Research on performance of Cu-based catalyst for CO_2 hydrogenation to methanol
Three Cu-based catalysts are prepared by coprecipitation,polyethylene glycol(PEG)-assisted precipitation and PEG-assisted precipitation-impregnation methods,respectively,and evaluated in CO2 hydrogenation to methanol in fixed bed reactor.Effects of heating treatment of catalysts in situ,reaction temperatures and run time on catalytic performances are investigated,and the related characterizations are also carried out.The results show that Cu-Zn-Al-La catalyst,prepared by PEG-assisted precipitation-impregnation method,displays better catalytic performance,thermal stability and catalytic stability due to higher Cu active specific surface area,which results from the assistance of PEG in the course of coprecipitation,and more suitable basic sites,which generated by introduction of La on the surface of Cu-Zn-Al catalyst.