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Chemistry and Industry of Forest Products ›› 2018, Vol. 38 ›› Issue (3): 48-54.doi: 10.3969/j.issn.0253-2417.2018.03.006

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Directional Liquefaction of Bamboo Catalyzed by Cu Doped Porous Metal Oxide

YE Jiewang1,2, JIANG Jianchun1, MA Zhongqing2, ZHANG Weigang2, LU Fengzhu2   

  1. 1. Institute of Chemical Industry of Forest Products, CAF;National Engineering Lab. for Biomass Chemical Utilization;Key and Open Lab. of Forest Chemical Engineering, SFA;Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China;
    2. Cooperative Innovation Center of Bamboo Resources and Efficient Utilization in Zhejiang Province, Zhejiang Agriculture & Forestry University, Lin'an 311300, China
  • Received:2017-10-30 Online:2018-06-25 Published:2018-06-22

Abstract: Cu doped porous metal oxide (PMO) catalysts were prepared using hydrotalcite-like compound as precursors. The synthesized catalysts were characterized by ICP, BET and XPS. The ICP analysis showed that metal loaded on the catalysis equated with the experiment design, which indicated that no obvious mass loss of metal ion during the formation and calcinations of hydrotalcite-like compound. BET analysis indicated a higher surface area in the doped PMO than the undoped. Appearance of PMO catalysts changed from green to red after the reaction. XPS studies showed that the color change was accompanied with the reduction of Cu (Ⅱ) to Cu(I)/Cu(0). The effects of reaction parameters on the liquefaction and products composition of bamboo were investigated in supercritical methanol medium. The results showed that under the conditions of 10% Cu0.2Mg0.8Al-LDO, reaction temperature of 280℃, and reaction time of 8 h, the liquefaction rate was 95.7%, the contents of alcohols and ketones in the liquefaction product were 55.7%, and almost no acid was found, indicating that the bamboo was converted to the liquid product mainly composed of small alcohols and ketones after depolymerization and hydrogenation. The amounts of products with low oxygen content such as ketones, alcohols and hydrocarbons increased with the increase of Cu doping levels and more catalysts dosage, while the amount of ester decreased significantly. The supercritical temperature of methanol was a key factor for the composition and distribution of the products. Generally, longer time resulted in higher contents of alcohols, ketones and hydrocarbons. These results supported that Cu doped PMO catalyst was an effective catalyst for both hydrogenolysis and hydrogenation of bamboo by in situ produced H2 from methanol.

Key words: depolymerization, lignocellulosic biomass, fine chemicals, supercritical methanol, hydrogenation

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