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催化剂的性质对超临界乙醇条件下热解木质素液化的影响
姚倩a,唐喆b,郭建华a,张颖a*,郭庆祥a
作者单位E-mail
姚倩a 中国科学技术大学化学系能源材料化学协同创新中心安徽省生物质洁净能源重点实验室合肥 230026  
唐喆b 盐城工学院化学与生物工程学院盐城 224051  
郭建华a 中国科学技术大学化学系能源材料化学协同创新中心安徽省生物质洁净能源重点实验室合肥 230026  
张颖a* 中国科学技术大学化学系能源材料化学协同创新中心安徽省生物质洁净能源重点实验室合肥 230026 zhzhying@ustc.edu.cn 
郭庆祥a 中国科学技术大学化学系能源材料化学协同创新中心安徽省生物质洁净能源重点实验室合肥 230026  
摘要:
研究了在超临界乙醇中、氢气存在下,一系列金属-酸双功能催化剂的酸性、孔径大小、负载的金属对热解木质素加氢裂解过程的影响.制备并采用N2等温吸附和BET比表面、X射线衍射、NH3-程序升温脱附技术对催化剂进行表征.实验结果表明催化剂酸性增强可促进热解木质素的缩聚反应,从而产生大量的焦炭和水,导致其液化效率降低.微孔催化剂比介孔催化剂孔径小,与强酸共同作用会导致热解木质素裂解生成更多的小分子气体.在催化剂上负载金属Ru可有效地抑制热解木质素的缩聚反应,促进其裂解液化.
关键词:  热解木质素  氢化裂解  双功能催化剂
DOI:10.1063/1674-0068/28/cjcp1409167
分类号:
基金项目:
Effect of Catalyst Properties on Hydrocracking of Pyrolytic Lignin to Liquid Fuel in Supercritical Ethanol
Qian Yaoa,Zhe Tangb,Jian-hua Guoa,Ying Zhanga*,Qing-xiang Guoa
Abstract:
The metal-acid bifunctional catalysts have been used for bio-oil upgrading and pyrolytic lignin hydrocracking. In this work, the effects of the metal-acid bifunctional catalyst properties, including acidity, pore size and supported metal on hydrocracking of pyrolytic lignin in supercritical ethanol and hydrogen were investigated at 260 oC. A series of catalysts were prepared and characterized by BET, XRD, and NH3-TPD techniques. The results showed that enhancing the acidity of the catalyst without metal can promote pyrolytic lignin polymerization to form more solid and condensation to produce more water. The pore size of microporous catalyst was smaller than mesoporous catalyst. Together with strong acidity, it caused pyrolytic lignin further hydrocrack to numerous gas. Introducing Ru into acidic catalysts promoted pyrolytic lignin hydrocracking and inhibited the polymerization and condensation, which caused the yield of pyrolytic lignin liquefaction product to increase significantly. Therefore, bifunctional catalyst with high hydrocracking activity metal Ru supported on materials with acidic sites and mesopores was imperative to get satisfactory results for the conversion of pyrolytic lignin to liquid products under supercritical conditions and hydrogen atmosphere.
Key words:  Pyrolytic lignin  Hydrocracking  Bifunctional catalyst