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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Selective removal of ethylene, a deposit precursor, from a dirty synthesis gas stream via gas-phase partial oxidation
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Selective removal of ethylene, a deposit precursor, from a dirty synthesis gas stream via gas-phase partial oxidation

机译：通过气相部分氧化从肮脏的合成气流中选择性去除乙烯（沉积物前体）

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A fundamental issue in the gasification of biomass is that in addition to the desired synthesis gas product (a mixture of H_2 and CO), the gasifier effluent contains other undesirable products that need to be removed before any further downstream processing can occur. This work assesses the potential to selectively remove hydrocarbons from a synthesis gas stream via gas-phase partial oxidation. Specifically, the partial oxidation of methane-doped, ethylene-doped, and methane/ethylene-doped model synthesis gas mixtures has been investigated at ambient pressures over a temperature range of 760-910 °C and at residence times ranging from 0.4 to 2.4 s using a tubular flow reactor. For the synthesis gas mixtures that contain either methane or ethylene, the addition of oxygen substantially reduces the hydrocarbon concentration while only a small reduction in the hydrogen concentration is observed. For the synthesis gas mixtures doped with both methane and ethylene, the addition of oxygen preferentially removes ethylene while the concentrations of methane and hydrogen remain relatively unaffected. These results are compared to the predictions of a plug flow model using a reaction mechanism that is designed to describe the pyrolysis and partial oxidation of small hydrocarbon species. The agreement between the experimental observations and the model predictions is quite good, allowing us to explore the underlying chemistry that leads to the hydrocarbon selective oxidation. The implications of these results are briefly discussed in terms of using synthesis gas to produce liquid fuels and electrical power via a solid oxide fuel cell.
机译：生物质气化中的一个基本问题是，除了所需的合成气产物（H_2和CO的混合物）外，气化器流出物还包含其他不良产物，需要进行进一步的下游处理之前将其除去。这项工作评估了通过气相部分氧化从合成气流中选择性去除碳氢化合物的潜力。具体而言，已在环境压力下，温度范围为760-910°C，停留时间为0.4至2.4 s的条件下研究了甲烷，乙烯和甲烷/乙烯掺杂的模型合成气混合物的部分氧化。使用管式流动反应器。对于包含甲烷或乙烯的合成气混合物，添加氧气会大大降低碳氢化合物的浓度，而观察到的氢浓度只有很小的降低。对于同时掺有甲烷和乙烯的合成气混合物，添加氧气优先除去乙烯，而甲烷和氢气的浓度相对不受影响。使用设计为描述小烃类物质的热解和部分氧化的反应机理，将这些结果与活塞流模型的预测结果进行了比较。实验观察结果与模型预测结果之间的一致性很好，这使我们能够探索导致烃选择性氧化的潜在化学反应。在使用合成气通过固体氧化物燃料电池生产液体燃料和电力方面，简要讨论了这些结果的含义。

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