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题名: H2O2 synthesis over PdAu membranes
作者: Shi, Lei;  Goldbach, Andreas1;  Zeng, Gaofeng;  Xu, Hengyong
通讯作者: 哥德巴赫
关键词: Hydrogen peroxide ;  Direct synthesis ;  PdAu membrane ;  Hydrogen permeation ;  Membrane reactor
刊名: CATALYSIS TODAY
发表日期: 2010-10-31
DOI: 10.1016/j.cattod.2010.02.038
卷: 156, 期:3-4, 页:118-123
收录类别: SCI
文章类型: Article
部门归属: 8
项目归属: 801
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: 2-3 mu m thick PdAu membranes have been prepared by sequential electroless plating on porous ceramic tubes followed by annealing at 823 K under H-2. Gas phase H-2 permeation rates had stabilized after 250 h annealing even though the alloy layers still remained inhomogeneous as evidenced by X-ray diffraction analyses after conclusion of all other experiments. The H-2 permeability of a Pd90.5Au9.5 membrane reached 1.2 x 10(-8) mol m(-1) s(-1) Pa-0.5 at 673K. A marked discontinuity in the temperature dependence of the H-2 permeation rate at 573 K signals a change from diffusion to adsorption or desorption-limited H-2 transport through the membrane below that threshold. H2O2 was directly synthesized from the elements over these PdAu membranes in O-2-saturated, acidic water/ethanol mixtures while feeding H-2 through the membrane. The H2O2 formation rate increased from 19.5 to 97.5 mmol m(-2) h(-1) between 277 and 363 K in water at 300 kPa H-2 feed pressure even though the H2O2 selectivity decreased from 56% to 30% in parallel. H2O2 yield and selectivity improved both with H-2 feed pressure, however. H2O2 formation rate and selectivity increased also moderately with ethanol content, but the PdAu layer tended to delaminate from the ceramic support if the ethanol content was raised above 50%. (C) 2010 Elsevier B.V. All rights reserved.
关键词[WOS]: HYDROGEN-PEROXIDE SYNTHESIS ;  GOLD-PALLADIUM ALLOYS ;  X-RAY ;  AB-INITIO ;  H-2 ;  O-2 ;  AU ;  OXIDATION ;  CATALYSTS ;  PD(111)
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000284665800007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/103571
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, Lab Appl Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Shi, Lei,Goldbach, Andreas,Zeng, Gaofeng,et al. H2O2 synthesis over PdAu membranes[J]. CATALYSIS TODAY,2010,156(3-4):118-123.
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