Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9610308 | Catalysis Today | 2005 | 6 Pages |
Abstract
Synthesis of dimethyl ether (DME) has been studied in a single reaction step, from H2 + CO and H2 + CO2, in a fixed bed reactor on CuO-ZnO-Al2O3/γ-Al2O3 and CuO-ZnO-Al2O3/NaHZSM-5 hybrid catalysts. It has been proven that water content in the reaction medium (which is higher when CO2 is fed) contributes to efficiently decreasing deactivation by coke in both catalysts and, consequently, when water is in the feed deactivation is insignificant for 30 h reaction. Nevertheless, water also decreases the activity of γ-Al2O3 acid function, due to its high adsorption capacity on the acid sites. Due to its importance in the viability of the industrial process, a study has been carried on the regeneration of both catalysts by coke combustion under controlled conditions (in order to avoid CuO sintering). For this study, the catalysts have been used under severe deactivation conditions. It has been proven that γ-Al2O3 does not have a suitable hydrothermal stability and that CuO-ZnO-Al2O3/NaHZSM-5 catalyst has an excellent performance and is suitable for using it in uninterrupted reaction-regeneration cycles.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Andrés T. Aguayo, Javier Ereña, Irene Sierra, Martin Olazar, Javier Bilbao,