Enhanced chemoselective hydrogenation of dimethyl oxalate to methyl glycolate over bimetallic Ag-Ni/SBA-15 catalysts

Junfu Zhou, Xinping Duan, Linmin Ye, Jianwei Zheng, Molly Meng Jung Li, S. C.Edman Tsang, Youzhu Yuan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)

Abstract

Mesoporous silica SBA-15-supported bimetallic silver-nickel catalysts (Ag-Ni/SBA-15) were prepared by a co-impregnation method for the chemoselective hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG). The structure and physicochemical properties of the catalysts were characterized using N2 adsorption-desorption, X-ray fluorescence spectroscopy, transmission electron microscopy, H2erature-programmed reduction, UV-vis light diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, fourier-transform infrared spectroscopy and ester temperature-programed desorption. Compared with monometallic Ag or Ni catalyst, the bimetallic Ag-Ni/SBA-15 catalysts exhibited enhanced catalytic performance for the chemoselective hydrogenation of DMO to MG. The optimized Ag-Ni/SBA-15 catalyst with a Ni/Ag atomic ratio of 0.2 presented the highest MG yield and excellent catalytic stability during the hydrogenation of DMO to MG for longer than 140 h. The characterization results suggested that the Ag and Ni bimetallic nanoparticles on the catalyst surfaces likely formed a segregation structure with more Ni species in the core and more Ag in the shell, and electron transfer from Ni to Ag possibly occurred. The interactions between the Ag and Ni species generated more active/adsorption sites and prevented the transmigration of bimetallic nanoparticles during hydrogenation.

Original languageEnglish
Pages (from-to)344-353
Number of pages10
JournalApplied Catalysis A: General
Volume505
DOIs
Publication statusPublished - 25 Sep 2015
Externally publishedYes

Keywords

  • Dimethyl oxalate
  • Hydrogenation
  • Methyl glycolate
  • Nickel
  • Silver

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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