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Conversion of cellulose to polyols over promoted nickel catalystsf

机译：纤维素转化为多元醇，超过促进的镍催化剂

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摘要

Sorbitol is one of the key platform chemicals that can be applied to several industrial applications, including bio-fuels and hydrogen production. Presently there is no commercial heterogeneous catalytic process to produce sorbitol from cellulose due to the low yield and high cost of noble metals required for the conversion. In this paper we describe an aqueous phase hydrolysis-hydrogenation process to convert cellulose to sorbitol using a cheap Ni based catalyst. Monometallic Ni catalysts showed little activity for the reaction, but with the addition of a small amount of Pt to the Ni catalyst (Ni: Pt = 22:1 atom ratio), the activity was greatly enhanced. Results showed that the bimetallic Ni-Pt catalysts supported on mesoporous alumina gave a hexitol (sorbitol + mannitol) yield of 32.4% compared to only 5% with a Ni catalyst. Moreover, Ni-Pt supported on a mesoporous beta zeolite support provided even higher yield of 36.6%. These results were obtained after only 6 hours of run at 200 °C and 50 bar H_2 pressure (at room temperature). The presence of a small amount of Pt promotes the protonation of water and hydrogen molecules, which spill over to Ni sites creating in situ acid sites to catalyse hydrolysis of cellulose.
机译：山梨糖醇是可以应用于几种工业应用，包括生物燃料和氢生产的关键平台化学品之一。目前，由于转化率所需的低产和高成本，没有商业异质催化过程从纤维素中产生山梨糖醇。在本文中，我们描述了使用廉价Ni的催化剂将纤维素转化为山梨糖醇的水相水解氢化过程。单金属Ni催化剂对反应的活性很小，但是在Ni催化剂中添加了少量PT（Ni：Pt = 22：1原子比），该活性得到了极大的增强。结果表明，介孔氧化铝支持的双金属NI-PP催化剂的己二醇（山梨糖醇 +甘露醇）的产率为32.4％，而NI催化剂仅为5％。此外，在介孔β沸石支持下支持NI-PT，可提供36.6％的收益率。这些结果仅在200°C和50 bar H_2压力（在室温下）的6小时后获得。少量PT的存在促进了水和氢分子的质子化，它们溢出到ni位点产生原位酸位点，以催化纤维素的水解。

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