硅藻土磷酸盐催化剂制备过程组成的研究

STUDY OF DIATOMITEPHOSPHATE CATALYST COMPONENTS IN PREPARATION PROCESS

硅藻土磷酸盐催化剂制备过程组成的研究朱志荣言敏达陈永福姚亚平黄尔峰（中国石化总公司上海石油化工研究院，上海２０１２０８）关键词硅藻土，磷酸盐，催化剂组成，制备过程硅藻土磷酸盐是一种已在工业上应用于烯烃齐聚和苯烷基化等反应的固体酸［１］．催化作用机理研...

This paper describes the component variation of the diatomitephosphate catalyst in the whole preparation process. XRD, titration and ion chromatography were used for the characterization of catalyst components, and the ion chromatography was first developed and used to phosphate catalyst. The following results were obtained: BPO4 was formed in mixing and extruding of the catalyst, and it was stable in the whole preparation process of the catalyst; a little of Si(H2PO4)4 was formed at 160～240℃ for 3 h, with the reaction between polyphosphoric acid and diatomite; the SiP2O7 and Si3(PO4)4 were formed at 500～600℃ for 2 h, with the further reaction between polyphosphoric acid and diatomite, and Si(H2PO4)4 passed away; the hydrolysis of Si3(PO4)4 and SiP2O7 led to the increase of the freephosphoric acid, and the part of SiP2O7 changed into Si3(PO4)4 in steaming process.