Effect of grain size of ZnZrO2 on preparation of low carbon olefin by CO2 hydrogenation
[Objective]In order to realize the effective use of CO2 and reduce the dependence of chemical enterprises on petrochemical industry,the structural effects of metal oxides were explored to design metal catalysts with more structural stability and better catalytic performance.[Method]First,ZnZrO2 metal catalyst and SAPO-34 molecular sieve were prepared by the coprecipitation method and the hydrothermal method respectively,and the catalysts were characterized and analyzed by means of characterization;second,by setting different calcination temperatures,the grain size of ZnZrO2 was changed,which,together with SAPO-34,formeda bifunction catalyst for CO2 hydrogenation reaction;finally,the effect of grain size of metal catalyst on CO2 hydrogenation reaction was studied,exploring various factors affecting CO2 hydrogenation reaction.[Result]With the increase of roasting temperature,the grain size of ZnZrO2 gradually increases from 10.0 nm to 22.2 nm,and specific surface area,acid content,CO2 adsorption capacity and selectivity of the target product low carbon olefin show a volcanic trend,increasing first and then decreasing.This proves that the grain size of metal oxides can be controlled by changing the roasting temperature.[Conclusion]The results of this study provide basic theoretical data for studying the effect of catalyst grain size on CO2 hydrogenation reaction in bifunctional catalysts.
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