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题名: Influence of Pd precursors on the catalytic performance of Pd-H4SiW12O40/SiO2 in the direct oxidation of ethylene to acetic acid
作者: Xu, Shuliang1, 2;  Wang, Lixia1, 2;  Chu, Wenling1;  Yang, Weishen1
关键词: Ethylene oxidation ;  Acetic acid ;  Pd-SiW12/SiO2 ;  Pd dispersion
刊名: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
发表日期: 2009-09-01
DOI: 10.1016/j.molcata.2009.06.008
卷: 310, 期:1-2, 页:138-143
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: The effects of palladium precursors (PdCl2, (NH4)(2)PdCl4, Pd(NH3)(2)Cl-2, Pd(NO3)(2) and Pd(CH3COO)(2)) on the catalytic properties in the selective oxidation of ethylene to acetic acid have been investigated for 1.0wt% Pd-30wt% H4SiW12O40/SiO2. The structures of the catalysts were characterized using X-ray diffraction, N-2 adsorption, H-2-pulse chemical adsorption, infrared spectrometry of the adsorbed pyridine, H-2 temperature-programmed reduction and X-ray photoelectron spectroscopy. The present study demonstrates that the different palladium precursors can lead to the significant changes in the dispersion of palladium. It is found that Pd dispersion decreases as follows: PdCl2>(NH4)(2)PdCl4>Pd(NO3)(2)>Pd(NH3)(2)Cl-2>Pd(C2H3O2)(2), which is nearly identical to the catalytic activity. This indicates that the dispersion of palladium plays an important role in the catalytic activity. Furthermore, density of Lewis (L) and Bronsted (B) acid sites are also strongly dependent on the palladium precursors. it is also demonstrated that an effective catalyst should possess a well combination of Bronsted acid sites with dispersion of palladium. (C) 2009 Elsevier B.V. All rights reserved.
关键词[WOS]: SELECTIVE OXIDATION ;  SKELETAL ISOMERIZATION ;  VAPOR-PHASE ;  N-HEPTANE ;  PALLADIUM ;  ETHENE ;  CONVERSION ;  ZIRCONIA ;  HYDROGEN
语种: 英语
WOS记录号: WOS:000269426900017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141471
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 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

Recommended Citation:
Xu, Shuliang,Wang, Lixia,Chu, Wenling,et al. Influence of Pd precursors on the catalytic performance of Pd-H4SiW12O40/SiO2 in the direct oxidation of ethylene to acetic acid[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2009,310(1-2):138-143.
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