Direct conversion of cellulose into polyols over Ni/W/SiO₂-Al₂O₃

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• 作者：In Gu Baek ; Su Jin You ; Eun Duck Park ; ^{edpark@ajou.ac.kr}
• 关键词：Cellulose ; Polyol ; Hydrogenolysis ; NiW ; Silica&ndash ; alumina
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：June, 2012
• 卷：114
• 期：Complete
• 页码：684-690
• 文件大小：279 K

摘要

The direct conversion of cellulose into polyols over Ni/W/SiO₂-Al₂O₃ catalysts with different Al molar fractions was examined. For comparison, Cu/W/SiO₂-Al₂O₃, Fe/W/SiO₂-Al₂O₃, and Co/W/SiO₂-Al₂O₃ were also evaluated. The bulk crystalline structure was determined using X-ray diffraction (XRD). The surface acidity was probed via temperature-programmed desorption of ammonia (NH₃-TPD). The textural properties were investigated using N₂ physisorption. The metal contents were confirmed via inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Among the various metal catalysts, Ni/W/SiO₂-Al₂O₃ was confirmed to be the most favorable for hydrogenolysis of cellulose into polyols. The effect of the Al molar fraction in SiO₂-Al₂O₃ on this reaction over Ni/W/SiO₂-Al₂O₃ was also investigated. It was found that the polyol yield was closely related to the total acidity of the support. Compared to Ni/W/SBA-15, Ni/W/SiO₂-Al₂O₃ (Al/(Al + Si) = 0.6) showed better stability during the recycling test. The catalyst deactivation was confirmed to be caused by metal leaching.