Cu/ZnO/C-N催化剂上Cu-ZnO界面加速CO2加氢制甲醇
门小勇 , 魏新煜 , 李荣 , 宋旭东 , 王波 , 苏暐光
现代化工 ›› 2026, Vol. 46 ›› Issue (9) : 188 -193.
Cu/ZnO/C-N催化剂上Cu-ZnO界面加速CO2加氢制甲醇
Cu-ZnO interface accelerates CO2 hydrogenation to methanol over Cu/ZnO/C—N catalyst
首先合成了N掺杂碳材料C-N,然后采用共沉淀法制备了Cu/ZnO/C-N复合催化剂,并将其用于CO2加氢制甲醇反应。添加C-N可以通过部分抑制CO和CH4的产生,显著促进Cu/ZnO上甲醇的生成。当反应温度为280℃时,CO2转化率从11.8%提高到13.5%,甲醇选择性从55.2%增加到63.1%。C-N不仅同时促进了Cu物种和ZnO的分散,有助于更多Cu-ZnO界面位点的形成,而且C-N还加强了Cu物种与载体ZnO间的相互作用,大幅度促进Cu-ZnO界面处与ZnO强相互作用的Cu+物种的形成。该界面处的Cu+物种经还原后形成的Cu0物种可以显著提高中等强度的H2和CO2吸附量并提升活化能力,大大促进和加快甲醇的生成活性。Cu-ZnO界面处与ZnO强相互作用的Cu0物种可能是CO2加氢制甲醇的活性中心,Cu/ZnO/C-N是一个潜在的优秀甲醇合成催化剂。
N-doped carbon material C—N was first synthesized,Cu/ZnO/C—N composite catalyst was prepared by a co-precipitation method and applied to CO2 hydrogenation to methanol.The addition of C—N could significantly promote the generation of methanol on Cu/ZnO by partially inhibiting the production of CO and CH4.When the reaction temperature was 280℃,CO2 conversion increased from 11.8% to 13.5%,and methanol selectivity rose from 55.2% to 63.1%.C—N not only simultaneously promoted the dispersion of Cu species and ZnO,facilitating the formation of more Cu-ZnO interface sites,but also enhanced the interaction between Cu species and ZnO,significantly promoting the formation of Cu+ species with strong interaction with ZnO at the Cu-ZnO interface.Cu0 species formed by the reduction of Cu+ species at Cu-ZnO interface could significantly increase the adsorption and activation capacity of medium-intensity H2 and CO2,greatly promoting and accelerating the generation activity of methanol.Cu0 species with strong interaction with ZnO at the Cu-ZnO interface may be the active center for CO2 hydrogenation to methanol,and Cu/ZnO/C—N is a potential excellent catalyst for methanol synthesis.
CO2加氢制甲醇 / Cu/ZnO / C-N / Cu-ZnO界面 / Cu0物种
CO2 hydrogenation to methanol / Cu/ZnO / C—N / Cu-ZnO interface / Cu0 species
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