PCM was evaluated as suitable support for lipase immobilization. Recombinant produced lipase of Thermomyces lanuginosus (TLL) was used as model enzyme. Two independent crude immobilization strategies were applied. Residual activities of up to 8.6 U/g and 31 U/g dry material for adsorptive and covalent immobilization (linkage via EDC) were achieved, respectively. Additionally, TLL was immobilized on commercially available polymethacrylate support showing similar residual lipase activities. Secondly, covalent immobilization was optimized to generate reproducible, highly stable and active immobilizates. Optimized covalent immobilizates showed residual activities of up to 10 U∙g⁻¹ dry carbon material using p-nitrophenyl-palmitate assay and protein loads of up to 45 mg g⁻¹dry carbon material. Covalent bound TLL-PCM showed storage stability for 12 months, remaining 100% of the initial activity. Operational stability resulted in stable and 100% active immobilizates over five consecutive cycles of use. Experiments showed that tailor-made porous carbon material is a promising support for lipase immobilization, which is adaptable in shape and dimension. KW - Lipase KW - Covalent immobilization KW - Adsorption KW - Carbon material Y1 - 2018 U6 - https://doi.org/10.1016/j.bej.2018.07.003 SN - 1873-295X IS - 138 SP - 63 EP - 73 ER - TY - GEN A1 - Klepel, Olaf A1 - Lange, Felix A1 - Utgenannt, Stephan T1 - Oxidation of sulfurous acid on carbon catalysts as a test reaction revisited: potential and limitations T2 - Chemical engineering & technology Y1 - 2018 U6 - https://doi.org/10.1002/ceat.201800227 SN - 1521-4125 SN - 0930-7516 VL - 41 IS - 10 SP - 2087 EP - 2092 ER - TY - CHAP A1 - Barig, Susann A1 - Utgenannt, Stephan A1 - Heine, Alexander A1 - Reichardt, Christina A1 - Klepel, Olaf A1 - Schnitzlein, Klaus A1 - Stahmann, Klaus-Peter T1 - Poröses Kohlenstoffmaterial zur Immobilisierung von Lipase–Vergleichende Messungen mit Methacryl‐Beads T2 - Chemie Ingenieur Technik N2 - Zur Immobilisierung von Enzymen kann man Träger kaufen oder diese selbst herstellen. In früheren Arbeiten wurde ein Verfahren entwickelt, um hochporöse Kohlenstoffmaterialien in beliebigen Dimensionen herzustellen. Als Modell-Enzym zur Immobilisierung wurde die Thermomyces lanuginosus Lipase (TLL) gewählt, die adsorptiv und kovalent an das Material sowie an zwei käufliche Trägermaterialien auf Polymethacryl-Basis (Funktionalitäten: Ethylendiamin- bzw. Diolgruppen)gebunden werden sollten. Es wurden Kohlenstoffgranulat (d = 125 –200 mm) und zylindrische Monolithe (h = 4 cm; d = 1 cm) synthetisiert. Die adsorptive Immobilisierung ergab am Kohlenstoffgranulat Aktivitäten von bis zu 2,5Ug⁻¹ gegenüber p-Nitrophenyl Palmitat (pNPP). Bei den zwei käuflichen Materialien wurden Aktivitäten von bis zu 1,8Ug⁻¹ erreicht. Mit der kovalenten Immobilisierung konnten Aktivitäten von bis zu 10Ug⁻¹ am Kohlenstoffmaterial sowie dem Polymethacryl-Material (–OH funktionalisiert) gegenüber pNPP erreicht werden. Das Kohlenstoffmaterial ist ein geeigneter Träger für die TLL, der im Vergleich mit gängigen Materialien Aktivitäten in der gleichen Größenordnung zulässt. Das Porenvolumen des Materials sowie die Makroporosität könnten erhöht werden, um Diffusions- und Durchströmungsbarrieren im