Study on structure regulation of CuZnAl-LDHs and their catalytic synthesis of low-carbon alcohols from syngas
To address the issue of low dispersion of Cu species in Cu-based catalysts used in the synthesis of low-carbon alcohols from syngas,the structures of[Cu(EDTA)]2-intercalated ZnAl hydrotalcite-like catalysts were successfully adjusted by four intercalation methods,including coprecipitation,ion exchange,calcination recovery,and reprecipitation methods.The catalyst structures were characterized by XRD,N2 physical adsorption/desorption,TEM,H2-TPR,XPS and so on,and the catalytic performances of catalysts in CO hydrogenation to low-carbon alcohols were also investigated.The results show that the Cu dispersities,Cu specific surface areas and the relative contents of oxygen vacancy are regulated by the intercalation methods,thereby affecting their catalytic performances.The catalyst prepared by calcination recovery method exhibites the highest Cu dispersity,the largest Cu specific surface area and the highest oxygen vacancy concentration.Moreover,the interaction between Cu species and ZnO on the layered is strong.This catalyst exhibites the best catalytic performance under reaction conditions of temperature 280 ℃,pressure 4.0 MPa,gas hourly space velocity 2000 h-1 and V(H2)∶V(CO)=1∶1,and the total alcohol space-time yield achieves 17468.7 mg/(g·h).
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