Exhaust Gas Reforming of Methane in a Catalytic Microchannel Reactor
详细信息 查看全文
- 作者：Irem Sen ; Ahmet K. Avci
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2014
- 出版时间：February 5, 2014
- 年：2014
- 卷：53
- 期：5
- 页码：1760-1767
- 全文大小：329K
- ISSN：1520-5045
文摘
Oxidative steam reforming (OSR) of methane is investigated under exhaust gas reforming conditions in a wall-coated catalytic microchannel reactor. The process is run over different combinations of Pt- and Rh-based catalysts, namely 0.2% (by weight) Pt/Al2O3鈥?%Rh/Al2O3, 2%Pt/Al2O3鈥?%Rh/Al2O3, and 2%Rh/Al2O3鈥?%Rh/Al2O3. In each combination, coated catalysts are locked on the opposite walls of a rectangular microchannel to face each other. Parametric study is conducted in order to observe the effects of feed compositions (molar steam-to-carbon (H2O/C) and oxygen-to-carbon (O2/C) ratios) and temperature on methane conversion and on product distribution. The results show that methane conversion is enhanced with the increase in temperature and in the amounts of O2 and H2O in the feed stream. When the temperature is raised from 600 to 700 掳C, methane conversion is found to improve by ca. 25% in all catalyst configurations. Increasing H2O/C and O2/C ratios improved methane conversion at most by 7% and by 23%, respectively. H2 production also increased with temperature, with the highest increase of 5% is observed over the 2%Rh/Al2O3鈥?%Rh/Al2O3 combination. Higher O2/C ratios improved the extent of methane total oxidation but decreased H2 production. The catalyst combination involving 2% Rh/Al2O3 coated oppositely onto the inner walls of the microchannel is found to exhibit the best performance in terms of methane conversion and H2 and CO amounts in the product stream. A 10% increase in methane conversion is observed either by changing the Pt content from 0.2% to 2% or by replacing 2%Pt with 2%Rh. The results show that Rh is superior to Pt in terms of oxidation and steam reforming activities.