CZX catalysts with different metal oxides to replace Al2O3 as carrier are synthesized via co-precipitation method,while CZAlX catalysts modified by different metal oxides as additives are prepared via impregnation method.All catalysts prepared are characterized by means of powder X-ray diffraction(XRD)and scanning electron microscopy(SEM),and applied in CO2 hydrogenation tests at different temperature in a fixed bed reactor.Influences of alkali earth metal Mg,transition metal Zr,rare earth metals Y and Ce as oxide carriers or modifiers on the surface structure and catalytic performance of CZAl catalysts are studied.Results show that CZX catalysts show stronger catalytic performance for methanol production.Among them,CZZr catalyst with ZrO2 as the carrier shows the strongest catalytic activity,over which methanol yield is up to 14.50％,the corresponding methanol selectivity reaches 41.41％,and CO2 conversion rate reaches 35.01％.CZAlX catalysts show stronger catalytic performance for CO production.Among them,CZAlMg catalyst with Mg as additive shows the strongest catalytic activity.Over CZAlMg catalyst,CO yield can reach 35.87％,the corresponding CO selectivity is 84.75％,and CO2 conversion rate reaches 42.32％.
关键词
CO2加氢/甲醇/CO/铜锌铝催化剂/改性
Key words
CO2 hydrogenation/methanol/CO/Cu-ZnO-Al2O3 catalyst/modification
万方数据