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研究了用冶金废液制备的低温硫酸催化剂中铯、铷、锂等碱金属元素的助催化作用和熔盐用量对催化剂低温活性的影响 .结果表明 ,铯的低温助催化效果最好 ,其用量宜控制在n(Cs) /n(V) =0 .3～ 0 .6 .当n(Cs) /n(V) =0 .6时 ,410℃的SO2 转化率达 42 .5 % ,比无铯催化剂的SO2 转化率高 18.5 % .铷的加入会降低催化剂的低温活性 ,宜采取措施降低废液中的铷含量 .在多种碱金属元素混合使用的情况下 ,锂元素有较好的助催化作用 ,其最佳用量为n(Li) /n(V) =0 .4,410℃时SO2 转化率达 46 % .活性组分含量对催化剂低温活性和高温活性影响较大 ,n(M ) /n(V)宜小于 4.5 .
The effects of alkali metal elements such as cesium, rubidium and lithium on the low temperature sulfuric acid catalyst prepared from metallurgical waste liquid and the effect of molten salt dosage on the catalyst activity were investigated. The results showed that cesium had the best low-temperature cocatalytic activity, Should be controlled at n (Cs) / n (V) = 0 .3 ~ 0 .6. When n (Cs) / n (V) = 0.6, 410 ℃ SO2 conversion rate of 42.5% Cesium-based catalysts have a high SO 2 conversion of 18.5%. The addition of rubidium will reduce the low-temperature activity of the catalyst and measures should be taken to reduce the amount of rubidium in the effluent. In the case of mixed use of a plurality of alkali metals, (N) / n (V) = 0.4, the conversion rate of SO2 reaches 46% at 410 ℃ .The content of active component has a great influence on the low temperature activity and the high temperature activity of the catalyst, and n (M) / n (V) should be less than 4.5.