Performance of a catalytic plate reactor coated with different patterns of distributed layers of reforming and combustion catalysts is investigated for the endothermic methane steam reforming (MSR) coupled with the exothermic methane combustion to produce hydrogen. To simulate MSR, an experimentally validated surface microkinetic model for a nickel-based catalyst is implemented in reforming flow channels. Required thermal energy to the MSR sites is supplied by catalytic and gas-phase methane combustion (MC) carried out in the neighbouring parallel flow channels. To simulate combustion reactions, a reduced surface microkinetic model for the catalytic MC and power rate model for the gas-phase MC are implemented in combustion flow channels. The study considers two-dimensional domains for the coating layers of reforming and combustion catalysts and identifies the internal-diffusion limitations for the reforming-catalyst coating thicker than 50 μm and for the combustion-catalyst coating thicker than 5 μm. Results obtained for different patterns of distributed coatings of reforming and combustion-catalysts are evaluated against the results obtained for conventional continuous coating layers by comparing temperature distribution, conversion, yield, selectivity, H₂/CO ratio, efficiency, effectiveness-factor and plate-thickness. The study finds that by optimizing the distributed coating layers of the combustion-catalyst not only improves the utilization of both the catalysts and hydrogen production by 5% but also reduces the maximum plate temperature and axial thermal gradients along with 74% less combustion-catalyst compared to the continuous coating design. The study also finds that optimized distributed coating layers of both reforming and combustion catalysts predicts the similar methane conversion and hydrogen production as with the continuous coating layers for the same inlet molar feed rate but with 28% less reforming-catalyst and 74% less combustion-catalyst. Further, the study reports that the influence of distributed coatings of reforming and combustion catalysts is more pronounced in improving the performance of a catalytic plate reactor designed with relatively thick plate.

中文翻译：

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涂覆有重整和燃烧催化剂分布层的催化板反应器的改进性能，用于制氢

研究了吸热甲烷蒸汽重整（MSR）与放热甲烷燃烧相结合产生氢的，涂覆有不同样式的重整和燃烧催化剂分布层的催化板反应器的性能。为了模拟MSR，在重整流动通道中实施了镍基催化剂的经实验验证的表面微动力学模型。通过在相邻的平行流道中进行的催化和气相甲烷燃烧（MC），向MSR站点提供所需的热能。为了模拟燃烧反应，在燃烧流动通道中实现了催化MC的简化表面微动力学模型和气相MC的功率模型。该研究考虑了重整和燃烧催化剂涂层的二维域，并确定了重整催化剂涂层厚度大于50μm和燃烧催化剂涂层厚度大于5μm的内部扩散限制。通过比较温度分布，转化率，产率，选择性，H，与常规连续涂层获得的结果相比，评估了重整和燃烧催化剂分布涂层的不同图案获得的结果_2个/ CO比，效率，有效性因子和板厚。研究发现，通过优化燃烧催化剂的分布涂层，不仅将催化剂的利用率和制氢效率提高了5％，而且还降低了最高塔板温度和轴向热梯度，燃烧催化剂则减少了74％进行连续涂层设计。研究还发现，对于相同的进口摩尔进料速度，重整催化剂和燃烧催化剂的优化分布涂层预测的甲烷转化率和产氢量与连续涂层相似，但重整催化剂减少了28％，燃烧减少了74％。催化剂。进一步，