柠檬酸对NiMo/γ-Al2O3催化剂中助剂Ni作用的影响

石油炼制与化工 ›› 2018, Vol. 49 ›› Issue (10): 52-57.

柠檬酸对NiMo/γ-Al2O3催化剂中助剂Ni作用的影响

户安鹏,陈文斌,龙湘云,韩伟,张乐,聂红

中国石化石油化工科学研究院

收稿日期:2018-02-07 修回日期:2018-04-25 出版日期:2018-10-12 发布日期:2018-10-29
通讯作者: 聂红 E-mail:niehong.ripp@sinoepc.com
基金资助:
国家重点研发计划项目

EFFECT OF CITRIC ACID ON ROLE OF PROMOTER Ni IN NiMo/γ-Al2O3 CATALYST

Received:2018-02-07 Revised:2018-04-25 Online:2018-10-12 Published:2018-10-29
Supported by:

摘要/Abstract

摘要： 向一系列不同金属原子比[r=n(Ni)/n(Ni+Mo)]的NiMo/γ-Al2O3催化剂中引入柠檬酸，考察了柠檬酸对NiMo催化剂加氢脱硫活性的影响，并采用XRD，XPS，HRTEM等表征手段，从活性金属分散性、硫化度、活性相比例以及活性相形貌等方面分析了柠檬酸对助剂Ni作用的影响。结果表明：在r<0.3时，柠檬酸对NiMo催化剂的加氢脱硫活性有促进作用，柠檬酸的引入提高了催化剂的硫化度和NiMoS活性相的比例，有利于形成片晶尺寸较小、堆叠层数较多的活性相，对Ni的助剂效应有小幅促进作用；但是当r≥0.3时，柠檬酸对NiMo催化剂的加氢脱硫活性基本没有促进作用，柠檬酸的引入并未明显改变NiMo催化剂的活性金属硫化度、NiMoS活性相比例以及活性相形貌，对Ni的助剂效应影响较小。

关键词: NiMo/γ-Al2O3, 柠檬酸, 金属原子比, 加氢脱硫, 助剂作用

Abstract: A series of NiMo/γ-Al2O3 catalysts with different metal atomic ratio (n(Ni)/n(Ni+Mo)) was prepared with or without citric acid (CA) as chelating agent. The effect of CA on the hydrodesulfurization activity of NiMo/γ-Al2O3 catalysts was studied. The catalysts were characterized by means of XRD, XPS, HRTEM techniques to inspect active metal dispersion, sulfidation extent, active phase morphology as well as active phase ratio. The results showed that when the metal atomic ratio is below 0.3, CA has a positive effect on the catalytic activity of NiMo/γ-Al2O3 catalysts; the sulfidation degree of Mo species and the ratio of NiMoS active phases are increased, which is in favor of forming active phases with smaller slab length and slightly higher stacking number, indicating a moderate positive influence on the role of Ni. However, when the atomic ratio is above 0.3, CA has little effect on the catalytic activity of NiMo/γ-Al2O3 catalysts. The effect of CA on the role of Ni is small due to the fact that CA almost has no influence on the dispersion of active metals, the sulfidation degree of Mo species, the ratio of NiMoS active phases, and the morphology of active phases.

Key words: NiMo/γ-Al2O3, citric acid, metal atomic ratio, hydrodesulfurization, promoter effect

中图分类号:

户安鹏陈文斌龙湘云韩伟张乐聂红. 柠檬酸对NiMo/γ-Al2O3催化剂中助剂Ni作用的影响[J]. 石油炼制与化工, 2018, 49(10): 52-57.

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