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Thermodynamic analysis of methane dry reforming: Effect of the catalyst particle size on carbon formation

机译：甲烷干重整的热力学分析：催化剂粒径对碳形成的影响

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The effect of catalyst particle size on thermodynamic equilibrium of methane dry reforming and carbon formation has been studied through the Gibbs free energy minimization method taking into account the deviation of carbon formed from graphite Gibbs energy and its dependence on catalyst particle size. Methane and CO2 conversions are maximized at low pressure and high temperature, and a molar H-2/CO ratio of 1 is obtained at 1100-1200 K and 5-10 bar. Carbon formation was found to increase with particle diameter, and carbon presence was noticed at conditions of high pressure/low temperature and high temperature/low pressure. Optimal operating conditions were found to be close to carbon limits, highlighting the need for active metal particle size to be less than 5-6 nm to minimize coking. CO was identified as the precursor for carbon at low temperature, while CH4 was found to be the main precursor at high temperature.
机译：通过吉布斯自由能最小化方法研究了催化剂粒度对甲烷干重整和碳形成的热力学平衡的影响，同时考虑了石墨吉布斯能量形成的碳的偏差及其对催化剂粒度的依赖性。在低压和高温下，甲烷和CO2的转化率最大，在1100-1200 K和5-10 bar下获得的H-2 / CO摩尔比为1。发现碳形成随粒径增加，并且在高压/低温和高温/低压的条件下注意到碳的存在。发现最佳操作条件接近碳极限，这突出表明需要使活性金属的粒径小于5-6 nm，以最大程度地减少焦化。 CO被确定为低温下碳的前体，而CH4被发现为高温下的主要前体。

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