Monolithen abzubauen. KW - Immobilisierung Enzyme KW - poröses Kohlenstoffmaterial Y1 - 2016 U6 - https://doi.org/10.1002/cite.201650097 SN - 1522-2640 N1 - ProcessNet‐Jahrestagung und 32. DECHEMA‐Jahrestagung der Biotechnologen, Aachen, 2016 VL - 88 IS - 9 SP - S. 1243 ER - TY - RPRT A1 - Klepel, Olaf T1 - Entwicklung mikroporöser Kohlenstoffmonolithe für Anwendungen in der Luft- und Kältetechnik Y1 - 2015 U6 - https://doi.org/10.2314/GBV:870371126 N1 - Förderkennzeichen BMBF 03FH028I2 PB - Brandenburgische Technische Universität CY - Cottbus ; Senftenberg ER - TY - GEN A1 - Klepel, Olaf A1 - Taubert, Michael T1 - Attempts to design porous carbon monoliths using porous concrete as a template - Part II: Some aspects of the pore formation mechanism T2 - Microporous Mesoporous Mater Y1 - 2019 U6 - https://doi.org/10.1016/j.micromeso.2019.02.024 SN - 1387-1811 VL - 280 SP - 243 EP - 247 ER - TY - CHAP A1 - Klepel, Olaf A1 - Walter, Reni A1 - Günther, David A1 - Niebrzydowska, Paula A1 - Wach, Anna A1 - Kuśtrowski, Piotr T1 - Carbon materials prepared by template assisted routes as catalysts for oxidative dehydrogenation of ethylbenzene T2 - 5th International Sypmosium on “Carbon on Catalysis”, Books of abstracts, Bressanone/Brixen, 2012 Y1 - 2012 SP - S. 92 ER - TY - CHAP A1 - Walter, Reni A1 - Günther, David A1 - Klepel, Olaf A1 - Schilling, Thorsten A1 - Erler, Thomas A1 - Bron, Michael T1 - Carbon materials prepared by template assisted routes as catalysts for electrochemical oxygen reduction T2 - 5th International Sypmosium on “Carbon on Catalysis”, Books of abstracts, Bressanone/Brixen, 2012 Y1 - 2012 ER - TY - CHAP A1 - Taubert, Michael A1 - Beckmann, Jens A1 - Zimmermann, Jörg A1 - Lange, Andreas A1 - Enke, Dirk A1 - Klepel, Olaf T1 - Template synthesis of carbon monoliths based on porous concrete T2 - Carbon materials for ubiquitous and sustainable life : Annual World Conference on Carbon (Carbon 2014) ; Jeju, Korea, 27 June - 4 July 2014 ; [abstracts] Y1 - 2014 UR - http://www.gbv.de/dms/tib-ub-hannover/828233470.pdf SN - 9781634399050 SP - S. 511 PB - Curran CY - Red Hook, NY ER - TY - CHAP A1 - Erlitz, Marcel A1 - Danneberg, Nina A1 - Klepel, Olaf T1 - Template assisted synthesis of porous carbon: insight in the process of the carbon deposition in the template T2 - Carbon 2015 : innovation with carbon materials; the Annual World Conference on Carbon, Dresden, Germany, July 12 - 17, 2015 Y1 - 2015 SP - S. 21 PB - Deutsche Keramische Gesellschaft e.V. CY - Köln ER - TY - CHAP A1 - Taubert, Michael A1 - Dräger, Matti A1 - Enke, Dirk A1 - Klepel, Olaf T1 - Carbon monoliths with hierarchical pore system obtained by template assisted synthesis T2 - Carbon 2015 : innovation with carbon materials; the Annual World Conference on Carbon, Dresden, Germany, July 12 - 17, 2015 Y1 - 2015 SP - S. 41 PB - Deutsche Keramische Gesellschaft e.V. CY - Köln ER - TY - CHAP A1 - Utgenannt, Stephan A1 - Hansen, Felix A1 - Klepel, Olaf A1 - Jarczewski, Sebastian A1 - Wach, Anna A1 - Kustrowski, Piotr A1 - Erler, Thomas A1 - Bron, Michael T1 - A modular concept for the preparation of carbon based catalysts T2 - Carbon 2015 : innovation with carbon materials; the Annual World Conference on Carbon, Dresden, Germany, July 12 - 17, 2015 Y1 - 