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首页> 外文期刊>Energy Conversion & Management >Thermodynamic and experimental analysis on ethanol steam reforming for hydrogen production over Ni-modified TiO_2/MMT nanoclay catalyst
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Thermodynamic and experimental analysis on ethanol steam reforming for hydrogen production over Ni-modified TiO_2/MMT nanoclay catalyst

机译：Ni修饰的TiO_2 / MMT纳米粘土催化剂用于乙醇蒸汽重整制氢的热力学和实验分析

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Catalytic ethanol steam reforming (ESR) offers a sustainable and attractive route for hydrogen production, which can be utilized as a substitute for fossil fuels. ESR for hydrogen production involves complex reactions and yield of hydrogen depends upon several process variables such as temperature, molar feed ratio and pressure. In this study, a thermodynamics analysis coupled with experimentation for ESR toward hydrogen production has been investigated. The structured montmorillonite (MMT) nanoclay and TiO2 supported catalyst incorporated by nickel (Ni) was developed via a sol-gel and impregnation methods. The catalyst samples were characterized by XRD, FE-SEM, EDX, BET and TGA to understand crystallinity, surface morphology, pore structure and stability. Initially, thermodynamic analysis was employed to study the effect of reaction conditions on equilibrium product distribution of ESR. The equilibrium concentrations of different compounds were calculated by the method of direct minimization of the Gibbs free energy. Optimum conditions for ESR were found to be; atmospheric pressure, temperatures between 600 and 700 degrees C and steam to ethanol (S/E) feed molar ratio of 10:1, at which highest hydrogen can be produced with minimum coke formation. Next, catalytic performance of NiO/MMT-TiO2 catalyst for enhanced ESR for hydrogen production was conducted in a tubular fixed bed reactor at 500 degrees C and atmospheric pressure. Noticeably, Ni-promoted TiO2 NPs found efficient for selective hydrogen production, yet MMT-supported Ni/TiO2 gave much higher ethanol conversion with improved hydrogen yield. Using 12% Ni-10% MMT/TiO2 catalyst, ethanol conversion of 89% with H-2 selectivity and yield of 61 and 55%, respectively were obtained. The stability test revealed MMT-supported catalysts maintained activity even after 20 h. By comparing results, it was possible to explain deviations between thermodynamic analysis and experimental results regarding carbon deposition and selective hydrogen production.
机译：催化乙醇蒸汽重整（ESR）提供了一种可持续且有吸引力的制氢途径，可将其用作化石燃料的替代品。用于制氢的ESR涉及复杂的反应，氢气的产率取决于多个工艺变量，例如温度，摩尔进料比和压力。在这项研究中，对热力学分析以及ESR对制氢的实验进行了研究。通过溶胶-凝胶和浸渍法开发了结构化的蒙脱土（MMT）纳米粘土和由镍（Ni）掺入的TiO2负载型催化剂。通过XRD，FE-SEM，EDX，BET和TGA对催化剂样品进行表征，以了解其结晶度，表面形态，孔结构和稳定性。最初，通过热力学分析来研究反应条件对ESR平衡产物分布的影响。通过直接最小化吉布斯自由能的方法来计算不同化合物的平衡浓度。发现ESR的最佳条件是：大气压，600至700摄氏度之间的温度以及蒸汽与乙醇（S / E）的进料摩尔比为10：1，在此比率下，可以产生最高的氢气，而生成的焦炭最少。接着，在管式固定床反应器中在500℃和大气压下进行NiO / MMT-TiO 2催化剂的用于提高ESR用于制氢的催化性能。值得注意的是，发现Ni促进的TiO2 NPs对于选择性制氢是有效的，而MMT负载的Ni / TiO2却能提供更高的乙醇转化率和更高的氢产率。使用12％Ni-10％MMT / TiO2催化剂，乙醇转化率为89％，H-2选择性和产率分别为61和55％。稳定性测试表明，即使20小时后，MMT负载的催化剂仍保持活性。通过比较结果，可以解释关于碳沉积和选择性制氢的热力学分析与实验结果之间的偏差。

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