氧化铝表面Ti修饰对负载金属Mo分散性能的影响

石油炼制与化工 ›› 2017, Vol. 48 ›› Issue (3): 75-80.

氧化铝表面Ti修饰对负载金属Mo分散性能的影响

郭长友,沈智奇,凌凤香,王少军,张会成

中国石化抚顺石油化工研究院

收稿日期:2016-09-07 修回日期:2016-10-27 出版日期:2017-03-12 发布日期:2017-02-24
通讯作者: 郭长友 E-mail:cyguo4321@aliyun.com
基金资助:
中国石油化工股份有限公司合同项目

EFFECT OF TI MODIFIED ALUMINA SURFACE ON DISPERSION OF SUPPORTED Mo

Received:2016-09-07 Revised:2016-10-27 Online:2017-03-12 Published:2017-02-24
Supported by:

摘要/Abstract

摘要： 分别用扫描透射-高角环形暗场像（HAADF-STEM）和高分辨电子显微技术（HREM）表征了氧化态和硫化态Mo/Al2O3,Mo/6%TiO2-Al2O3，Mo/12%TiO2-Al2O3催化剂中MoO3颗粒尺寸和MoS2片晶的层数与长度，发现氧化态催化剂中MoO3颗粒的平均尺寸从Ti修饰前的0.7 nm增加到修饰后的1.0 nm；硫化态催化剂中MoS2片晶的平均层数从1.1增加到1.2，平均长度从3.0 nm增加到3.2 nm。并从金属-载体相互作用理论解释了其形成机理。基于以上结果，根据MoO3颗粒和MoS2片晶中钼原子数变化，研究了催化剂硫化过程中金属晶粒的生长演变过程。

关键词: TiO2修饰, Al2O3表面, 扫描透射-高角环形暗场像, 高分辨电子显微技术, 金属分散性

Abstract: High angle annular dark field–scanning transmission electron microscopy (HAADF-STEM) and high resolution electron microscopy (HREM) techniques were used to study the size of MoO3 and the average length and layer numbers of MoS2 slabs after sulfidation, respectively, in Mo/Al2O3, Mo/6%TiO2-Al2O3 and Mo/12%TiO2-Al2O3 catalysts. It is found that TiO2 modification makes the size of MoO3 particle increases from 0.7 nm to 1 nm in oxidized catalyst, the average layer numbers of MoS2 increases from 1.1 to 1.2 layers in sulfided catalyst, while the length increases from 3 nm to 3.2 nm. These phenomena could be well explained by the theory of metal-support interaction (MSI). Based on above results, the transformation from MoO3 particles to MoS2 slabs was investigated according to the change of Mo atom numbers in each crystal.

Key words: TiO2 modification, Al2O3 surface, high angle annular dark field–scanning transmission electron microscopy, high resolution electron microscopy, metal dispersion

中图分类号:

郭长友沈智奇凌凤香王少军张会成. 氧化铝表面Ti修饰对负载金属Mo分散性能的影响[J]. 石油炼制与化工, 2017, 48(3): 75-80.

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