Selective hydrogenolysis of biomass-derived sorbitol to propylene glycol and ethylene glycol on in-situ formed PdZn alloy catalysts
作者:Yuqing Jia、Qianhui Sun、Haichao Liu
DOI:10.1016/j.apcata.2020.117770
日期:2020.8
hydrogenolysis to industrially important propylene glycol and ethylene glycol receives increasing attention, recently. Here, we developed an efficient and stable PdZn alloy catalyst, in-situ formed from a physical mixture of Pd/ZrO2 and ZnO, for the sorbitol hydrogenolysis with Mg3AlOx as a solid base, and obtained a 54.6% yield of the two target glycols (493 K and 5.0 MPa H2). The amounts of ZnO and Mg3AlOx
最近山梨糖醇氢解为工业上重要的丙二醇和乙二醇受到越来越多的关注。在这里,我们开发了由Pd / ZrO 2和ZnO的物理混合物原位形成的高效稳定的PdZn合金催化剂,用于以Mg 3 AlO x为固体碱的山梨糖醇氢解反应,得到了54.6%的PdZn合金催化剂。两个目标二醇(493 K和5.0 MPa H 2)。ZnO和Mg 3 AlO x的量由于它们对PdZn合金的形成以及竞争性金属催化的脱氢/氢化和碱催化的逆醛醇缩合步骤的影响,因此极大地影响了活性和选择性。动力学同位素效应与H 2压力在较大范围(3.0-8.0 MPa)内对活性的抑制作用相结合,证实山梨醇脱氢为己糖中间体是山梨醇氢解中动力学相关的步骤。这项研究提供了对多元醇加氢水解为目标二醇的催化功能和反应参数的见解。