复合金属氧化物Cu-Co-Al低温催化水解HCN  

Purification of HCN by catalytic hydrolysis over Cu-Co-Al complex metal oxide under lower temperature

作　　者：闫林霞[1] 田森林[1] 宁平[1] 张秋林[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500

出　　处：《中国环境科学》2015年第10期2964-2971,共8页China Environmental Science

基　　金：国家"863"计划重点项目(2008AA062602);国家自然科学基金(21277064;U1137603;21307047);教育部科学研究研究重点项目(210202);云南省人培基金(14118682)

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.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 180 min 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.

关 键 词：HCN 复合金属氧化物 催化水解 催化剂 

分 类 号：X511[环境科学与工程—环境工程]