کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5397277 | 1392327 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Surface electronic structure-catalytic activity relationship of partially reduced WO3 bulk or deposited on TiO2
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
Catalytic reactions of n-pentane and 1-pentene were carried out as a function of the reduction process of WO3 as bulk or supported on TiO2. In situ characterization by XPS-UPS techniques of the different chemical species formed following the reduction processes was performed. At reduction temperatures up to 773Â K, two distinct W5+ and W4+ states were obtained. The acid functions associated with W5+, mainly of Brönsted type, enabled to isomerize only 1-pentene to unsaturated products. Dual metal-acid functions (bifunctional) of the W4+ state perform the isomerization processes of 1-pentene and n-pentane to isopentane in similar way to highly dispersed platinum on alumina catalysts. A conversion of 56% of n-pentane and a selectivity of 87% to isopentane were obtained at 623Â K reaction temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 151, Issue 2, April 2006, Pages 128-134
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 151, Issue 2, April 2006, Pages 128-134
نویسندگان
H. Al-Kandari, F. Al-Kharafi, N. Al-Awadi, O.M. El-Dusouqui, A. Katrib,