Abstract
In this paper an evaluation is given of the uses of porous ceramic membranes in high-temperature applications, on the basis of the results achieved in recent past years in our laboratory, in some cases combined with data from the literature. The high- temperature (>300°C) reactor applications of unmodified and silver- modified γ-alumina catalytically active membranes have been studied in relation to the (oxidative) dehydrogenation of methanol, while those of vanadia- modified titania catalytically active membranes have been studied in relation to the de-NOx reaction. Catalytically active membrane reactors appeared to be well controllable devices and able to regulate the supply of the reactants to the reaction zone which is the membrane layer itself. Membrane reactors incorporating unmodified γ-alumina passive (separative) membranes have been used in combination with commercial catalysts to enhance the equilibrium conversion of n-butane or of methanol dehydrogenation by separating the hydrogen product. The equilibrium conversions have been shifted by a factor of 2, accompanied by improved selectivities. The selection of the chemical and structural characteristics of the membrane layers, as well as of the process parameters of the membrane reactor, is strongly dependent on the function of the membrane and determines the performance of the membrane reactor during the process, as discussed in this contribution.
Original language | English |
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Title of host publication | Key Engineering Materials |
Pages | 359-364 |
Number of pages | 6 |
Volume | 61-62 |
Publication status | Published - 1991 |
Externally published | Yes |
Event | Proceedings of the 2nd International Conference on Inorganic Membranes - ICIM2-91 - Montpellier, Fr Duration: 1 Jul 1991 → 4 Jul 1991 |
Conference
Conference | Proceedings of the 2nd International Conference on Inorganic Membranes - ICIM2-91 |
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City | Montpellier, Fr |
Period | 1/07/91 → 4/07/91 |