Selective oxidation of monoethanolamine to glycine over supported gold catalysts: The influence of support and the promoting effect of polyvinyl alcohol
作者:Xiangzhan Meng、Yinge Bai、Haiyang Xu、Yongqiang Zhang、Chunshan Li、Hui Wang、Zengxi Li
DOI:10.1016/j.mcat.2019.03.011
日期:2019.5
with higher base content exhibited higher initial activity and that with lower acid content gave higher glycine selectivity. The influence of preparation methods was revealed using Au/ZrO2 with the best catalytic performance and it was demonstrated that the presence of polyvinyl alcohol (PVA) has a significant promoting effect. In-situ FTIR and 1H NMR analysis revealed that the hydrogen bonds between
甘氨酸是许多领域中使用的重要精细化学品,传统的合成方法(如Strecker合成和氯乙酸氨化)使用剧毒试剂或产生等摩尔的副产物。本文中,研究了使用负载在包括Al 2 O 3,SiO 2,TiO 2,ZnO和ZrO 2在内的各种载体上的Au催化剂将单乙醇胺(MEA)选择性好氧氧化为甘氨酸,并研究了其酸碱性质之间的相关性。建立了催化剂和催化性能。碱含量较高的催化剂表现出较高的初始活性,而酸含量较低的催化剂则具有较高的甘氨酸选择性。使用Au / ZrO揭示了制备方法的影响2具有最佳的催化性能,并且证明聚乙烯醇(PVA)的存在具有显着的促进作用。原位FTIR和1 H NMR分析表明,PVA和MEA之间的氢键可增强MEA在催化剂上的吸附,从而使转换频率(TOF)翻倍,并提高MEA转化率;MEA的氨基与PVA的羟基之间的优先氢键可以防止氨基与Au纳米粒子的配位,有利于MEA的羟基在活性位上反应,从而提高