2015 SP - S. 294 PB - Deutsche Keramische Gesellschaft e.V. CY - Köln ER - TY - CHAP A1 - Beckmann, Jens A1 - Günther, David A1 - Schmidt, Peer A1 - Schöneich, Michael A1 - Klepel, Olaf T1 - Template assisted synthesis of porous carbon materials using porous concrete as a template T2 - 5th International Sypmosium on “Carbon on Catalysis”, Books of abstracts, Bressanone/Brixen, 2012 Y1 - 2012 ER - TY - CHAP A1 - Walter, Reni A1 - Günther, David A1 - Klepel, Olaf A1 - Niebrzydowska, Paula A1 - Wach, Anna A1 - Kuśtrowski, Piotr T1 - Carbon catalysts obtained by template assisted routes for oxidative dehydrogenation of ethylbenzene T2 - Annual World Conference on Carbon : (Carbon 2012) Krakow, Poland 17-22 June 2012 Y1 - 2012 SN - 978-1-62993-436-5 VL - 1 PB - Curran CY - Red Hook, NY ER - TY - CHAP A1 - Walter, Reni A1 - Günther, David A1 - Klepel, Olaf A1 - Schilling, Thorsten A1 - Erler, Thomas A1 - Bron, Michael T1 - Carbon catalysts prepared by template assisted routes for electrochemical oxygen reduction T2 - Annual World Conference on Carbon : (Carbon 2012) Krakow, Poland 17-22 June 2012 Y1 - 2012 SN - 978-1-62993-436-5 VL - 1 SP - 853 PB - Curran CY - Red Hook, NY ER - TY - CHAP A1 - Beckmann, Jens A1 - Günther, David A1 - Klepel, Olaf A1 - Schmidt, Peer T1 - Porous concrete as a template for the synthesis of porous carbon materials T2 - Annual World Conference on Carbon : (Carbon 2012) Krakow, Poland 17-22 June 2012 Y1 - 2012 SN - 978-1-62993-436-5 SP - 854 PB - Curran CY - Red Hook, NY ER - TY - CHAP A1 - Taubert, Michael A1 - Beckmann, Jens A1 - Zimmermann, Jörg A1 - Lange, Andreas A1 - Enke, Dirk A1 - Klepel, Olaf T1 - Carbon monoliths obtained from porous concrete as a template T2 - Porous systems: from novel materials to sustainable solutions : 6th FEZA conference : 8 - 11 September 2014, Universität Leipzig, Germany ; book of abstracts Y1 - 2014 SP - S. 269 PB - DECHEMA CY - Frankfurt am Main ER - TY - CHAP A1 - Utgenannt, Stephan A1 - Vormelchert, Carolin A1 - Klepel, Olaf A1 - Jarczewski, Sebastian A1 - Drozdek, Michal A1 - Kustrowski, Piotr A1 - Erler, Thomas A1 - Rümmler, Stephan A1 - Bron, Michael T1 - Template assisted synthesis of porous carbon catalysts with systematically varied properties T2 - The zeolites : materials with engineered properties : book of abstracts / 7th FEZA Conference, July 3-7, 2017, Sofia, Bulgaria Y1 - 2017 SP - S. 199 CY - Sofia ER - TY - CHAP A1 - Bölte, Jens-Henning Ingo Holger A1 - Utgenannt, Stephan A1 - Klepel, Olaf A1 - Erler, Thomas A1 - Rümmler, Stephan A1 - Bron, Michael T1 - Heteroatom doped porous carbon catalysts with systematically varied properties obtained by template assisted synthesis T2 - Book of abstracts, 8th International Symposium on Carbon for Catalysis, CarboCat–VIII, 26. – 29.06. 