کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62046 47618 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhanced reactivity of direct propylene epoxidation with H2 and O2 over Ge-modified Au/TS-1 catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Enhanced reactivity of direct propylene epoxidation with H2 and O2 over Ge-modified Au/TS-1 catalysts
چکیده انگلیسی

The epoxidation of propylene with H2–O2 mixtures was studied over a gold catalyst supported on a Ge-modified TS-1 catalyst at 170 °C. Shifts of X-ray diffraction lines to lower angle showed that the Ge was incorporated into the structure of the TS-1. The presence of Ge more than doubled the conversion from 1.6% to 4% while increasing selectivity from 87% to 91%. Density functional theory calculations indicated that the origin of the enhanced activity was a ligand effect of Ge on Ti, which lowered the activation energy for the critical epoxidation step.

Gold supported on a Ge-modified TS-1 was active for propylene epoxidation, due to a ligand effect of Ge on Ti, which lowered the activation energy for the critical epoxidation step.Figure optionsDownload high-quality image (51 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 267, Issue 2, 25 October 2009, Pages 202–206
نویسندگان
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