HYDROGENATION OF CARBON-DIOXIDE OVER COPPER-PYROCHLORE ZEOLITE COMPOSITE CATALYSTS/

The hydrogenation of CO2 was studied over composite catalysts obtained by mixing Cu-based methanol synthesis catalyst and HY zeolite. A mech anism associating methanol synthesis and MTG (methanol to gasoline) re action allowed the formation of C-1-C-4 hydrocarbons. It was found tha t the catalytic behaviors of the composite catalysts were favorably in fluenced by the characteristics of the methanol synthesis catalysts. T he Cu-La2Zr2O7 catalyst we recently developed associated with HY zeoli te exhibited interesting performances in hydrocarbon synthesis. The ad dition of ZrO2 to Cu-La2Zr2O7/HY enhanced the ability to produce hydro carbons. Comparing composite catalyst systems prepared with different Cu-based methanol synthesis catalysts, the effect of Na contamination on methanol and hydrocarbon formation over composite catalysts were al so discussed.