Steam Reforming of Dimethyl Ether over Cu/ZnO/ZrO₂ and γ-Al₂O₃ Mixed Catalyst Prepared by Extrusion

Abstract

Steam reforming of dimethyl ether, DME, over Cu/ZnO/ZrO2 and γ-Al2O3 mixed catalysts prepared by the extrusion technique was investigated. The catalysts were characterized by BET, pore-size distribution measure ments, N2O chemisorption, powder X-ray diffraction, and SEM-EDX analysis. The effect of reaction tempera ture on catalyst life time was investigated. Steam reforming of DME over the extruded catalyst proceeded above 623 K. The major reaction products were H2 and CO2 with relatively small amounts of CO and CH4. DME steam reforming was not restricted by the equilibrium limitation of DME hydration to CH3OH, suggesting that CH3OH produced was subsequently reformed into H2 and CO2 over the catalyst. The catalyst suffered from thermal deactivation at higher temperatures; mainly caused by a reduction in Cu dispersion in the Cu/ZnO/ZrO2 catalyst. Incorporation of ZrO2 into Cu/ZnO may stabilize Cu dispersion and increase the stability of the extruded catalyst for long-term operation.

Hydrogenation of Dimethyl Oxalate Using Extruded Cu/SiO2 Catalysts: Mechanical Strength and Catalytic Performance

“…From an industrial point of view, Cu/SiO 2 powdered catalysts should be shaped into assemblies such as granules, spheres, and extrudates in order to decrease the pressure drop and achieve a desirable mechanical strength. , Extrusion is the most important shaping technique applied in the manufacturing of fixed-bed catalysts. In general, an extruded material is manufactured from a paste, which is first obtained by blending the catalyst powder with a binder to provide the mechanical strength and a liquid phase to provide effective lubrication during the extrusion. , Molding catalysts are normally agglomerates of mixed metal oxides, or supported metal, metal oxides, and sulfide with special binders. − In recent years, the extrusion of zeolites is also applied. − …”