Co-Ce共掺杂对TiO_2催化剂室温可见光催化脱硝性能的影响

将钛酸丁酯作为Ti源,硝酸铈作为Ce源,硝酸钴作为Co源,采用溶胶-凝胶水热法制备出Ce-TiO_2和Ce-Co-TiO_2催化剂。对所制备的改性TiO_2催化剂进行BET、XRD、SEM、UV-vis、XPS、NH_3-TPD等表征分析测试,并以NO为研究对象对不同改性TiO_2催化剂进行了可见光催化实验,探究改性TiO_2催化剂脱除NO的效率。结果表明,以硝酸铈为Ce源(掺杂物质的量比1%),硝酸钴为Co源(掺杂物质的量比5%),在水热反应温度为160℃的条件下反应24 h后在200℃下煅烧得到的Ce(1%)-Co(5%)-TiO_2催化剂性能最好。其对浓度为762μg/m~3的NO可见光催化效率高达92.69%,在浓度提高至1148μg/m~3时在室温下的可见光催化效率仍可达85.94%,与纯TiO_2相比效率提高了近50%。而且Ce (1%)-Co (5%)-TiO_2催化剂的抗硫性能与连续使用次数都比商用催化剂(掺杂有V_2O_5的商用TiO_2)好。

Influence of Co-Ce co-doping on photocatalytic DeNOx of TiO2 catalyst at room temperature

Ce-TiO₂ and Ce-Co-TiO₂ powders were prepared by the sol-gel hydrothermal method with butyl titanate as the source of Ti, cerium nitrate as the source of Ce, cobalt nitrate for Co source. The modified TiO₂ catalysts were characterized with BET, XRD, SEM, UV-vis, XPS and NH₃-TPD. The NO reduction efficiency by visible light over the modified TiO₂ catalysts was carried out. The experimental results show that the catalyst Ce (1% molar)-Co (5% molar)-TiO₂ prepared under the conditions of 24 h hydrothermal synthesis at 160 and 200 ℃of calcination showed the best performance. At room temperature, the visible light catalytic efficiency of the catalyst reached 92.69% when the NO initial concentration was 762 μg/m³. When the NO initial concentration was 1148 μg/m³, the visible light catalytic efficiency could still reach 85.94%, which was improved by nearly 50% compared with pure TiO₂. Moreover, it was found that in the resistance of SO₂ and continuous usage, the efficiency of the Ce (1%)-Co (5%)-TiO₂ catalyst was better than the commercial catalysts (TiO₂ with V₂O₅ doping).