Mn/ZSM-5 participation in the degradation of cellulose under phosphoric acid media

Mn/ZSM-5 participation in the degradation of cellulose under phosphoric acid media
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Mn/ZSM-5参与磷酸介质下纤维素的降解

DOI:
10.1016/j.polymdegradstab.2011.02.007
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发表时间:
2011-05
影响因子:
5.9
通讯作者:
Li, Gang
Li, Gang
中科院分区:
化学2区
文献类型:
--
作者:
Zhang, Song-Mei;Yang, Fang;Chen, Yang;Li, Gang

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研究了非均相Fenton试剂、催化剂Mn/ZSM-5和磷酸介质联合作用下纤维素的降解反应。磷酸溶液具有良好的破坏分子间和分子内氢键从而促进纤维素活化的能力,因此被选为降解纤维素的反应介质。由H_2O_2、Mn/ZSM-5和磷酸组成的类Fenton体系能有效地将纤维素解聚为可溶性糖,并能以较低的聚合度部分降解纤维素。从反应溶液中提取了小分子产物5-羟甲基呋喃和乙酰丙酸。考察了催化剂Mn/ZSM-5的性能及反应条件对5-羟甲基呋喃甲醛摩尔产率的影响。提出了反映纤维素在反应中降解的主要途径的三步降解方案。
The degradation reactions of cellulose under a combination of heterogeneous Fenton-like reagent with catalyst Mn/ZSM-5 and phosphoric acid media have been investigated. Phosphoric acid solution was selected as the reactive medium for the degradation of cellulose due to its good ability to destroy inter- and intra-molecular hydrogen bond so as to promote cellulose activation. The Fenton-like system, composing of H2O2and Mn/ZSM-5 in combination with phosphoric acid, can effectively depolymerize cellulose to soluble sugars and partly degraded cellulose with much lower degree of polymerization. Small molecular products, 5-hydroxymethyl furfural and levulinic acid were extracted from the reaction solution. The performance of the catalyst Mn/ZSM-5 and the effect of reaction factors on the molar yield of 5-hydroxymethyl furfural were investigated. A three-step degradation scheme reflecting the main pathways of cellulose degradation in the reaction is proposed.
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