کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
170592 458402 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of pretreatment gases on the performance of WO3/SiO2 catalysts in the metathesis of 1-butene and ethene to propene
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Effect of pretreatment gases on the performance of WO3/SiO2 catalysts in the metathesis of 1-butene and ethene to propene
چکیده انگلیسی

Different gases were employed to pretreat WO3/SiO2 for the metathesis of 1-butene and ethene to propene. Air-pretreated WO3/SiO2 was inactive, whereas N2-, N2/H2-, and H2-pretreated WO3/SiO2 exhibited high 1-butene conversion and propene selectivity. Tetragonal WO3 and partially reduced WO2.92 were found to be the active phases/species, whereas monoclinic WO3 was inactive. N2/H2- and H2-pretreated WO3/SiO2 contained both W6+ and W5+ species (i.e., nonstoichiometric WO3−x). Air- and N2-pretreated WO3/SiO2 only contained monoclinic W6+ species (WO3) before the reaction. However, the used N2-pretreated WO3/SiO2 contained both W6+ and W5+ species, suggesting that the N2 pretreatment can facilitate the formation of some W5+ species during the reaction. This in situ partial reduction can activate the N2-pretreated WO3/SiO2 for the metathesis.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comptes Rendus Chimie - Volume 18, Issue 6, June 2015, Pages 644–653
نویسندگان
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