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CuO/ZnO/Al2O3 Catalyst Prepared by Mechanical-Force-Driven Solid-State Ion Exchange and Its Excellent Catalytic Activity under Internal Cooling Condition
- Wu, Wangyang, Xie, Kai, Sun, Dalin, Li, Xiaohong, Fang, Fang
- Industrial & engineering chemistry process design and development 2017 v.56 no.29 pp. 8216-8223
- carbon dioxide, catalysts, catalytic activity, cooling systems, cupric oxide, hydrogenation, ion exchange, methanol, milling, nanoparticles, process design, zinc, zinc oxide
- CuO/ZnO/Al₂O₃ catalysts were prepared by a mechanical-force-driven solid-state ion-exchange method, and their catalytic performance for methanol synthesis was investigated in a manufactured reactor with an internal cooling system. With the increasing of milling speed during ball-milling, the ion exchange between Cu²⁺ and Zn²⁺ in catalyst precursors is enhanced. After calcination, CuO nanoparticles are neighboring to ZnO nanoparticles and ZnO nanoparticles serve as spacers to prevent the agglomeration of CuO nanoparticles, leading to a cross-distribution of CuO and ZnO in catalysts. The as-prepared catalysts exhibit excellent catalytic activities, and the highest CO₂ conversion and CH₃OH yield at 240 °C and 4 MPa can reach 59.5% and 43.7%, respectively. The extraordinary catalytic performance can be attributed to both the cross-distribution of CuO and ZnO nanoparticles caused by solid-state ion exchange and the promotion of reversible CO₂ hydrogenation reaction toward methanol synthesis by the internal cooling system.