铁矿石尾矿渣制备催化剂催化氧化甲醛

Catalytic Oxidation of Formaldelyde over the Catalysts Prepared by Iron Ore Tailings

采用浸渍法将废弃尾矿渣中的金属离子负载于?-Al2O3载体,焙烧制备催化剂,对其进行了表征,并于石英玻璃管固定床反应器中研究催化剂对甲醛的转化效率.结果表明,450℃焙烧所制载体?-Al2O3的结晶性好,Fe2O3在载体中分散程度高,比表面积为214.87 m2/g,而添加银离子改性后催化剂性能提高,比表面积增大为237.70 m2/g.450℃焙烧所制催化剂对甲醛的转化效率最高达67%,而掺杂银离子所制催化剂对甲醛的转化率提高10%以上;随反应温度升高,催化剂对甲醛的转化率提高,表明利用废弃铁矿石尾矿渣所制催化剂去除甲醛具有可行性.

The catalysts were prepared by loading metal ion of the iron ore waste tailings on --Al2O3 supporter by impregnation method and characterized, and their catalytic performance on the removal efficiency of formaldehyde was studied in a quartz glass fixed bed reactor. The results show that for the catalyst calcined at 450 ℃, the crystallinity of --Al2O3 supporter is good and Fe2O3 highly dispersed in the supporter with the specific surface area of 214.87 m2/g. While the performance of modified catalyst doping Ag＋ is improved with the specific surface area increased to 237.70 m2/g. The catalyst calcined at 450 ℃ has the highest formaldehyde conversion efficiency of 67%, which means the high catalytic activity. Furthermore, the doping of Ag＋ in catalyst can make the formaldehyde conversion efficiency raise over 10%. With the increase of reaction temperature, the conversion efficiency of formaldehyde increases accordingly. This indicates that it is feasible to use the catalyst prepared by iron ore tailings for removal of formaldehyde.