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题名: Novel reverse microemulsion and its application to synthesis of nanostructured La0.95Ba0.05MnAl11O19-alpha catalyst for methane combustion
作者: Xu, JG;  Teng, F;  Tian, ZJ;  Qu, XH;  Zhang, PQ;  Xu, YP;  Xiong, GX;  Lin, LW
关键词: methane ;  catalytic combustion ;  reverse microemulsion ;  hexaaluminate ;  n-butanol ;  i-propanol
刊名: ACTA CHIMICA SINICA
发表日期: 2005-12-28
卷: 63, 期:24, 页:2205-2210
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: A novel type of reverse microemulsion system composed of water, i-propanol and n-butanol was developed as a reaction medium to prepare substituted-hexaaluminate La0.95Ba0.05MnAl11O19-alpha catalyst for methane combustion. The structure and properties of water in the novel reverse microemulsion system were investigated by means of H-1 NMR, FT-IR, electrical conductometry and laser light scattering apparatus. The electric conductivity of the novel reverse microemulsion system followed a nonlinear correlation when the volume fraction of water was low. There existed a critical point of phi(P) (0.15) along the k similar to phi curve. H-1 NMR revealed that the chemical shift of the water proton signal moved to upfield with decreasing water content. FTIR showed that the nu(O-D) band was shifted to higher frequency with increasing water concent. The size distribution of the Al(OH)(3) gel particles formed by hydrolysis of Al(i-OC3H7)(3) in the novel reverse microemulsion ranged from 226 to 329 nm with the average diameter of 267 nm. Substituted hexaaluminate La0.95Ba0.05MnAl11O19-alpha synthesized in the novel reverse microemulsion system possesses a surface area of 65 m(2)/g, comparable to 32 m(2)/g of similar samples prepared with pure water. XRD measurements revealed that beta-Al2O3 was the only phase for this catalyst after calcination at 1200 degrees C for 10 h and its particle size measured by TEM is about 30 nm. This nanostructured hexaaluminate, when used as a catalyst for CH4 combustion, allowed a light-off of a stream of 1% CH4 in air at 420 degrees C, as compared to 5 10 degrees C required for similar catalyst prepared with pure water. The excellent low-temperature catalytic activity of this catalyst arised from the formation of nanostrctured hexaaluminate that contained larger amount of manganese.
关键词[WOS]: WATER ;  TEMPERATURE ;  SYSTEMS ;  BAMNAL11O19-ALPHA ;  NANOPARTICLES ;  IR
语种: 英语
WOS记录号: WOS:000234157000005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139873
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.Inst Appl Catalysis, Yantai 264005, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Lab Nat Gas Utilizat & Appl Catalysis, Dalian 116023, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Xu, JG,Teng, F,Tian, ZJ,et al. Novel reverse microemulsion and its application to synthesis of nanostructured La0.95Ba0.05MnAl11O19-alpha catalyst for methane combustion[J]. ACTA CHIMICA SINICA,2005,63(24):2205-2210.
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