Ketkaew Marisa, Suttipat Duangkamon, Kidkhunthod Pinit, Witoon Thongthai, Wattanakit Chularat
Department of Chemical and Biomolecular Engineering, School of Energy Science and Engineering, Nanocatalysts and Nanomaterials for Sustainable Energy and Environment Research Network NANOTEC, Vidyasirimedhi Institute of Science and Technology Rayong 21210 Thailand
Synchrotron Light Research Institute (Public Organization) 111 University Avenue, Muang District Nakhon Ratchasima 30000 Thailand.
RSC Adv. 2019 Nov 5;9(62):36027-36033. doi: 10.1039/c9ra07793f. eCollection 2019 Nov 4.
The highly selective oxidation of alcohols to aldehydes has been achieved due to the synergic effect of Pt and CeO supported on hierarchical zeolites. The combination of Pt and CeO strongly enhances the catalytic performance of the oxidation of benzyl alcohol to benzaldehyde with respect to the isolated materials. In addition, the hierarchical zeolite not only increases the fraction of exposed active sites because of its high surface area that can prevent the aggregation of Pt and CeO nanoparticles, but also affects the oxidation state of cerium. The presence of a high content of trivalent Ce species (Ce) on the hierarchical zeolite benefits the oxidation reaction, eventually leading to almost 100% yield of an aldehyde product. Moreover, the catalytic performance can be further improved by the easily tunable Si to Al ratio of zeolite catalysts.
由于负载在分级沸石上的Pt和CeO的协同作用，实现了醇向醛的高选择性氧化。相对于单独的材料，Pt和CeO的组合显著提高了苯甲醇氧化为苯甲醛的催化性能。此外，分级沸石不仅因其高表面积（可防止Pt和CeO纳米颗粒聚集）而增加了暴露活性位点的比例，还影响铈的氧化态。分级沸石上高含量三价Ce物种（Ce）的存在有利于氧化反应，最终使醛产物的产率几乎达到100%。此外，通过易于调节的沸石催化剂的Si/Al比可进一步提高催化性能。
