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Selective conversion of lactic acid to acrylic acid over alkali and alkaline-earth metal co-modified NaY zeolites

Abstract

Alkali and alkaline-earth metal cation co-modified NaY zeolites are systematically synthesized and comprehensively investigated as catalysts for gas-phase dehydration of lactic acid (LA) to acrylic acid (AA). Long-term (time-on-stream > 55 h) catalytic performance in four repeated reaction-regeneration cycles is studied. The best performing catalyst shows consistently high AA selectivity of ~84 % at different weight hourly space velocity (WHSV) ranging from 0.48 to 4.8 hr-1. Most importantly, the catalyst can still deliver a high AA selectivity of ~82% after four long-term reaction-regeneration cycles. Investigation shows that mild etching increases defect density of the zeolite and thus leads to poor hydrothermal stability in the long-term reaction-regeneration cycles. Strong acidic adsorbate/catalyst surface interaction (base property) and the acidity of the catalyst are responsible for the catalyst deactivation. The role of the alkali and alkaline-earth metal cations and the transformation of the cations during the reaction and regeneration process is presented.

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Publication details

The article was accepted on 07 Nov 2017 and first published on 08 Nov 2017


Article type: Paper
DOI: 10.1039/C7CY02142A
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Selective conversion of lactic acid to acrylic acid over alkali and alkaline-earth metal co-modified NaY zeolites

    L. L. Zhang, D. S. Theng, Y. Du, S. Xi, L. Huang, F. Gao, C. Wang, L. Chen and A. Borgna, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY02142A

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