We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Hydrated Calcium Silicate Supported CaMoO<sub>4</sub> as an Efficient and Recyclable Catalyst for Selective Oxidation of Para-Alkylphenols with Hydrogen Peroxide.
- Authors
Zhong, Sheng; Liu, Zhangzhen; Zhang, Chao; Liu, Yachun; Fu, Zaihui
- Abstract
MoO42−-H2O2 is an efficient oxidation system for the conversion of para-alkyl-phenols to high value-added para-peroxyquinols and para-quinols, but its large-scale application is still limited to difficulty in catalyst recovery. This paper discloses that a hydrated calcium silicate (CS)-supported calcium molybdate (CM) catalyst (CMS) is easily fabricated in high-yield and large-scale by simple coprecipitation. Compared to the unsupported CM and Na2MoO4, CMS has an enhanced catalytic activity for the selective oxidation of para-alkyl-phenols, but also it shows a drastically improved selectivity for the target products, which can achieve 84% conversion and 100% selectivity for the goal products in catalyzing the oxidation of 2,4-xylenol with H2O2 in water. Also, it is very efficient for the selective oxidation of other p-alkyl substituted phenols in water or methanol, especially including the highly selective oxidation of p-cresol which is easy to be overoxidized. More importantly, the CMS catalytic system can be conveniently recovered and repeatedly run without significant activity loss, showing a good reusability. In situ UV-DRS and FT-IR spectra, as well as H2O2 decomposition experiments support that the alkaline CS carrier can induce the reaction of CMS with H2O2 to preferentially generate the mono-/di-peroxomolybdates as the key species for the selective oxidation of para-alkyl-phenols.
- Subjects
CATALYSTS recycling; HYDROGEN oxidation; CALCIUM silicates; SELECTIVE catalytic oxidation; HYDROGEN peroxide; CALCIUM silicate hydrate
- Publication
Catalysis Letters, 2024, Vol 154, Issue 2, p553
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-023-04334-x