Influence of different precipitants on the properties of Cu-ZnO-ZrO2 catalyst for methanol synthesis through CO2 hydrogenation
Cu-ZnO-ZrO2 (molar ratio CuO ∶ ZnO ∶ ZrO2=5 ∶ 4 ∶ 1) catalysts were prepared using different precipitants (NH3·H2O、NaHCO3、Na2CO3) by concurrent-flow co-precipitation method.XRD,XPS,H2-TPR and CO2-TPD were used to characterize the physico-chemical properties of the catalysts,and the catalysts activity were evaluated in a high temperature and high pressure micro-reactor.The influences of different precipitants on the catalyst precursors and catalysts component structure,CuO-ZnO interaction for methanol synthesis through carbon dioxide hydrogenation were studied.Results show that the influence of different precipitants on the physico-chemical properties and activity of catalysts was very great.When the precipitants of NaHCO3 and Na2CO3 were used,they was helpful to produce aurichalcites in catalyst precursors,which,after calcination,were effective to prevent the growth of CuO particles,and to improve the dispersion of the metal copper oxide,increase the metal surface basic sites,enhance CuO-ZnO interaction,and raise the catalysts activity.More aurichalcites were produced in the catalyst precursors by using NaHCO3 as the precipitant,and the particle size of the CuO was 8.6nm,the copper specific surface area was 15.38m2/g,the dispersion degree of copper was 11.9％,the selectivity of methanol was 42.29％,the yield of methanol was 0.094g/(gcat·h),and the catalyst activity was the highest.
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