Ce基催化剂在HCl催化氧化中的研究进展

Research Progress of Ce-Based Catalysts in Catalytic Oxidation of HCl

氯化学工业过程中会产生大量副产物氯化氢(HCl),虽HCl存在工业用途,但仍供过于求。从HCl中回收氯气(Cl2)既可提高Cl原子的利用率,又可减少HCl对环境的污染。多相催化氧化HCl (Deacon过程)是实现从HCl中回收Cl2最为有效且经济的方法,工业应用中的催化剂以Ru基催化剂居多,但由于Ru稀缺的资源和昂贵的成本,Ce基催化剂成为了可部分替代Ru基催化剂的理想选择。Ce除了具有丰富的矿产资源的优势外,CeO2在Ce3+/Ce4+之间还表现出较好的可逆氧化还原性能,有利于促进催化氧化反应。但是,进一步提高Ce基催化剂的催化活性仍是亟需解决的问题。本文主要综述了Ce基催化剂在HCl催化氧化中的最新研究进展,介绍了如何提高Ce基催化剂的催化性能,同时还阐述了Ce基材料的表面反应机理,对未来Ce催化剂的发展进行了展望。

A large number of by-products hy-drogen chloride (HCl) is produced in the process of chlorine chemical industry. Although HCl has industrial uses, it is still in oversupply. Recovering chlorine (Cl2) from HCl can not only improve the utilization rate of Cl atoms, but also relieve the pollution of HCl to the environment. Heterogeneous catalytic oxidation of HCl is the most effective and economical method to recover Cl2 from HCl, and the industrial application of catalysts is mostly based on Ru. However, due to the high cost of Ru, Ce-based catalysts have become an ideal choice to partially replace Ru-based catalysts. Besides its advantage of rich mineral resources, CeO2 shows excellent reversible redox performance between Ce3+ and Ce4+, which is conducive to promoting catalytic oxidation. However, it is still an urgent problem to further improve the catalytic activity of Ce-based catalysts. In this paper, we mainly re-view the latest research progress of Ce-based catalysts in HCl catalytic oxidation, and introduce how to improve the catalytic performance of Ce-based catalysts. At the same time, we expound the sur-face reaction mechanism of Ce-based materials, and the future development of Ce-based catalysts is prospected.