Solid-state reaction mechanism of ammonium molybdate with LaHY

被引：0

作者：

Zhang W. ^{[1
]}

Guo W. ^{[1
]}

Chu L. ^{[1
]}

Kong L. ^{[1
]}

Jin G. ^{[1
]}

机构：

[1] Department of Chemical Engineering, Beijing Institute of Petro-Chemical Technology, Beijing

来源：

Huagong Xuebao/CIESC Journal | 2016年 / 67卷 / 08期

关键词：

DBT; HDS; Single-phase complex; Solid-state reaction; TG-DSC;

D O I：

10.11949/j.issn.0438-1157.20160403

中图分类号：

学科分类号：

摘要：

Mass loss behavior in air and solid-state reaction mechanism of ammonium molybdate with LaHY were investigated by TG-DSC technique, and the physical structure, specific surface area, and surface acid sites by XRD, BET and NH3-TPD techniques. It showed that surface speicies of Mo arising from decomposition of (NH4)6Mo7O24·4H2O, over solid-state reaction of (NH4)6Mo7O24·4H2O with LaHY, allocates in LaHY molecular sieve cage as molybdenum-oxygen clusters to form a single-phase complex nMoOx·LaHY. The single-phase complex contributes to the lattice shrinkage, the reduced lattice parameter a0, and the decrease in specific surface area. The as-prepared nMoOx·LaHY possesses a slightly variation of weak acid center sites, an increase in medium strong acid center sites, a slightly decrease in strong acid center sites, and an increase in total acid sites, in comaprision with LaHY. The hydrodesulfulrization (HDS) performance of the single-phase complex nMoOx·LaHY was evaluated by using 0.6% (mass) dibenzothiophene(DBT)/decane as the representative reactants. The conversion of DBT in HDS process at 290℃ and 310℃ over nMoOx·LaHY catalyst with 5.0% (mass) of Mo loading, reached 56.38% and 88.79% under conditions of 4.0 MPa, 20 h-1 of space velocity and 500:1 of H2/oil volumetric ratio, which increased 12 and 28 percentage than that of MoO3/Al2O3 with 20% (mass) of Mo loading, respectively. The nMoOx·LaHY catalyst exhibited higher activity for DBT HDS reaction. © All Right Reserved.

引用

页码：3380 / 3386

页数：6

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