Highly selective catalysts for methanol synthesis from CO₂ and H₂ are required for increasing the process efficiency that actually produces large amounts of CO. The understanding of the Cu–ZnO synergy allowed the possibility to design core–shell catalysts of the type Cu@ZnO _x with enhanced selectivity for methanol. This type of core–shell structure was synthesized with variable compositions and the catalytic efficiency as well as the physicochemical properties were scrutinized in order to build structure–reactivity relationships. Zn migration is responsible for the formation of the Cu _x Zn_{(1− x )}O _y active phase. The experimental results were compared with theoretical calculations based on a geometrical model taking into account the amount of Zn migrated. A direct correlation was found between theory and experiment. Finally, a linear correlation of catalyst activity versus Zn migrated is shown for three different catalyst designs, thus confirming that a high Zn migration is needed for obtaining an efficient methanol synthesis catalyst.

中文翻译：

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甲醇合成中的Cu-ZnO协同作用第3部分：实验研究和同心球模型解释了选择性Cu @ ZnOx核壳催化剂的组成对甲醇转化率的影响

需要使用高选择性的催化剂从CO ₂和H ₂合成甲醇，以提高实际产生大量CO的工艺效率。对Cu-ZnO协同作用的理解使得可以设计Cu @ ZnO类型的核壳催化剂_x具有增强的对甲醇的选择性。合成了这种具有可变组成的核-壳结构，并仔细研究了催化效率和理化性质，以建立结构-反应性关系。锌迁移是导致Cu _x Zn _{（1- x ）} O _{y形成的原因}活动阶段。将实验结果与考虑了锌迁移量的基于几何模型的理论计算进行了比较。在理论与实验之间发现了直接的相关性。最后，对于三种不同的催化剂设计，显示了催化剂活性与迁移的Zn的线性相关性，因此证实了要获得有效的甲醇合成催化剂需要高的Zn迁移。