کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62041 47618 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
La, V, and Fe promotion of Rh/SiO2 for CO hydrogenation: Effect on adsorption and reaction
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
La, V, and Fe promotion of Rh/SiO2 for CO hydrogenation: Effect on adsorption and reaction
چکیده انگلیسی

This study is a continuation of the research reported recently that showed La and V doubly promoted Rh/SiO2 catalysts to be active and selective for the synthesis of ethanol from syngas. In this work, the effect of Fe on Rh–La–V/SiO2 was examined and the role of each individual promoter was further scrutinized. Several series of promoted Rh/SiO2 catalysts were prepared by incipient wetness and characterized by BET, XRD, TEM, FTIR, TPR, and H2-TPD. The catalytic activity was tested using a fixed-bed differential reactor at 230 °C and 1.8 atm. It was found that the addition of 0.8 wt% Fe, 2.6 wt% La, and 1.5 wt% V to 1.5 wt% Rh/SiO2 resulted in the highest selectivity to ethanol (34.6%) and a moderate activity compared to other promoted catalysts. The investigation based on the catalytic performance and other characterizations of Rh/SiO2 promoted by different promoters suggests that the primary promoting effects of La, V, and Fe are different. The main effects of the addition of different promoters in this study appear to be increasing CO adsorption and insertion for La, decreasing CO adsorption but enhancing CO dissociation and chain growth for V, and decreasing CO adsorption but enhancing hydrogenation for Fe. The synergistic effects of the multiple promoters indicate that the key in catalyst design for ethanol synthesis from syngas is to optimize CO dissociation, hydrogenation, and CO insertion in a balanced way.

In this work, the effect of Fe on Rh–La–V/SiO2 was examined and the role of each individual promoter scrutinized with regard to its effect on CO hydrogenation.Figure optionsDownload high-quality image (69 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 267, Issue 2, 25 October 2009, Pages 167–176
نویسندگان
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