2018, Porto Y1 - 2018 UR - http://carbocatviii.eventos.chemistry.pt/images/abstract_book.pdf SN - 978-989-8124-22-7 SP - S. 69 PB - Sociedade Portuguesa de Química CY - Porto ER - TY - GEN A1 - Klepel, Olaf A1 - Danneberg, Nina T1 - Porous Carbon Monoliths Made from Cellulose and Starch T2 - C – Journal of Carbon Research Y1 - 2020 U6 - https://doi.org/10.3390/c6020032 SN - 2311-5629 VL - 6 IS - 2 SP - 11 ER - TY - CHAP A1 - Klepel, Olaf ED - Witzlack-Makarevich, Kai ED - Wulff, Nadja ED - Storz, Coretta T1 - Ha ho he wir hassen den BFC! oder die Mauer muss weg! T2 - Sushi, Sandmann, Sozialismus: Kultur- und Landeskunde der DDR : Ein Text- und Übungsbuch für den DaF-Unterricht Y1 - 2020 SN - 978-3-7329-0686-4 SN - 978-3-7329-9304-8 SP - 212 EP - 214 PB - Frank & Timme Verlag für wissenschaftliche Literatur CY - Berlin ET - 1. Auflage ER - TY - GEN A1 - González-Castaño, Miriam A1 - Navarro de Miguel, Juan Carlos A1 - Sinha, F. A1 - Ghomsi Wabo, Samuel A1 - Klepel, Olaf A1 - Arellano-García, Harvey T1 - Cu supported Fe-SiO2 nanocomposites for reverse water gas shift reaction T2 - Journal of CO2 Utilization N2 - This work analyses the catalytic activity displayed by Cu/SiO2, Cu-Fe/SiO2 and Cu/FSN (Fe-SiO2 nanocomposite) catalysts for the Reverse Water Gas Shift reaction. Compared to Cu/SiO2 catalyst, the presence of Fe resulted on higher CO’s selectivity and boosted resistances against the constitution of the deactivation carbonaceous species. Regarding the catalytic performance however, the extent of improvement attained through incorporation Fe species strongly relied on the catalysts’ configuration. At 30 L/gh and H2:CO2 ratios = 3, the performance of the catalysts’ series increased according to the sequence: Cu/SiO2 < Cu-Fe/SiO2 << Cu/FSN. The remarkable catalytic enhancements provided by Fe-SiO2 nanocomposites under different RWGS reaction atmospheres were associated to enhanced catalyst surface basicity’s and stronger Cu-support interactions. The catalytic promotion achieved by Fe-SiO2 nanocomposites argue an optimistic prospective for nanocomposite catalysts within future CO2-valorising technologies. KW - Cu catalysts KW - Fe-doped silica KW - Nanocomposites KW - Reverse water gas shift reaction Y1 - 2021 U6 - https://doi.org/10.1016/j.jcou.2021.101493 SN - 2212-9820 VL - 46 ER - TY - GEN A1 - Ghomsi Wabo, Samuel A1 - Klepel, Olaf T1 - Nitrogen release and pore formation through KOH activation of nitrogen‑doped carbon materials: an evaluation of the literature T2 - Carbon Letters Y1 - 2021 U6 - https://doi.org/10.1007/s42823-021-00252-3 SN - 2233-4998 SN - 1976-4251 ER - TY - GEN A1 - Klepel, Olaf A1 - Utgenannt, Stephan A1 - Vormelchert, Carolin A1 - König, Mark A1 - Meißner, André A1 - Hansen, Felix A1 - Bölte, Jens-Henning Ingo Holger A1 - Sieber, Tim A1 - Heinemann, Robert A1 - Bron, Michael A1 - Rokicinska, Anna A1 - Jarczewski, Sebastian A1 - Kustrowski, Piotr T1 - Redox catalysts based on amorphous porous carbons T2 - Microporous Mesoporous Materials Y1 - 2021 U6 - https://doi.org/10.1016/j.micromeso.2021.111257 SN - 1387-1811 VL - 323 ER - TY - GEN A1 - Gonzalez-Castano, Miriam A1 - Navarro de Miguel, Juan Carlos A1 - Boelte, Jens-H. A1 - Centeno, Miguel Angel A1 - Klepel, Olaf A1 - Arellano-García, Harvey T1 - Assessing the impact of textural properties in Ni–Fe catalysts for CO2 methanation performance T2 - Microporous and Mesoporous Materials N2 - In heterogeneous catalysis, the benefits of employing adequate textural properties on the catalytic performances are usually stated. Nevertheless, the quantification of the extent of improvement is not an easy task since variations on the catalysts’ specific areas and pore structures might involve modifications on a number of other surface