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题名: Comparative study by infrared spectroscopy and microcalorimetry of the CO adsorption over supported palladium catalysts
作者: Guerrero-Ruiz, A;  Yang, SW;  Xin, Q;  Maroto-Valiente, A;  Benito-Gonzalez, M;  Rodriguez-Ramos, I
刊名: LANGMUIR
发表日期: 2000-10-17
DOI: 10.1021/la000387j
卷: 16, 期:21, 页:8100-8106
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: The adsorption of CO on Al(2)O(3), ZrO(2), ZrO(2)-SiO(2), and ZrO(2)-La(2)O(3) supported Pd catalysts was studied by adsorption microcalorimetry and infrared (TR) spectroscopy. Some interesting and new correlations between the results of microcalorimetry and IR spectroscopy have been found. The CO is adsorbed on palladium catalysts in three different modes: multibonded (3-fold), bridged (2-fold), both on Pd(lll) and (100) planes, and linear (1-fold) adsorbed species. The corresponding differential adsorption heats lie in the field of high (210-170 kJ/mol), medium (140-120 kJ/mol), and low (95-60 kJ/mol) values, respectively. The nature of the support, the reduction temperature, and the pretreatment conditions affect the surface structure of the Pd catalysts, resulting in variations in the site energy distribution, i.e., changes in the fraction of sites adsorbing CO with specific heats of adsorption. Moreover, the CeO(2); promoter addition weakens the adsorption strength of CO on palladium. Based on the exposed results, a correctness factor, which considers the percentages of various CO adsorption states, must be introduced when one calculates the Pd dispersion using CO adsorption data.
关键词[WOS]: METHANE OXIDATION ;  CARBON-MONOXIDE ;  CALORIMETRIC HEAT ;  CRYSTALLITE SIZE ;  PD ;  COMBUSTION ;  DESORPTION ;  HYDROGENATION ;  CHEMISORPTION ;  TEMPERATURE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000089799900032
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/85089
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.CSIC, Inst Catalisis & Petroleoquim, Madrid 28049, Spain
2.Univ Nacl Educ Distancia, Fac Ciencias, Dept Quim Inorgan & Tecn, Madrid 28040, Spain
3.Acad Sinica, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
4.Surtrey MSL, Madrid 28045, Spain

Recommended Citation:
Guerrero-Ruiz, A,Yang, SW,Xin, Q,et al. Comparative study by infrared spectroscopy and microcalorimetry of the CO adsorption over supported palladium catalysts[J]. LANGMUIR,2000,16(21):8100-8106.
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