کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62249 47629 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
CO hydrogenation on lanthana and vanadia doubly promoted Rh/SiO2 catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
CO hydrogenation on lanthana and vanadia doubly promoted Rh/SiO2 catalysts
چکیده انگلیسی

This paper reports on a study of the combined promoting effect of La and V oxides for ethanol formation during CO hydrogenation on silica-supported Rh catalysts. Non-promoted and La and/or V oxide promoted Rh/SiO2 catalysts were prepared by sequential or co-impregnation methods and characterized by TEM, CO chemisorption and FT-IR. Their catalytic properties for CO hydrogenation were investigated using a differential fixed bed reactor at 230 °C and 1.8 atm. It was found that, compared to non-promoted Rh/SiO2, the singly promoted catalysts, Rh–La/SiO2 and Rh–V/SiO2, showed improved reactivity (3×) and better ethanol selectivities. However, the doubly promoted Rh–La–V/SiO2 catalysts exhibited even higher activity (9×) and selectivity for ethanol and other C2+ oxygenates, with the selectivity of total C2+ oxygenates >30% at these low pressure reaction conditions. The better performance of the Rh–La–V/SiO2 catalysts appears to be due to a synergistic promoting effect of the combined lanthana and vanadia additions through intimate contact with Rh. Use of just more of each promoter by itself was not able to produce the enhanced catalytic performance.

The combined promoting effect of La and V oxides for ethanol formation during CO hydrogenation on silica-supported Rh catalysts is reported.Figure optionsDownload high-quality image (21 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 262, Issue 1, 15 February 2009, Pages 119–126
نویسندگان
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