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采用MS -TPSR和MS -TPD技术在不同粒度的超细Cu -ZnO -ZrO2 催化剂上考查了CO2 和CO加氢合成甲醇的反应过程和吸附活化特征。研究表明 ,CO2 和CO都可以直接加氢合成甲醇。在CO2 +H2 反应过程中 ,CO2是合成甲醇的主要碳源 ,但是在CO +H2 反应过程中 ,不但CO可以直接加氢合成甲醇 ,CO2 也可以通过水汽变换反应而参与甲醇的合成 ,因此也是CO加氢合成甲醇的碳源之一。催化剂的粒度大小直接影响反应活性 ,催化剂粒度越小 ,甲醇的收率越高 ;粒度大小还与CO的吸附活化状态有关 ,从而影响CO加氢合成甲醇的反应机理 ,当催化剂粒度很小时 ,CO倾向于通过水汽变换反应生成CO2 ,再由CO2 加氢合成甲醇 ,当催化剂颗粒较大时 ,CO易于直接加氢合成甲醇。
MS-TPSR and MS-TPD techniques were used to investigate the reaction process and the adsorption activation characteristics of CO2 and CO hydrogenation of methanol over ultrafine Cu-ZnO-ZrO2 catalysts with different particle sizes. Studies have shown that CO2 and CO can be directly hydrogenation of methanol synthesis. In the process of CO2 + H2 reaction, CO2 is the main carbon source for the synthesis of methanol. However, during the CO + H2 reaction, not only CO can be directly hydrogenated to synthesize methanol, but also CO2 can be involved in the synthesis of methanol through the water vapor shift reaction, One of the carbon sources for CO hydrogenation to methanol. The particle size of the catalyst directly affects the reactivity. The smaller the particle size of the catalyst, the higher the yield of methanol. The size of the particle is also related to the activation state of CO, which affects the reaction mechanism of methanol synthesis by CO hydrogenation. When the catalyst particle size is small, It tends to generate CO2 through water vapor shift reaction and then hydrogenation of CO2 to synthesize methanol. When the catalyst particles are large, CO can be easily hydrogenated to synthesize methanol directly.