@techreport{MetzStumpf2020, author = {Metz, Thomas and Stumpf, Arne}, title = {Nano-BHKW-Teststand - Untersuchungen zur Realisierbarkeit eines Blockheizkraftwerkes im Kleinstmaßstab auf Basis thermoelektrischer Generatoren f{\"u}r die Anwendung als stromproduzierende Heizung in Einfamilienh{\"a}usern}, series = {Vorlaufforschung / Schriftenreihe der Georg-Simon-Ohm-Hochschule, N{\"u}rnberg (2018)}, volume = {2018}, journal = {Vorlaufforschung / Schriftenreihe der Georg-Simon-Ohm-Hochschule, N{\"u}rnberg (2018)}, address = {N{\"u}rnberg}, issn = {1867-4585}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:92-opus4-34797}, pages = {76-85}, year = {2020}, abstract = {Mit Blockheizkraftwerken (BHKW) im Kleinstmaßstab (Nano-BHKW) k{\"o}nnen Besitzer von Einfamilienh{\"a}usern den Effizienzvorteil der Kraft-W{\"a}rme-Kopplung nutzen. Aktuelle Nano-BHKW-Systeme mit Gasmotor, Dampfmotor, Stirlingmotor oder Brennstoffzelle sind relativ kosten- und wartungsintensiv. Das Forschungsprojekt untersucht eine m{\"o}gliche Alternative zu den bisherigen Systemen: Ein Nano-BHKW auf Basis thermoelektrischer Generatoren (TEG). Im Rahmen des Projekts werden die Vorteile dieses Systems gegen{\"u}ber den bisher kommerziellen Systemen erforscht. Hierzu werden aktuell verf{\"u}gbare TEG eingesetzt und eine Versuchsanlage in kommerziellem Maßstab mit einer elektrischen Leistung von ca. 300 Wattel und einer Heizleistung von ca. 6 kWth errichtet. Dar{\"u}ber hinaus soll auch das Potenzial in Entwicklung befindlicher TEG-Materialien und Herstellungsmethoden f{\"u}r diese Anwendung auf theoretischer Basis gepr{\"u}ft werden. Die Versuchsanlage wird mit Propan als Brennstoff betrieben. Die zu erforschende Technik erm{\"o}glicht auch den Einsatz anderer Brennstoffe wie Erdgas, Biogas, Heiz{\"o}l oder Holzbrennstoffe. Bei positivem Projektergebnis strebt das Forschungsteam eine Entwicklung bis zur Marktreife in Kooperation mit der Industrie an.}, subject = {Blockheizkraftwerk}, language = {de} } @article{DongDuchesneMohanetal.2020, author = {Dong, Yuchan and Duchesne, Paul and Mohan, Abhinav and Ghuman, Kulbir Kaur and Kant, Paul and Hurtado, Lourdes and Ulmer, Ulrich and Loh, Joel Y. Y. and Tountas, Athanasios A. and Wang, Lu and Ali, Feysal M. and Xia, Meikun and Dittmeyer, Roland and Ozin, Geoffrey A.}, title = {Shining light on CO2: from materials discovery to photocatalyst, photoreactor and process engineering}, series = {Chemical Society Reviews}, volume = {49}, journal = {Chemical Society Reviews}, number = {16}, publisher = {Royal Society of Chemistry (RSC)}, issn = {0306-0012}, doi = {10.1039/D0CS00597E}, pages = {5648 -- 5663}, year = {2020}, abstract = {Heterogeneous catalysis, a process in which the reaction of gaseous or liquid chemical reagents is facilitated at the surface of a solid material, is responsible for the majority of industrial-scale chemical and fuel production reactions. The energy required to drive these reactions has historically been derived from the combustion of non-renewable fossil fuels and carries an unavoidably large carbon footprint. More recently, the development of environmentally responsible and sustainable chemical industries is increasingly motivated by greenhouse gas-induced climate change, thus creating demand for eco-friendly heterogeneous catalytic processes. This includes innovative approaches enabled by renewable forms of energy, such as the electrification of chemical and petrochemical processes, utilization of CO2 as a feedstock and the incorporation of light into catalytic reactions. Herein we review the conversion of solar energy to chemical energy using CO2, and describe how the photophysical and photochemical properties of nanostructured metal oxide photocatalysts have been engineered to efficiently incorporate light into heterogeneous gas-solid CO2 hydrogenation reactions. Realizing high photonic and energy efficiencies in these systems has demanded innovation in not only photocatalyst engineering, but also photoreactor and process engineering. Rather than exclusively providing an in-depth discussion of the chemistry and science within each individual study, this Tutorial Review highlights the multidisciplinary character of photocatalysis studies by covering the four essential components of a typical research work in this field (materials engineering, theoretical modelling, reactor engineering and process development) via case studies of the archetypal indium oxide catalyst materials. Through advances in these four components, progress has been made towards the ultimate goal of industrializing the production of CO2-derived chemicals and fuels.