掺杂Mn的Ce-Cu-K/Y催化剂制备及对甲苯燃烧的催化性能研究

Preparation of Mn-doped Ce-Cu-K/Y catalyst and its catalytic performance in toluene combustion

在氯化氢氧化Ce-Cu-K/Y催化剂研究基础上,以氯化氢废气中所含甲苯深度氧化燃烧为目标,通过掺杂Mn和改变K含量,采用浸渍法制备了Mny/Kx/Ce0.5Cu1.0/Y催化剂,考察了不同Mn及K元素含量对甲苯深度氧化燃烧性能的影响,研究了反应前后催化剂的结构变化。结果显示掺入Mn元素并改变K含量可显著提高甲苯的转化率,当x=y=0.6时催化剂的活性达到最大。反应过程中K元素形成的K2O及KMn8O16两种过渡态物种促进了氧化过程的电子转移,并有向催化剂表面迁移聚集的特征;反应后Y分子筛的孔结构没有发生改变。

Mny/Kx/Ce0.5Cu1.0/Y based on hydrogen chloride oxidation catalyst of Ce-Cu-K/Y are prepared by impregnation for combustion of toluene which is contained in hydrogen chloride waste gas and the effect of different content of Mn and K on combustion property of toluene are investigated. And the structural changes in fresh and used catalysts are also studied. The results show that conversion of toluene can be significantly enhanced by Mn-doping and changing potassium content in the catalyst, and the maximum catalytic activity is achieved at x = y = 0. 6. Two transition state species of potassium element, K2O and KMn8O16, formed in reaction facilitate the electron transfer in oxidation process and have the characteristics of migrating to catalyst surface. The pore structure of Y zeolite is unchanged after the reaction.