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Insight into the effect of support crystal form on semi-continuous oxidation of glycerol
Journal of Porous Materials ( IF 2.6 ) Pub Date : 2021-05-12 , DOI: 10.1007/s10934-021-01088-y
Xinyi Zhang , Mingyu Gao , Pengfei Yang , Xiaochen Cui , Yanan Liu , Dianqing Li , Junting Feng

In this work, two Pt catalysts using anatase and rutile as supports were prepared, and then the support effect on catalytic performance in glycerol oxidation was investigated. Different Pt/TiO2 catalysts exhibited not so negligible distinction on the product distribution. On one side, the C=O bonds of intermediate glyceraldehyde (GLYAD) highly dissociated in the form of bidentate species through C atom bonding to O atom and O atom bonding to Ti atom of rutile support, which largely promoted the transformation from GLYAD to glyceric acid (GLYA). While, in the case of anatase support, the adsorption form of C=O was monodentate. On another side, the formed GLYA was weakly adsorbed through two O atoms bridging/bonding to two Ti atoms. Due to the longer Ti–Ti distance in anatase, C–C cleavage of GLYA was obviously inhibited. The rutile support with shorter Ti–Ti distance inevitably led to obvious C–C cleavage. The discovery of the support effect could offer an alternative method to controllably regulate product distribution and offers specific perspective on designing efficient catalysts in semicontinuous oxidation reactions.



中文翻译:

深入了解载体晶型对甘油半连续氧化的影响

本工作制备了两种以锐钛矿和金红石为载体的Pt催化剂,然后研究了载体对甘油氧化催化性能的影响。不同的 Pt/TiO 2催化剂在产品分布上表现出的差异不是那么可以忽略不计。一方面,中间体甘油醛(GLYAD)的C=O键通过C原子与O原子键合,O原子与金红石载体Ti原子键合,以双齿物种的形式高度解离,极大地促进了GLYAD向甘油的转化。酸(GLYA)。而在锐钛矿载体的情况下,C=O 的吸附形式是单齿的。另一方面,形成的 GLYA 通过桥接/键合到两个 Ti 原子的两个 O 原子被弱吸附。由于锐钛矿中较长的 Ti-Ti 距离,GLYA 的 C-C 切割明显受到抑制。具有较短 Ti-Ti 距离的金红石支撑不可避免地导致明显的 C-C 解理。

更新日期:2021-05-12
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