固体超强酸催化剂SO4^2——MoO3—ZrO2中MoO3的作用与催化性能

根据固体超强酸催化剂ＳＯ４＾２－ＭｏＯ３－ＺｒＯ２的特点，结合活性评价结果，用ＢＥＴ、ＤＴＡ／ＴＧ、ＸＲＤ、ＬＲＳ等方法，对其进行了物性表征，考察了催化剂的结构形态、性质随催化剂组成的变化，以及催化剂的物性结构特点与催化活性的关系。研究结果表明，ＭｏＯ３含量对催化剂活性有着显著影响；催化剂的比表面积随ＭｏＯ３的含量变化存在极大值；ＭｏＯ３具有延迟ＺｒＯ２晶化、稳定ＳＯ４＾２－的作用，并提高了ＳＯ４

Role of MoO_3 in Solid Superacid Catalyst SO_4~(2-)-MoO_3-ZrO_2 and their Catalytic Performance

In accordance with the catalytic activity evaluation of the solid superacid catalyst SO 4 2- \|MoO 3\|ZrO 2, the catalysts are analyzed and characterized by BET, DTA/TG, XRD and LRS. The structure changes of the catalysts with MoO 3 contents and the relationship between properties and catalytic activity are also investigated. The results show that the MoO 3 content affects the catalytic activity greatly. The surface area of the catalysts changes with the MoO 3 content and has a maximum. MoO 3 has the effects to delay the crystallization of ZrO 2 and to stabilize SO 4 2- . When MoO 3 content is at the dispersing threshold, the improving effects of MoO 3 on the property of the catalysts are optimal, and the catalytic activity is the best.