catalytic features. This study establishes the impact of the catalyst textural properties on the CO2 methanation performance by investigating bimetallic Ni–Fe catalysts supported over carbon supports with different textural properties regarding surface area and pore structure. The comparable metal loading and dispersions attained for all systems enabled establishing forthright relationships between the catalyst textural properties and CO2 methanation rate. Once the influence of the external mass diffusions on the catalysts’ performance was experimentally discarded, the estimated Thiele modulus and internal effectiveness (φ and ηEff) values showed that the catalyst performance was majorly governed by the surface reaction rate whilst the pore size affected in no significant manner within the examined range (Dpore = 10.2 to 5.8 nm). Therefore, the rapport between the catalyst performance and surface area was quantified for the CO2 methanation reaction over Ni–Fe catalysts: increasing the surface area from 572 to 802 m2/g permit obtaining ca. 10% higher CO2 conversions. KW - Ni-Fe catalysts KW - CO2 methanation KW - Surface area KW - Pore size KW - Thiele modulus Y1 - 2021 U6 - https://doi.org/10.1016/j.micromeso.2021.111405 SN - 1387-1811 VL - 327 ER - TY - GEN A1 - Plattfaut, Julia A1 - Suckow, Matthias A1 - Klepel, Olaf A1 - Erlitz, Marcel A1 - Arellano-García, Harvey T1 - Modellierung und Simulation der templatgestützten Synthese von porösen Kohlenstoffgerüsten mittels COMSOL Multiphysics T2 - Chemie Ingenieur Technik N2 - Mithilfe einer templatgestützten Synthese wurden poröse Kohlenstoffgerüste unter Verwendung von Silicagel als Templat hergestellt. Die chemische Gasphaseninfiltration (CVI) wurde hierbei als Synthese verwendet. Unter Variation verschiedener Reaktionsparameter zur Optimierung der Kohlenstoffabscheidung wurde dieser Prozess mathematisch modelliert and simuliert. Dabei konnten die experimentellen Ergebnisse gut mit den Modellen nachgebildet werden. Die zusätzliche Beschreibung der laminaren Strömung verbessert die Übereinstimmung deutlich. Y1 - 2023 U6 - https://doi.org/10.1002/cite.202300014 SN - 1522-2640 VL - 96(2024) IS - 3 SP - 318 EP - 328 ER - TY - GEN A1 - Gonzalez-Castãno, Miriam A1 - Morales, Carlos A1 - Navarro de Miguel, Juan Carlos A1 - Boelte, Jens-H. A1 - Klepel, Olaf A1 - Flege, Jan Ingo A1 - Arellano-García, Harvey T1 - Are Ni/ and Ni5Fe1/biochar catalysts suitable for synthetic natural gas production? A comparison with γ-Al2O3 supported catalysts T2 - Green Energy & Environment N2 - Among challenges implicit in the transition to the post–fossil fuel energetic model, the finite amount of resources available for the technological implementation of CO2 revalorizing processes arises as a central issue. The development of fully renewable catalytic systems with easier metal recovery strategies would promote the viability and sustainability of synthetic natural gas production circular routes. Taking Ni and NiFe catalysts supported over γ-Al2O3 oxide as reference materials, this work evaluates the potentiality of Ni and NiFe supported biochar catalysts for CO2 methanation. The development of competitive biochar catalysts was found dependent on the creation of basic sites on the catalyst surface. Displaying