【作者】 方磊；

【导师】 张永春；

【作者基本信息】 大连理工大学 ， 工业催化， 2007， 硕士

【摘要】 纯的羰基硫（又称氧硫化碳，Carbonyl Sulfide，COS）是一种无色无味的气体，而且易燃易爆，它的存在容易腐蚀设备，污染空气，它还会生成硫化氢而产生具有臭鸡蛋气味的恶臭气体对人的身心健康造成威胁等。它普遍存在的浓度虽然很低，但却很难脱除，而且对它的脱除量也很有限，所以脱除低浓度羰基硫是很具有实际意义的。本论文根据本课题的背景用活性炭纤维（Activated Carbon Fibre，ACF）作为脱硫剂，从三个不同角度对活性炭纤维脱除低浓度的羰基硫进行了深入的研究，其主要内容如下：1．过渡金属改性ACF脱除低浓度COS的研究研究了Co²⁺、Ni²⁺、Fe³⁺、Cu²⁺、Zn²⁺等过渡金属离子浸渍改性活性炭纤维脱除COS的性能。考察了改性离子的种类、含量、原料气的伴生组分、反应气氛、反应相对湿度和温度对脱硫性能的影响。结果表明：与空白ACF相比，过渡金属离子改性ACF可以有效地提高了活性炭纤维的硫容量。其中，用Co²⁺改性ACF的脱硫效果优于其它金属离子改性的ACF。并根据实验结果推测了过渡金属离子在活性炭纤维上脱除COS的吸附反应机理。2．用ACF同时脱除二氧化碳中COS与H₂S的研究考察了用NaOH、KOH、Na₂CO₃、K₂CO₃和Fe³⁺、Co²⁺等对ACF进行改性，并分别对脱除COS和H₂S的性能进行了测试。考察的重点主要是以N₂和CO₂为稀释气，对改性离子的种类、含量、反应气氛和吸附温度等的脱硫性能进行研究，而且还考察了在COS和H₂S同时存在的情况下ACF脱除COS和H₂S性能。结果表明：碱改性ACF比空白ACF脱除效果好，过渡金属离子改性ACF与碱改性ACF相比可以有效地提高了活性炭纤维的硫容量。其中，用Co²⁺改性ACF能同时提高脱除COS和H₂S的效果。3．用改性ACF脱除低浓度COS再生方法的研究分别用溶剂再生和气体热再生的方法对脱低浓度COS失活后的改性ACF进行再生。考察了再生后改性ACF的脱硫性能，主要研究再生时间、再生温度等因素对ACF再生效果的影响。实验结果表明：溶剂再生和气体热再生都是有效果。其中，溶剂法中用水再生效果较好；气体热再生中用N₂再生效果较好。更多还原

【Abstract】 Pure carbonyl sulfide（COS） is a kind of gas without odor and color. It even combusts and explodes easily and experiment are likely to be eroded by it so that the pipelines are often blocked. Tail gas and other gases containing it would pollute the air terribly and it can transform a kind of mephitic gas hydrogen sulfide with rotten-eggs odor which is harm to humans. Although its concentration is lower, it can’t be removed easily. Thus, to remove low concentration COS is an important issue.On the basis of background of this paper, three aspects about how to remove low concentration COS with ACF have been studied. The main contents were listed as follows:1. A study of removal of low concentration COS by using modified ACF containing transitional metalsThe activated carbon fibres were modified with some transitional metal ions such as Co²⁺, Ni²⁺, Fe³⁺, Cu²⁺, Zn²⁺ by the impregnation method. Some factors which maybe affect the performance of removing carbonyl sulfide such as the kinds and the concentration of transitional metal ions, the components of feed gas, condition of reaction, relative humidity and the temperature were investigated on the fixed-bed reactor. It was showed that the activated carbon fibres modified with Co²⁺ had a higher sulfur capacity than the others. And the mechanism of removal carbonyl sulfide with transitional metal ions was deduced.2. The research of simultaneous removing COS and H₂S using ACF in feedstock of CO₂The activated carbon fibres were modified with some alkali and ions such as NaOH、KOH、Na₂CO₃、K₂CO₃ and Co²⁺、Fe³⁺ by the impregnation method and some factors which maybe affect the performance of removing COS and H₂S such as the kinds and the concentration of alkali and metal ions, the components of feed gas, and the temperature of reaction were investigated on the fixed-bed reactor. It was showed that the modified activated carbon fibres had a higher sulfur capacity than the activated carbon fibres modified with alkali and the activated carbon fibres modified with metal ion had a higher sulfur capacity than other modified activated carbon fibres. In addition, the activated carbon fibres modified with Co²⁺ had a better impact of simultaneous removal of COS and H₂S than the others.3. A study of regeneration method for ACF modified using removing low concentration COSActivated carbon fibre used by removing low concentration COS were regenerated with solvent method and gas method respectively. During the course of regeneration, the effects of some factors which include the regeneration time and temperature were studied through investigating the performance of desulfuration of regenerated ACF. It was showed that solvent regeneration method and gas regeneration method were all effective regeneration methods. The regeneration method of water has better effective in solvent regeneration method and the regeneration method of nitrogen gas has better effective in gas regeneration method.更多还原