Selective conversion of xylose to lactic acid over metal-based Lewis acid supported on γ-Al2O3 catalysts

[Display omitted] •Deposition of Cr, Co, Cu, Ni, or Sn oxides on γ-Al2O3 can promote Lewis acid sites of catalysts.•The acidity of catalyst influences the lactic acid yield.•Oxides of Cr, Co, Cu, Ni, or Sn supported on γ-Al2O3 can induce the D-xylose conversion up to 99%.•Cr/Al2O3 and Sn/Al2O3 are t...

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Published inCatalysis today Vol. 367; pp. 205 - 212
Main Authors Kosri, Chanokporn, Kiatphuengporn, Sirapassorn, Butburee, Teera, Youngjun, Saran, Thongratkaew, Sutarat, Faungnawakij, Kajornsak, Yimsukanan, Chakrit, Chanlek, Narong, Kidkhunthod, Pinit, Wittayakun, Jatuporn, Khemthong, Pongtanawat
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2021
Subjects
Al2O3
Heterogeneous catalyst
Lactic acid
Metal oxides
Xylose
Xylose
Metal oxides
Heterogeneous catalyst
Lactic acid
Al2O3
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Summary:[Display omitted] •Deposition of Cr, Co, Cu, Ni, or Sn oxides on γ-Al2O3 can promote Lewis acid sites of catalysts.•The acidity of catalyst influences the lactic acid yield.•Oxides of Cr, Co, Cu, Ni, or Sn supported on γ-Al2O3 can induce the D-xylose conversion up to 99%.•Cr/Al2O3 and Sn/Al2O3 are the outstanding catalysts for lactic production with the yield up to 70%. Gamma-alumina (γ-Al2O3) is a low-cost amphoteric solid catalyst which can enhance the transformation of d-xylose into lactic acid. The deposition of metal oxides on γ-Al2O3 could further improve the yield of lactic acid from xylose. Therefore, in this work, the thermochemical catalytic conversion of d-xylose to lactic acid using the Cr, Cu, Co, Ni, and Sn oxides supported on γ-Al2O3 as heterogeneous catalysts was studied. The effects of metal oxides on the d-xylose conversion to lactic acid activity of the catalysts were investigated. It was found that, under identical testing conditions (170 °C, 4 h), Cr/Al2O3 is superior to the other catalysts with the 99 % conversion of d-xylose and the lactic acid yield of 74%. The outstanding activity could be attributed to its richness in Lewis-acid sites. Since the highly active Cr/Al2O3 catalyst is composed of the earth-abundant materials and can be prepared by a simple process, it has feasibility for industrial-scale application.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2020.04.061