摘要
本文在研究汾西矿业公司炼焦煤尾煤基础性质的基础上,采用固定床反应器主要进行了贺西矿尾煤的催化热解试验。首先选取14种不同的金属氧化物作为催化剂,进行尾煤的催化热解,在此技术上筛选出六种活性较高的氧化物使用浸渍法制成了负载型金属氧化物催化剂,包括NiXOY、AgXOY、CrXOY、CoXOY、CuXOY和FeXOY/γ-Al2O3。重点探讨了氧化物的负载量、浸渍时间和焙烧温度等因素对催化剂性质的影响。结果表明,负载型催化剂对尾煤催化热解的气体产量以及气相中的氢气含量有明显影响,特别是NiXOY/γ-Al2O3的催化效果最好,氢气产量提高达60%以上。进一步采用分步浸渍法制成了双金属氧化物负载型催化剂,其催化热解制氢效果更为明显,其中MgO-NiO/γ-Al2O3可使氢气产量提高68%,CaO-NiO/γ-Al2O3勺催化效果次之,此外研究发现,双金属氧化物负载型催化剂的外形结构,还对催化剂的催化性能有一定的影响。与此同时,还对尾煤热解焦进行了性质分析和燃烧性能测定。本研究将为炼焦煤尾煤的综合利用,提供一条可供选择的途径。
Catalytic pyrolysis of Fenxi coking coal tailings was carried out with a fixed-bed reactor on the basis of investigating basic characeristics of the coal tailings.14kinds of metal oxides were selected as catalysts to pyrolyze coal tailings to study pyrolytic properties.6types of high activity metal oxides supported catalysts were prepared with a incipient wetness impregnation method, like NixOY、AgxOY、CrXOY、CoXOY、CuXOY and FeXOY. NiXOY/Y-Al2O3. It deals with the effects of loading of active matter, calcination temperature, and impregnation time upon catalytic activity of the catalysts. It gives good performance of metal oxide/γ-Al2O3in catalytic pyrolysis of cocking coal tailings to produce gases, especially to produce hydrogen. Here, catalysts of NiXOY/γ-Al2O3shows best activity in pyrolysis of coal tailing to produce hydrogen. Hydrogen yield increases by60%. Then, double layer metal oxide supported catalysts were further prepared by impregnating active matter on γ-Al2O3in step. Two catalysts like MgO-NiO/γ-Al2O3and CaO-NiO/γ-Al2O3were prepared. Catalytic activity of the catalysts takes much improvement in this way. Hydrogen yield increases about68%in pyrolysis of coal tailings, and CaO-NiO/γ-Al2O3also gives good performance in the pyrolysis. Furthermore, it finds that structure of the catalyst also takes effects upon catalytic activity in pyrolysis of coal tailing. In the mean time, proximate, ultimate and calorifc value of pyrolytic char were carried out in the experiment to understand char characteristics and utilizatio. Overally, results of this paper is possible to find a way for efficient utilization of coking coal tailings in Fenxi Coal Industry Company.
引文
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