丙烯直接环氧化Cu基催化剂的研究进展与挑战

作为一种重要的化工原料,环氧丙烷年产量近千万吨,然而目前工业上制备环氧丙烷的方法仍然面临着成本高、副产物多以及污染严重等问题。直接氧气氧化法进行丙烯环氧化因为具有原子经济、环保等优点受到了越来越多的关注。但是,催化过程中丙烯的α-H和环氧丙烷都具有很高的活性,使得在高转化率的条件下提升环氧丙烷选择性成为一个巨大的挑战。研究者们发现相较于其他币族金属,Cu基催化剂表现出更优异的丙烯直接环氧化反应性能。本综述总结梳理了近年来关于Cu基催化剂催化丙烯直接环氧化反应的研究成果,聚焦于Cu基催化剂改性方法,并对Cu基催化剂依然存在的问题和挑战进行深入探讨。

Direct Epoxidation of Propylene with Molecular O2: Progress and Challenge of Cu-Based Catalysts

As an important bulk chemical, the annual production of propylene oxide(PO) is around ten million tons, but its industrial production methods are still suffering from severe drawbacks such as high cost, many by-products and serious pollution. In contrast, direct epoxidation of propylene with molecular O2(DEP) has the advantages of atomic economy, environmental friendship and so on, which attracts more and more attention.However, the competing process of α-H abstraction of propylene and high activity of PO make it a grand challenge to simultaneously obtain high PO selectivity and high propylene conversion. It has been recognized that among the coinage metals, Cu-based catalysts exhibit excellent catalytic performance. The present work would summarize recent developments of Cu-based catalysts for DEP reaction. We would concentrate on how to tailor the Cu-based catalysts and pointed out some of the existing problems that need to be further studied.