Study on modification of CO2 hydrogenation to methanol with GaZrOx catalyst
A series of Gay Zr1-y O,(y=0.2,0.3,0.4,0.5)catalysts with different Ga-Zr ratios(Ga/Zr=2/8,3/7,4/6,5/5)were prepared by co-current coprecipitation method.The effect of Ga doping ratio on catalyst performance was investigated,and the optimal Ga/Zr ratio was obtained.The crystal phase,specific surface ar-ea,pore volume,pore size and weight loss of GayZr1-y Ox catalyst materials were studied by XRD,N2 physical adsorption,ICP-OES and TG.XPS,CO2-TPD,H2-TPD and H2-TPR were used to investigate the surface elec-tronic structure,acid-alkalinity,reducibility and H2 and CO2 adsorbability of the materials,and to reveal the relationship between the structure and properties of the materials.The results show that the specific surface are-a and dispersion of GayZr1-yO,catalyst increase significantly with the increase of Ga doping ratio.The adsorp-tion capacity of H2/CO2 and the number of moderately alkaline sites increased significantly.The surface oxygen vacancy content increases and the interaction between Ga and Zr is enhanced.Appropriate Ga content can im-prove the catalytic performance of GayZr1-yOxcatalyst.When Ga/Zr=4/6,at the condition of 280 ℃,3 MPa,H2/CO2=3/1,the maximum methanol yield reached 4.95 mmol/(h·gcat).
CO2 hydrogenationmethanolco-current coprecipitation methoddoping ratiomodification study
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