lower Turn Over Frequencies than Ni/Al catalyst, the absence of basic sites achieved over Ni/C catalyst was related to the depleted catalyst performances. For NiFe catalysts, analogous Ni5Fe1 alloys were constituted over both alumina and biochar supports. The highest specific activity of the catalyst series, exhibited by the NiFe/C catalyst, was related to the development of surface basic sites along with weaker NiFe–C interactions, which resulted in increased Ni0:NiO surface populations under reaction conditions. In summary, the present work establishes biochar supports as a competitive material to consider within the future low-carbon energetic panorama. KW - Biochar catalysts KW - Carbon catalysts KW - Ni catalysts KW - NiFe alloy KW - Bimetallic catalysts KW - Synthetic natural gas KW - CO2 methanation Y1 - 2023 U6 - https://doi.org/10.1016/j.gee.2021.05.007 SN - 2468-0257 VL - 8 IS - 3 SP - 744 EP - 756 ER - TY - GEN A1 - Bölte, Jens-Henning A1 - Utgenannt, Stephan A1 - Schmidt, Max A1 - Klepel, Olaf A1 - Bron, Michael A1 - Rokicińska, Anna A1 - Jarczewski, Sebastian A1 - Kuśtrowski, Piotr T1 - S-doped and N+S-co-doped carbon catalysts in redox reactions T2 - Microporous and mesoporous materials N2 - In this contribution, the effects of heteroatom doping of porous carbon materials with S and N on their ability to catalyze redox-reactions involving the activation of molecular oxygen were investigated. For this purpose, a library of in total 54 undoped, S-doped and N + S-co-doped porous carbons was obtained via a template-based synthesis procedure using mesoporous silica gel as the template. To understand the influence of S on the properties of the doped carbons three different S-containing precursors, namely dimethyl sulfoxide (DMSO), p-toluene sulfonic acid and thiophene, were used. In order to investigate possible synergistic effects of S- and N-co-doping, urea was employed as the sole N-containing precursor. The obtained carbon catalysts were characterized by selected methods such as N2-physisorption at 77 K, X-ray diffraction (XRD), Raman spectroscopy, elemental analysis and X-ray photoelectron spectroscopy (XPS). Each carbon catalyst was tested in the oxidation of sulfurous acid (OSA) to sulfuric acid, the electrochemical oxygen reduction (ORR) and the oxidative dehydrogenation (ODH) of ethylbenzene. Owing to the similar textural and structural properties achieved through template-based synthesis of the carbon catalyst library, the results of the catalytic redox-reactions could directly be related to the respective heteroatom dopant. The observed trends indicate that in these redox-reactions S-species behave somewhat similar to O-species bound on the carbon surface. Furthermore, it can be shown that N + S co-doping rather combines the positive and negative effects of the individual dopants on the activity, than creating a synergistic effect that surpasses the individual contribution. KW - Porous carbon KW - Heteroatom-doping KW - Redox-reactions KW - Catalysis KW - Oxidation of sulfurous acid KW - Oxygen reduction reaction KW - Oxidative dehydrogenation of ethylbenzene Y1 - 2026 U6 - https://doi.org/10.1016/j.micromeso.2026.114129 SN - 1873-3093 VL - 407 SP - 1 EP - 11 PB - Elsevier BV CY - Amsterdam ER -