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首页> 外文期刊>Catalysis science & technology >Investigation on the simultaneous removal of COS, CS2 and O-2 from coke oven gas by hydrogenation on a Pd/Al2O3 catalyst
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Investigation on the simultaneous removal of COS, CS2 and O-2 from coke oven gas by hydrogenation on a Pd/Al2O3 catalyst

机译：同时删除因为调查通过加氢CS2和0 2从焦炉煤气Pd /氧化铝催化剂

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摘要

The present study deals with the processing of coke oven gas mainly composed of H-2, CH4, N-2 and CO to provide a feedstock for the synthesis of base chemicals. In this respect, the particular focus of this work is the simultaneous reduction of critical trace components like COS, CS2 and O-2 by catalytic reaction with H-2. The investigations were performed in synthetic coke oven exhaust using a Pd/Al2O3 catalyst. The results of the hydrogenation tests showed complete conversion of COS, CS2 and O-2 at 200 degrees C and above with selective formation of H2S. However, below 200 degrees C the conversion of O-2 was markedly reduced and CH3SH appeared as a by-product. Mechanistic studies were performed by in situ diffuse reflectance infrared Fourier transform spectroscopy coupled with mass spectrometry. These investigations demonstrated dissociative adsorption of COS on the catalyst at 150 degrees C resulting in the formation of bridged CO adsorbates and probably elemental sulfur. It is assumed that these species predominate the active Pd surface under reaction conditions. Consequently, the adsorption of O-2 and the reaction to H2O is suppressed thus substantiating the decrease in performance at low temperatures. However, increasing the temperature to 200 degrees C and above leads to desorption of CO and sulfur compounds restoring the efficiency of the catalyst.
机译：本研究涉及的处理焦炉煤气主要由h2、CH4、n -和公司提供的原料合成基础化学品。特别关注的是同时工作减少关键跟踪组件,如因为CS2和2 0 2通过催化反应。调查进行合成可口可乐炉排气使用Pd /氧化铝催化剂。加氢试验表明的结果因为的完整转换,CS2,在200 0 2度或以上程度,选择性的形成硫化氢。0 2明显减少和CH3SH出现一个副产品。通过原位漫反射红外傅里叶变换光谱学加上质量谱分析。因为的解离吸附的催化剂150摄氏度的形成可能架桥吸附物和元素硫磺。支配活动Pd表面下的反应条件。和水的反应是抑制充实的减少性能较低温度。到200摄氏度以上的解吸公司和硫化合物恢复效率的催化剂。

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