TY - JOUR A1 - Jänchen, Jochen A1 - Stach, Helmut T1 - Adsorption properties of porous materials for solar thermal energy storage and heat pump applications JF - Energy Procedia N2 - The water adsorption properties of modified porous sorbents for solar thermal energy storage and heat transformation have been investigated by thermogravimetry (TG) differential thermogravimetry (DTG), microcalorimetry, measurements of water adsorption isotherms, and storage tests. A chabazite type SAPO, a dealuminated faujasite type zeolite, and a mesostructured aluminosilicate, have been synthesized and compared with common zeolites X, Y and silica gel. It has been found that optimized lattice composition and pore architecture contribute to well adapt hydrophilic properties and a beneficial steep isotherm. KW - water adsorption KW - thermal adsorption storage KW - molecular sieve KW - SAPO-34 KW - MCM-41 Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-6160 SN - 1876-6102 VL - 30 IS - 2012 SP - 289 EP - 293 ER - TY - JOUR A1 - Herzog, Thomas H. A1 - Jänchen, Jochen A1 - Kontogeorgopoulos, Eythymius M. A1 - Lutz, Wolfgang T1 - Steamed Zeolites for Heat Pump Applications and Solar Driven Thermal Adsorption Storage JF - Energy Procedia N2 - The influence of the dealumination degree of NaY with respect to the water adsorption properties was investigated by infrared spectroscopy, thermogravimetry and isotherm measurements. The modification of the samples is a result of a steaming process at different temperatures in dependence of time. It was found that dealumination controls the hydrophilic behavior of NaY and contributes to defined low desorption temperatures. Similar to microporous SAPO's steamed Y-zeolites can be used for low temperature applications of heat transformation and thermal adsorption storage. KW - dealumination KW - water adsorption KW - zeolite KW - adsorption heat pump KW - thermal adsorption storage Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-5951 SN - 1876-6102 VL - 48 SP - 380 EP - 383 ER - TY - JOUR A1 - Herzog, Thomas H. A1 - Jänchen, Jochen T1 - Adsorption Properties of Modified Zeolites for Operating Range Enhancement of Adsorption Heat Pumps through the Use of Organic Adsorptive Agents JF - Energy Procedia N2 - Faujasite zeolites with the highest possible Al-content and different cations as well as a dealuminated zeolite Y have been chosen to study the impact on the adsorption behavior in view of differed adsorptive agents for heat pumps or thermochemical storages. Our results show advantages and disadvantages for water, methanol or ethanol adsorption due to the structure of the anion skeleton, kind of cations and size of the adsorbat molecule. KW - heat pump KW - water adsorption KW - zeolite KW - ethanol KW - methanol Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-6614 SN - 1876-6102 VL - 91 SP - 155 EP - 160 ER -