Cs exchanged 12-tungstophosphoric acid supported on high-silica mesoporous Y zeolites for synthesis of ethyl lactate via catalytic esterification

• DOI: 10.1016/j.biombioe.2022.106552
• Publication Date: 2022-08-28T02:15:26Z
• Authors: Hengyu Shen; Yangtao Zhou; Guodong Wen; Lei Xu; Qiuyan Ding; Yanan Guan; Zhenyuan Yang; Yanzhao Sun; Xin Gao; Jinsong Zhang; Xiaolei Fan; Yilai Jiao
• Keywords: Ethyl lactate; Brønsted–Lowry acid–base theory

Ethyl lactate is a promising green solvent, which can be produced via esterification of biomass derived lactic acid and ethanol. Herein, we report the development highly active stable polyoxometalates (POMs) supported on zeolite catalysts for synthesis ethyl lactate. Repetitive stability tests were performed using developed catalysts, comparative characterization fresh used was to understand changes in physicochemical properties catalysts. It found that low-silica Y zeolites (silicon-to-aluminum ratio, SAR, 2 5) are prone dealuminated (by acid) under reaction conditions, thus being not suitable as catalyst support. Direct support 12-tungstophosphoric impregnation) high-silica (SAR40) led deactivation during catalysis due leaching. This issue solved by surface modification cesium (Cs) ions before impregnation because formed phosphotungstate insoluble reaction. As result, composite Cs exchanged mesoporous developed, showed good reusability. In detail, after seven cyclic tests, physiochemical catalytic performance remained relatively stable, e.g., yield at around 29.6%. Findings study show zeolitic heteropolyacid equally important obtaining esterification.