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题名: Anatase TiO2 Activated by Gold Nanoparticles for Selective Hydrodeoxygenation of Guaiacol to Phenolics
作者: Mao, Jingbo1, 2, 3;  Zhou, Jinxia3;  Xia, Zhi1;  Wang, Zhiguang1;  Xu, Zhanwei1;  Xu, Wenjuan1;  Yan, Peifang1;  Liu, Kairui1;  Guo, Xinwen2;  Zhang, Z. Conrad1
关键词: guaiacol hydrogenation ;  phenol ;  gold catalyst ;  anatase ;  lignin
刊名: ACS CATALYSIS
发表日期: 2017
DOI: 10.1021/acscatal.6b02368
卷: 7, 期:1, 页:695-705
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Gold nanoparticles on a number of supporting materials, including anatase TiO2 (TiO2-A, in 40 nm and 45 pm), rutile TiO2 (TiO2-R), ZrO2, Al2O3, SiO2, and activated carbon, were evaluated for hydrodeoxygenation of guaiacol in 6.5 MPa initial H-2 pressure at 300 degrees C. The presence of gold nanoparticles on the supports did not show distinguishable performance compared to that of the supports alone in the conversion level and in the product distribution, except for that on a TiO2-A-40 nm. The lack of marked catalytic activity on supports other than TiO2-A-40 nm suggests that Au nanoparticles are not catalytically active on these supports. Most strikingly, the gold nanoparticles on the least-active TiO2-A-40 nm support stood out as the best catalyst exhibiting high activity with excellent stability and remarkable selectivity to phenolics from guaiacol hydrodeoxygenation. The conversion of guaiacol (similar to 43.1%) over gold on the TiO2-A-40 nm was about 33 times that (1.3%) over the TiO2-A-40 nm alone. The selectivity of phenolics was 87.1%. The products are mainly phenolic compounds with no aromatics and saturated hydrocarbons such as cyclohexane. The gold particle size ranging from 2.7 to 41 nm and water content were found to significantly affect the Au/TiO2-A-40 nm catalyst activity but not the product selectivity. The reaction rates of 0.26 and 0.91 (min(-1) g-cat(-1) cm(3)) were determined for guaiacol hydrogenation and catechol hydrogenation, respectively. Bimolecular methylation was established as the dominant mechanism for methyl group transfer among the phenolics. Two major pathways of guaiacol hydrogenation to phenolics over the 0.4Au-19 nm/TiO2-A-40 nm are proposed: (1) direct hydrogenation of guaiacol to form phenol and methanol, (2) hydrodehydroxylation of catechol intermediate from the transmethylation between guaiacol and phenol.
关键词[WOS]: VAPOR-PHASE HYDRODEOXYGENATION ;  AU NANOPARTICLES ;  LOW-TEMPERATURE ;  HYDROGENATION CATALYSIS ;  TRANSPORTATION FUELS ;  CO-OXIDATION ;  SUPPORTED NI ;  CONVERSION ;  PLATINUM ;  KINETICS
语种: 英语
WOS记录号: WOS:000391783200077
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/151867
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
2.Dalian Univ Technol, State Key Lab Fine Chem, PSU DUT Joint Ctr Energy Res, Sch Chem Engn, Dalian 116024, Peoples R China
3.Dalian Univ, Coll Environm & Chem Engn, Dalian 116622, Peoples R China

Recommended Citation:
Mao, Jingbo,Zhou, Jinxia,Xia, Zhi,et al. Anatase TiO2 Activated by Gold Nanoparticles for Selective Hydrodeoxygenation of Guaiacol to Phenolics[J]. ACS CATALYSIS,2017,7(1):695-705.
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