复合金属氧化物Cu-Co-Al低温催化水解HCN |
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引用本文: | 闫林霞,田森林,宁平,张秋林. 复合金属氧化物Cu-Co-Al低温催化水解HCN[J]. 中国环境科学, 2015, 35(10): 2964-2971 |
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作者姓名: | 闫林霞 田森林 宁平 张秋林 |
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摘 要: | 采用共沉淀法制备了Cu-Al、Co-Al和Cu-Co-Al复合金属氧化物催化剂,考察了3种催化剂对HCN的催化水解性能,并通过XRD、BET、XPS和H2-TPR等对催化剂的结构和性能进行表征.结果表明, Cu-Co-Al催化剂展示最高的催化活性. 反应温度200℃,反应180min后, Cu-Co-Al、Cu-Al和Co-Al催化剂对HCN的转化率分别为95%,90%,10%;NH3生成量分别为122,118,18mg/m3.低结晶度、高分散性、高比表面积的催化剂有利于低温HCN水解.适量的表面分子氧含量、较高的Cu2+和Co3+含量、较低的还原温度是Cu-Co-Al催化剂具有较高的HCN低温水解活性的主要原因.
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关 键 词: | HCN 复合金属氧化物 催化水解 催化剂 |
收稿时间: | 2015-02-09 |
Purification of HCN by catalytic hydrolysis over Cu-Co-Al complex metal oxide under lower temperature |
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Abstract: | Cu-Al, Co-Al and Cu-Co-Al complex metal oxide catalysts were prepared by co-precipitation to investigate catalytic hydrolysis performance of HCN gas. The catalysts were characterized by XRD, BET, XPS and H2-TPR to explore the structure and properties of catalysts. The results indicated that the Cu-Co-Al catalyst showed the best catalytic activity. When the reaction was kept for 180min at 200℃, the Cu-Co-Al、Cu-Al and Co-Al catalysts showed 95%, 90% and 10% HCN conversion, respectively. The corresponding concentration of NH3 was 122, 118, 18mg/m3. The excellent low-temperature hydrolysis of HCN was ascribed to its low crystallinity, high dispersion and large specific surface area. Besides, the appropriate amount of surface oxygen, the high Cu2+ and Co3+ content and the excellent redox ability were responsible for the superior low-temperature catalytic hydrolysis performance of HCN on the Cu-Co-Al catalyst. |
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Keywords: | hydrogen cyanide complex metal oxide catalytic hydrolysis catalyst |
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