IZM-2分子筛的制备及对长链烷烃加氢异构的催化性能

doi:10.7503/cjcu20170612

高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (4): 729.doi: 10.7503/cjcu20170612

IZM-2分子筛的制备及对长链烷烃加氢异构的催化性能

李传松¹, 杜燕燕²(), 薛虚智¹, 项宪政¹, 李久盛², 任天辉¹()

1. 上海交通大学化学化工学院薄膜与微细技术教育部重点实验室, 上海 200240
2. 中国科学院上海高等研究院绿色化学工程技术研究中心先进润滑材料实验室, 上海 201210

收稿日期:2017-09-08 出版日期:2018-04-10 发布日期:2018-03-26
作者简介:联系人简介: 杜燕燕, 女, 博士, 助理研究员, 主要从事加氢异构化催化剂方面的研究. E-mail:duyy@sari.ac.cn;任天辉, 男, 博士, 教授, 主要从事摩擦学方面的研究. E-mail:thren@sjtu.edu.cn
基金资助:
山西省科技厅重大专项(批准号: GJ 2016-01)资助

Preparation and Performance of Pt/IZM-2 Catalyst on the Hydroisomerization of n-Dodecane^†

LI Chuansong¹, DU Yanyan^2,^*(), XUE Xuzhi¹, XIANG Xianzheng¹, LI Jiusheng², REN Tianhui^1,^*()

1. School of Chemistry and Chemical Engineering, Key Laboratory for Thin Film and Microfabrication Technology of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
2. Advanced Lubricating Materials Laboratory, Green Chemical Engineering Technology Research Center,Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China

Received:2017-09-08 Online:2018-04-10 Published:2018-03-26
Contact: DU Yanyan,REN Tianhui E-mail:duyy@sari.ac.cn;thren@sjtu.edu.cn
Supported by:
† Supported by the Science and Technonlogy Major Projects of Shanxi Province, China(No.GJ 2016-01).

摘要/Abstract

摘要：

以反应体系中添加了阳离子表面活性剂十六烷基三甲基氯化铵的IZM-2分子筛为载体, 采用浸渍法制备了负载Pt的双功能催化剂, 并在连续微型固定床反应装置上考察了该催化剂对正十二烷加氢异构反应的催化性能. 扫描电子显微镜(SEM)和比表面积(BET)测试结果表明, 添加阳离子表面活性剂后, IZM-2分子筛颗粒的尺寸聚集效应得到一定程度的抑制, 介孔孔容和比表面积增加; 氨气程序升温脱附(NH₃-TPD)和氢气程序升温还原(H₂-TPR)表征结果表明, IZM-2分子筛添加阳离子表面活性剂后, Pt的还原性降低, 同时强酸位减少. 表面活性剂的加入使催化剂的介孔孔容和比表面积增大, 中强酸位减少, 从而抑制了裂化反应的发生, 致使IZM-2分子筛的加氢异构选择性提高, 异构烷烃的产率也有所提高.

关键词: IZM-2分子筛, 加氢异构化, 异构选择性, 双功能催化剂

Abstract:

IZM-2 added CTAC(cetyltrimethylammonium chloride) was synthesized by hydrothermal method. The bifunctional catalysts 0.5%Pt/IZM-2 were prepared via the incipient wetness impregnation technique, and their catalytic performance of the hydroisomerization of n-dodecane was investigated on the fixed-bed continuous-flow reactor. SEM and BET analysis prove the agglomeration weakening of the catalyst. NH₃-TPD and H₂-TPR results show the weaker reduction ability and fewer medium/strong acid sits of Pt/IZM-2-CTAC. The results showed that the aggregation effect of the IZM-2 particles is obviously inhibited after the addition of cation surfactants, and the mesoporous pore volume and specific surface area are increased, which provides more space for the diffusion of the reaction intermediates and shortens the residence time of the isomers in the pores. Thereby it surpresses the occurrence of the cracking reaction and increases the hydroisomerization selectivity as well as the yield of isoparaffins.

Key words: IZM-2 molecular sieve, Hydroisomerization, Isomerization, Selectivity, Bifuctional catalyst

中图分类号:

O643

TrendMD:

李传松, 杜燕燕, 薛虚智, 项宪政, 李久盛, 任天辉. IZM-2分子筛的制备及对长链烷烃加氢异构的催化性能. 高等学校化学学报, 2018, 39(4): 729.

LI Chuansong, DU Yanyan, XUE Xuzhi, XIANG Xianzheng, LI Jiusheng, REN Tianhui. Preparation and Performance of Pt/IZM-2 Catalyst on the Hydroisomerization of n-Dodecane^†. Chem. J. Chinese Universities, 2018, 39(4): 729.

图/表 9

Fig.1 XRD patterns of IZM-2 molecular sieves without(a) and with CTAC(b)

Fig.2 SEM images of IZM-2(A, B) and IZM-2-CTAC(C, D)

Fig.3 N2 adsorption-desorption isotherms of IZM-2(a) and IZM-2-CTAC(b)

Table 1 Physico-chemical properties of IZM-2 and IZM-2-CTAC samples

Sample	Surface area/(m²·g^-1)			Pore volume(cm³·g^-1)
Sample	$S a BET$	$S b micro$	$S c meso$	$V d total$	$V b micro$	$V c meso$
IZM-2	185	129	56	0.170	0.054	0.116
IZM-2-CTAC	324	214	110	0.370	0.133	0.237

Table 1 Physico-chemical properties of IZM-2 and IZM-2-CTAC samples

Sample	Surface area/(m²·g^-1)			Pore volume(cm³·g^-1)
Sample	$S a BET$	$S b micro$	$S c meso$	$V d total$	$V b micro$	$V c meso$
IZM-2	185	129	56	0.170	0.054	0.116
IZM-2-CTAC	324	214	110	0.370	0.133	0.237

Fig.4 H2-TPR curves of Pt/IZM-2(a) and Pt/IZM-2-CTAC(b)

Fig.5 NH3-TPD curves of IZM-2(a) and IZM-2-CTAC(b)

Fig.6 Activity of Pt/IZM-2(a) and Pt/IZM-2-CTAC(b) catalysts for the hydroisomerization of n-dodecane

Fig.7 Isomerization selectivity of Pt/IZM-2(a) and Pt/IZM-2-CTAC(b) catalysts for the hydroisomerization of n-dodecane

Fig.8 Isomer yields of Pt/IZM-2(a) and Pt/IZM-2-CTAC(b) catalysts for the hydroisome-rization of n-dodecane

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IZM-2分子筛的制备及对长链烷烃加氢异构的催化性能

Preparation and Performance of Pt/IZM-2 Catalyst on the Hydroisomerization of n-Dodecane^†

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IZM-2分子筛的制备及对长链烷烃加氢异构的催化性能

Preparation and Performance of Pt/IZM-2 Catalyst on the Hydroisomerization of n-Dodecane†

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Preparation and Performance of Pt/IZM-2 Catalyst on the Hydroisomerization of n-Dodecane^†