کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
145693 456347 2016 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Unsteady-state operation of supported platinum catalysts for high conversion of methane
ترجمه فارسی عنوان
عملیات حالت ناپایدار کاتالیزور پلاتین های پشتیبانی شده برای تبدیل بالای متان
کلمات کلیدی
عملیات راکتور گذرا؛ بهره وری کاتالیزور پیشرفته ؛ اکسیژن خود مسمومیت؛ فعال سازی متان
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Unsteady-state operation enhances catalytic processes.
• Promoting methane oxidation by transient operation.
• Utilisation of temporary states with high catalytic activity.

Total oxidation of methane over model monolith catalysts with platinum supported on alumina, alumina–ceria and ceria has been studied under unsteady-state operation of the feed gas stoichiometry. The general activity for methane oxidation follows the order Pt/alumina << Pt/alumina–ceria << Pt/ceria. Thanks to high catalytic activity at the gas composition switches, increased cycling frequency between oxygen excess and oxygen free conditions increases the average methane conversion significantly from 11% to 58% for Pt/alumina and from 25% to 87% for Pt/alumina–ceria. The corresponding stationary methane conversion is 10% and 19%, respectively. The underlying reason for the enhanced catalytic activity is likely twofold namely that periods with detrimentally high coverage of either oxygen or carbon are shortened and that the transients induce a highly active (chemical) state of the catalyst, thus, facilitating high average conversion of methane.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 292, 15 May 2016, Pages 321–325
نویسندگان
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