}, language = {en} } @article{MohanUlmerHurtadoetal.2020, author = {Mohan, Abhinav and Ulmer, Ulrich and Hurtado, Lourdes and Loh, Joel and Li, Young Feng and Tountas, Athanasios A. and Krevert, Carola and Chan, Chakyu and Liang, Yilei and Brodersen, Peter and Sain, Mohini M. and Ozin, Geoffrey A.}, title = {Hybrid Photo- and Thermal Catalyst System for Continuous CO2 Reduction}, series = {ACS Applied Materials \& Interfaces}, volume = {12}, journal = {ACS Applied Materials \& Interfaces}, number = {30}, publisher = {American Chemical Society (ACS)}, issn = {1944-8244}, doi = {10.1021/acsami.0c06232}, pages = {33613 -- 33620}, year = {2020}, abstract = {Heterogeneous thermal catalytic processes are vital for industrial production of fuels, fertilizers, and other chemicals necessary for sustaining human life. However, these processes are highly energy-intensive, requiring a vast consumption of fossil fuels. An emerging class of heterogeneous catalysts that are thermally driven but also exhibit a photochemically enhanced rate can potentially reduce process energy intensity by partially substituting conventional heat (where fossil fuels are needed) with solar energy. Such catalyst systems have yet to be practically utilized. Here, we demonstrate a compact electrically heated photo- and thermal annular reactor module to reduce CO2 to CO, via the reverse water gas shift reaction. A first-principles-based design approach was taken in developing a SiO2 on an Al photo- and thermal catalyst system for the model photo- and thermal indium oxide hydroxide (In2O3-x(OH)y) catalysts. A 5-fold light enhancement in the CO production rate and over 70 h of stable CO production were achieved. This represents the highest light enhancement effect reported for this model photocatalyst to date. The reactor presented herein allows continuous operation and a significant reduction of 31\% in heater power consumption when provided with an additional 2 suns of irradiation, demonstrating the strong photo- and thermal-harvesting performances of the catalyst system developed in this work.}, language = {en} } @article{GuoDuchesneWangetal.2020, author = {Guo, Jiuli and Duchesne, Paul N. and Wang, Lu and Song, Rui and Xia, Meikun and Ulmer, Ulrich and Sun, Wei and Dong, Yuchan and Loh, Joel Y. Y. and Kherani, Nazir P. and Du, Jimin and Zhu, Baolin and Huang, Weiping and Zhang, Shoumin and Ozin, Geoffrey A.}, title = {High-Performance, Scalable, and Low-Cost Copper Hydroxyapatite for Photothermal CO2 Reduction}, series = {ACS Catalysis}, volume = {10}, journal = {ACS Catalysis}, number = {22}, publisher = {American Chemical Society (ACS)}, issn = {2155-5435}, doi = {10.1021/acscatal.0c03806}, pages = {13668 -- 13681}, year = {2020}, language = {en} } @article{EisenlauerTeipel2020, author = {Eisenlauer, Moritz and Teipel, Ulrich}, title = {Comminution of Wood - Influence of Process Parameters}, series = {Chemical Engineering \& Technology}, volume = {43}, journal = {Chemical Engineering \& Technology}, number = {5}, publisher = {Wiley}, issn = {0930-7516}, doi = {10.1002/ceat.201900488}, pages = {838 -- 847}, year = {2020}, abstract = {An essential element for sustainable use of renewable resources is an efficient comminution process for which the relation between energy input and size reduction is of great importance. Fine comminution of beech, oak, and spruce wood chips in cutting and hammer mills at different moisture content levels is investigated. The influence of the different process parameters as well as the size reduction performed by the hammer and cutting mill on the specific comminution energy is reported and the particulate properties of the comminution products are reported. Considering the energy requirements, functional relations were derived from the experimental results, which describe the relation between comminution energy and size reduction.