Natural Gas Steam Reforming over Rhodium/Alumina Catalysts: Experimental and Numerical Study of the Carbon Deposition from Ethylene and Carbon Monoxide

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• 作者：Claudia E脽mann ; Lubow Maier ; Aijun Li ; Steffen Tischer ; Olaf Deutschmann
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：August 6, 2014
• 年：2014
• 卷：53
• 期：31
• 页码：12270-12278
• 全文大小：429K
• ISSN：1520-5045

文摘

Natural gas steam reforming (SR) over technically used rhodium/alumina (Rh/Al<sub>2sub>O<sub>3sub>) honeycomb catalysts is studied experimentally at temperatures between 923 and 1073 K and steam-to-carbon ratios (S/C) of unity, with regard to coke deposition caused by the decomposition of the product species ethylene (C<sub>2sub>H<sub>4sub>) and carbon monoxide (CO). Furthermore, the process is modeled using detailed reaction mechanisms, and numerical simulations are carried out to describe the coke formation on Rh/Al<sub>2sub>O<sub>3sub> catalysts quantitatively. The amount of deposited carbon was detected and analyzed for varying feed mixtures of the products CO and C<sub>2sub>H<sub>4sub> diluted in N<sub>2sub>. During the decomposition of CO, the saturation of the amount of coke is monitored by feeding CO in high concentrations. No saturation occurs for the same amounts of coke resulting from the decomposition of C<sub>2sub>H<sub>4sub>. The coking rate caused by the decomposition of C<sub>2sub>H<sub>4sub> is found to be 25 times higher than the coking rate caused by the decomposition of CO. The differences in coking behavior caused by C<sub>2sub>H<sub>4sub> and CO, respectively, are described by coking models.