Issue 45, 2019

B-SBA-16 encaged functional tungstosilicic acid type ionic liquids to catalyze the ketal reaction

Abstract

There is special significance to composite catalysts using SBA-16 nano-cages as carriers in the acid catalysis field. A method for embedding boron atoms onto SBA-16 to increase acidic sites and enhance the acidity of the nano-cages was described. The tungstosilicic acid type ionic liquid (SWIL) was encaged into B-SBA-16 acidic nano-cages to obtain various composite catalysts. The acidic nano-cages and composite catalysts were characterized by FT-IR, TG/DSC, SAXD, BET, SEM, TEM, XPS and 1H NMR analyses. Research confirmed that boron was embedded onto the SBA-16 nano-cages in varying proportions and the obtained B-SBA-16 acidic nano-cages still maintained a high degree of pore ordering. The SWIL was successfully encapsulated into the acidic nano-cages via the immersion method. The cage-encapsulated tungstosilicic acid type ionic liquid catalysts SWIL/B(n)-SBA-16 were applied to catalyze the ketal reaction of cyclohexanone (CYC) with ethylene glycol (EG). The results showed that the conversion of CYC could reach 92.01% along with the yield of cyclohexanone ethylene glycol ketal (CGK) of 83.87% under ideal conditions. The CYC conversion was still nearly 86.86% and the CGK yield was 69.50% even after 8 times of continuous reuse.

Graphical abstract: B-SBA-16 encaged functional tungstosilicic acid type ionic liquids to catalyze the ketal reaction

Supplementary files

Article information

Article type
Paper
Submitted
27 Jul 2019
Accepted
22 Oct 2019
First published
22 Oct 2019

Dalton Trans., 2019,48, 17106-17116

B-SBA-16 encaged functional tungstosilicic acid type ionic liquids to catalyze the ketal reaction

Y. Xie, Q. Zhao, G. Gao and T. Jiang, Dalton Trans., 2019, 48, 17106 DOI: 10.1039/C9DT03077H

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