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<p>Catalysts were developed for the depolymerization of plant polysaccharides based on mesoporous mesostructured silica SBA-15 doped with Al and Zr oxides to enhance acidity. The catalysts were studied by a set of physicochemical methods (X-ray diffraction (XRD), low-temperature adsorption—desorption of N<sub>2</sub>, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), magic angle spinning (MAS) NMR spectroscopy, IR spectroscopy, and point of zero charge (pzc) determination, as well as tested during arabinogalactan depolymerization to high value-added products. The catalyst acidity is the parameter predetermining its activity in the depolymerization. The acidity of the catalysts with the combined doping of SBA-15 with Al and Zr oxides is higher than the one with the individual doping. The maximum yield of monomeric products on 2.5Al-5Zr-SBA-15 is 61.2 wt.% (4 h). Arabinose (4.6 wt.%), galactose (45.2 wt.%), furfural (3.0 wt.%), and 5-hydroxymethylfurfural (16.2 wt.%) are observed among the major products.</p>

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Deep processing of hemicelluloses to high value-added products and hydrolysis of arabinogalactan on the Al-Zr-SBA-15 solid catalysts

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Yu. A. Trotsky,
  • V. V. Sychev,
  • S. A. Novikova,
  • A. O. Eremina,
  • O. P. Taran

摘要

Catalysts were developed for the depolymerization of plant polysaccharides based on mesoporous mesostructured silica SBA-15 doped with Al and Zr oxides to enhance acidity. The catalysts were studied by a set of physicochemical methods (X-ray diffraction (XRD), low-temperature adsorption—desorption of N2, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), magic angle spinning (MAS) NMR spectroscopy, IR spectroscopy, and point of zero charge (pzc) determination, as well as tested during arabinogalactan depolymerization to high value-added products. The catalyst acidity is the parameter predetermining its activity in the depolymerization. The acidity of the catalysts with the combined doping of SBA-15 with Al and Zr oxides is higher than the one with the individual doping. The maximum yield of monomeric products on 2.5Al-5Zr-SBA-15 is 61.2 wt.% (4 h). Arabinose (4.6 wt.%), galactose (45.2 wt.%), furfural (3.0 wt.%), and 5-hydroxymethylfurfural (16.2 wt.%) are observed among the major products.