Perkas Nina, Gunawan Poernomo, Amirian Galina, Wang Zhan, Zhong Ziyi, Gedanken Aharon
Department of Chemistry at Bar-Ilan University Center for Advanced Materials and Nanotechnology, Bar-Ilan University Center for Advanced Materials and Nanotechnology, Ramat-Gan 52900, Israel.
Phys Chem Chem Phys. 2014 Apr 28;16(16):7521-30. doi: 10.1039/c3cp55307h.
The CuO-ZnO composite was deposited onto two kinds of titania supports, which are synthetic mesoporous TiO2 and commercial TiO2 P25 (Degussa), via the ultrasound assisted precipitation and incipient wetness impregnation (IWI) methods, respectively. The catalysts were tested for WGS reaction in the temperature range of 200-400 °C, and the best catalytic performance was achieved for the sonochemically prepared catalysts supported on the commercial TiO2 P25, which contains well crystallized anatase and rutile phases. Although the synthetic mesoporous TiO2 has a higher surface area, its textural structure is not stable under the reaction conditions, leading to gradual deactivation of the CuO-ZnO/TiO2 catalyst. It is found that the sonochemical preparation offers at least two advantages: (1) generation of mesopores on the catalyst surface and (2) doping of ZnO into the CuO phase. The doping of ZnO, particularly in the case of commercial TiO2 P25, provides high activity and extra stability to the active phase of Cu(0). These new findings provide new insights into the design and development of better heterogeneous catalysts for WGS reaction.
通过超声辅助沉淀法和初湿浸渍法（IWI），分别将CuO-ZnO复合材料负载在两种二氧化钛载体上，即合成介孔TiO₂和商用TiO₂ P25（德固赛）。在200-400℃的温度范围内对催化剂进行了水煤气变换反应测试，负载在商用TiO₂ P25上的超声化学制备催化剂表现出最佳的催化性能，该载体包含结晶良好的锐钛矿相和金红石相。尽管合成介孔TiO₂具有更高的比表面积，但其织构结构在反应条件下不稳定，导致CuO-ZnO/TiO₂催化剂逐渐失活。研究发现，超声化学制备至少具有两个优点：（1）在催化剂表面产生介孔；（2）将ZnO掺杂到CuO相中。ZnO的掺杂，特别是在商用TiO₂ P25的情况下，为Cu(0)活性相提供了高活性和额外的稳定性。这些新发现为设计和开发用于水煤气变换反应的更好的多相催化剂提供了新见解。
