کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
61865 47609 2010 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of thiophene on the isooctane reforming activity of Ni-based catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Influence of thiophene on the isooctane reforming activity of Ni-based catalysts
چکیده انگلیسی

Catalytic reforming of liquid hydrocarbon fuels is challenging due to potential deactivation via carbon deposition and sulfur poisoning. To gain a better understanding of the effect of sulfur on the deactivation of Ni/Ce0.75Zr0.25O2 catalysts, isooctane conversion to syngas was studied in the presence of small amounts of thiophene under various O/C and H2O/C ratios representing steam reforming, partial oxidation, and autothermal reforming conditions. It was found that depending on the reaction conditions, thiophene underwent different degrees of desulfurization, leading to the formation of H2S. Under reaction conditions leading to nearly complete conversion of thiophene to H2S, the nickel catalyst lost only a small amount of its initial activity, but then maintained stable performance over longer times on stream. In contrast, reaction conditions under which thiophene emerged unconverted from the reactor led to severe and continued deactivation of the catalysts. Furthermore, co-feeding thiophene with isooctane caused significant increases in the temperature profile of the reactor and an increased amount of olefins were seen as products of the reaction, indicating that sulfur deactivated primarily catalyst sites responsible for endothermic steam reforming reactions, while having less impact on exothermic partial oxidation reactions. Controlling the reaction conditions in such a way as to generate sufficient hydrogen concentrations in the catalyst bed for effectively desulfurizing thiophene to H2S appears to be the key to maintain stable catalytic activities in the presence of sulfur compounds.

The performance of a Ni-based catalyst was studied under thiophene-exposed isooctane reforming at various O/C and H2O/C ratios. The reforming conditions have a strong influence on sulfur tolerance.Figure optionsDownload high-quality image (101 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 271, Issue 1, 12 April 2010, Pages 140–152
نویسندگان
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