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题名: Direct H2O2 synthesis over Pd membranes at elevated temperatures
作者: Shi, Lei;  Goldbach, Andreas1;  Zeng, Gaofeng;  Xu, Hengyong
通讯作者: 徐恒泳
关键词: Hydrogen peroxide ;  Selective oxidation ;  Membrane reactor ;  Hydrogen permeation ;  H2O2 decomposition
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2010-02-15
DOI: 10.1016/j.memsci.2009.10.053
卷: 348, 期:1-2, 页:160-166
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 ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Polymer Science
研究领域[WOS]: Engineering ;  Polymer Science
英文摘要: H2O2 was directly synthesized from the elements over supported I'd membranes in O-2-saturated, aqueous H2SO4 (0.03 mol/l) between 303 and 348 K while feeding H-2 through the membrane. The H2O2 yield increased with temperature despite H2O2 selectivity declining simultaneously due to faster H2O2 decomposition. Both H2O2 yield and selectivity improved with H-2 feed pressure, however. Comparison of H-2 consumption during H2O2 synthesis with the intrinsic membrane H-2 permeability and the energetics of H-2 oxidation on Pd surfaces revealed that the H2O2 productivity gain with temperature was primarily owed to the acceleration of reaction kinetics. The H2O2 selectivity enhancement with H-2 feed pressure is attributed to the inhibition of direct H2O formation as a result of hindered O-2 dissociation due to blocking of O atom adsorption sites on the membrane surface because of increasing occupation by H atoms. H2O2. decomposition and reduction on the Pd membrane surface accelerate much faster with temperature than H2O2 formation and need to be suppressed in order to maximize H2O2 yield and H-2 utilization at higher temperatures. (C) 2009 Elsevier B.V. All rights reserved.
关键词[WOS]: HYDROGEN-PEROXIDE SYNTHESIS ;  PALLADIUM MEMBRANES ;  CATALYTIC MEMBRANES ;  COMPOSITE MEMBRANE ;  PD/SIO2 CATALYST ;  AB-INITIO ;  O-2 ;  H-2 ;  PD(111) ;  DECOMPOSITION
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000274765300020
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/102901
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. Direct H2O2 synthesis over Pd membranes at elevated temperatures[J]. JOURNAL OF MEMBRANE SCIENCE,2010,348(1-2):160-166.
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