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采用程序升温脱附(TPD)和程序升温电导(TPEC)两个平行的测量方法以及红外(IR)研究了TiO_2对H_2S/SO_2作用过程中化学和电导特性的变化。发现TiO_2可和H_2S、SO_2发生化学反应,Al_2O_3则不能。在大于200℃时,H_2S在TiO_2上可转化为S、H_2O和SO_2,SO_2可被氧化为SO_3。有趣的是,在经预还原处理的TiO_2上,H_2S可分解生成H_2,SO_2可被还原为S。在转化过程中,TiO_2本身的电导发生相应的变化。另外,H_2S和SO_2在TiO_2上比在Al_2O_3上容易脱附,不易发生硫酸盐化,因此,TiO_2在Claus反应中比Al_2O_3催化剂有更优良的催化性能与TiO_2中钛的变价有关。
Two parallel measurements of temperature programmed desorption (TPD) and temperature programmed conductance (TPEC) and infrared (IR) studies of the chemical and electrical conductivity of TiO 2 on H 2 S / SO 2 were carried out. It was found that TiO_2 could react with H_2S and SO_2, but not with Al_2O_3. Above 200 ℃, H_2S can be converted to S, H_2O and SO_2 on TiO_2, and SO_2 can be oxidized to SO_3. Interestingly, on pretreated TiO 2, H 2 S decomposes to generate H 2, and SO 2 can be reduced to S. During the conversion process, the conductance of TiO 2 changes accordingly. In addition, H 2 S and SO 2 were easier to desorb on TiO 2 than Al 2 O 3, and sulfation was not easy to occur. Therefore, the superior catalytic performance of TiO 2 over Al 2 O 3 catalyst in Claus reaction was related to the price change of titanium in TiO 2.