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Abstract：
Preventing emission of pollutants in any kind, is a way to protect global environment. The objective of this study is to develop cobalt catalysts supported on alumina for the conversion of the toxic gas SO2 into elemental sulfur using methane. Although several useful catalysts have been proposed, there is still a need to synthesize a catalyst with a high sulfur yield that is also persistent during on-stream stability. To this end, four different catalysts were prepared using the wet impregnation technique, with Co3O4 content ranging from 0 to 15 wt%. Catalytic activity tests were carried out at atmospheric pressure and temperatures ranging from 550 to 800 °C. The Al2O3-Co (15 %) catalyst exhibited superior performance, with a sulfur yield of 98.1 % at 750 °C. The catalytic stability of the best catalyst was examined using a 20 h on-stream stability test under the optimized conditions including an SO2/CH4 molar feed ratio of 2 at 750 °C. The structural changes of the used catalyst after the stability test were investigated using XRD and TPO analyses. It was revealed that sulfidation of Co3O4 after a short while, results in decreasing the sulfur yield from 98.1 % to 89.8 %.
摘要：
防止排放任何种类的污染物，是保护全球环境的一种方式。这项研究的目的是开发负载在氧化铝上的钴催化剂，用于使用甲烷将有毒气体SO2转化为元素硫。尽管已经提出了几种有用的催化剂，仍然需要合成具有高硫产率的催化剂,其在运转稳定性期间也是持久的。为此,使用湿法浸渍技术制备了四种不同的催化剂，Co3O4含量范围为0至15重量%。在大气压和550至800°C的温度下进行催化活性测试。Al2O3-Co(15%)催化剂表现出优越的性能,在750°C时的硫收率为98.1%。在包括SO2/CH4摩尔进料比为2的优化条件下，在750°C下，使用20小时的在线稳定性测试检查最佳催化剂的催化稳定性。使用XRD和TPO分析研究了稳定性测试后所用催化剂的结构变化。这表明Co3O4的硫化在短时间后，结果硫产率从98.1%降至89.8%。
