Cheng S, Meng T, Mao D, Guo X, Yu J. Selective Hydrogenation of Dimethyl Oxalate to Methyl Glycolate over Boron-Modified Ag/SiO
2 Catalysts.
ACS OMEGA 2022;
7:41224-41235. [PMID:
36406499 PMCID:
PMC9670726 DOI:
10.1021/acsomega.2c04880]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 09/22/2022] [Indexed: 06/16/2023]
Abstract
The addition of boron (B) as a promoter to the Ag/SiO2 catalyst for the selective hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG) was investigated. A comparison of the preparation method for incorporation of B found that the addition during the ammonia evaporation deposition-precipitation synthesis of the Ag/SiO2 catalyst (Ag-B/SiO2) was inferior to incipient wetness impregnation introduction of the Ag/SiO2 catalyst (B/Ag/SiO2). Moreover, the effects of B contents (0.5-5 wt %) on the physicochemical properties and catalytic performance of the B/Ag/SiO2 catalysts were investigated by XRF, N2-physisorption, XRD, FTIR, TEM, EDX mapping, H2-TPR, NH3-TPD, XPS, and catalytic testing. The results indicated that both the catalytic activity and stability of the Ag/SiO2 catalyst were noticeably enhanced after the introduction of B. The B/Ag/SiO2 catalyst with 1 wt % B showed the best catalytic performance of 100% DMO conversion and 88.3% MG selectivity, which could be attributed to the highest dispersion of the active metal and the smallest Ag particle size stabilized by the strong interaction between silver and boron species.
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