}, language = {en} } @article{Teipel2020, author = {Teipel, Ulrich}, title = {Aufbereitung von Sekund{\"a}rrohstoffen der Bau- und Keramikindustrie}, series = {Keramische Zeitschrift}, volume = {72}, journal = {Keramische Zeitschrift}, number = {3}, publisher = {Springer Science and Business Media LLC}, issn = {0023-0561}, doi = {10.1007/s42410-020-0130-3}, pages = {36 -- 42}, year = {2020}, language = {de} } @article{DreselTeipel2020, author = {Dresel, Alexander and Teipel, Ulrich}, title = {Jet Dispersion of Multiwall Carbon Nanotubes and Correlation with Suspension Rheology}, series = {Chemical Engineering \& Technology}, volume = {43}, journal = {Chemical Engineering \& Technology}, number = {5}, publisher = {Wiley}, issn = {0930-7516}, doi = {10.1002/ceat.201900534}, pages = {869 -- 878}, year = {2020}, abstract = {A novel jet dispersion technique was developed and investigated which enabled excellent carbon nanotube (CNT) dispersion by high exfoliation at even very low pressure drops. Suitable procedures were developed for the characterization of agglomerate size and fraction of individual CNTs. The appropriate characterization enabled the definition of a dimensionless dispersing parameter and the development of a kinetic model that describes CNT dispersion in dependence of the volumetric energy input. The rheological behavior of CNT suspensions in steady-shear flows was investigated and demonstrated how the agglomerate fracture and CNT individualization influence the suspension viscosity.}, language = {en} } @article{ChairopoulouKratzerGrossetal.2020, author = {Chairopoulou, Makrina A. and Kratzer, Fabian and Groß, Roland and Herrmann, Michael and Teipel, Ulrich}, title = {Influence of the Temperature on Coccolith-Containing Systems from Emiliania huxleyi Cultivations}, series = {Chemical Engineering \& Technology}, volume = {43}, journal = {Chemical Engineering \& Technology}, number = {5}, publisher = {Wiley}, issn = {0930-7516}, doi = {10.1002/ceat.201900507}, pages = {904 -- 912}, year = {2020}, abstract = {Thermogravimetric analysis of a coccolith-containing biogenic broth showed a three-step degradation process. According to this system behavior, the biogenic broth was heated to specific temperatures and characterized in terms of its morphology, surface chemistry, and crystallinity. The elemental and organic composition of the treated samples was also evaluated and compared to the reference material. The presented results were acquired in an effort to exploit pretreatment scenarios for such a biogenic system that would improve and support a separation process.}, language = {en} } @article{SeilerUrbanTeipel2020, author = {Seiler, Elisa and Urban, Helfried and Teipel, Ulrich}, title = {Mikrowellenpyrolyse von carbonfaserhaltigen Kunststoffen als Recyclingoption}, series = {Chemie Ingenieur Technik}, volume = {92}, journal = {Chemie Ingenieur Technik}, number = {4}, publisher = {Wiley}, issn = {0009-286X}, doi = {10.1002/cite.201900133}, pages = {469 -- 475}, year = {2020}, abstract = {Herausforderungen bei der Etablierung einer Circular Economy von carbonfaservert{\"a}rkten Kunststoffen (CFK) ergeben sich insbesondere durch die n{\"o}tige, jedoch problematische Trennung des Faser-Matrix-Verbunds. Das Pyrolyseverfahren stellt eine m{\"o}gliche, bereits industriell umgesetzte, Technologie zur Verbundtrennung dar. Eine Weiterentwicklung ist die mikrowellenunterst{\"u}tze Pyrolyse, bei der das CFK-Material durch die Mikrowellen aufgeheizt und so die Faser freigelegt wird. Prozessgrundlagen und Einfl{\"u}sse auf die Faser-Matrix-Trennung werden im vorliegenden Beitrag betrachtet.}, language = {de} } @incollection{WeersWollmannTeipeletal.2020, author = {Weers, Martin and Wollmann, Annett and Teipel, Ulrich and Weber, Alfred P.}, title = {Dynamics of Separation Characteristics of Sieving and Flow Classification Processes}, series = {Dynamic Flowsheet Simulation of Solids Processes}, booktitle = {Dynamic Flowsheet Simulation of Solids Processes}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {9783030451677}, doi = {10.1007/978-3-030-45168-4_10}, pages = {349 -- 390}, year = {2020}, language = {en} }