n-Hexane hydroisomerization over Zr-modified bicontinuous lamellar silica mordenite supported Pt as highly selective catalyst: Molecular hydrogen generated protonic acid sites and optimization

被引：14

作者：

Ibrahim, M. ^{[1
,4
]}

Jalil, A. A. ^{[1
,2
]}

Zakaria, W. F. W. ^{[1
]}

Fatah, N. A. A. ^{[1
]}

Hamid, M. Y. S. ^{[1
]}

Izan, S. M. ^{[3
]}

Setiabudi, H. D. ^{[5
]}

机构：

[1] Univ Teknol Malaysia, Fac Chem Engn, Dept Chem Engn, Utm Johor Bahru 81310, Johor, Malaysia

[2] Univ Teknol Malaysia, Ctr Hydrogen Energy, Inst Future Energy, Utm Johor Bahru 81310, Johor, Malaysia

[3] Univ Teknol Malaysia, Fac Sci, Dept Chem, Utm Johor Bahru 81310, Johor, Malaysia

[4] Abubakar Tafawa Balewa Univ, Dept Chem Engn, PMB 0248, Bauchi, Bauchi State, Nigeria

[5] Univ Malaysia Pahang, Coll Engn Technol, Fac Chem & Proc Engn Technol, Kuantan 26300, Pahang, Malaysia

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2021年 / 46卷 / 05期

关键词：

RESPONSE-SURFACE METHODOLOGY; BEA ZEOLITE; Y ZEOLITE; HEPTANE ISOMERIZATION; SULFATED-ZIRCONIA; CARBON-DIOXIDE; POST-SYNTHESIS; PERFORMANCE; ADSORPTION; SPILLOVER;

D O I：

10.1016/j.ijhydene.2020.11.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Zr-modified bicontinuous lamellar silica mordenite supported Pt catalysts were synthesized using the zirconyl chloride oxahydrate as the precursor for Zr species by the incipient wetness impregnation method. The influence of zirconium loading on the properties of Zr-modified HM@KCC-1 catalysts for n-hexane isomerization were studied. The results of XRD and lattice structure from IR study indicated that increasing zirconium loading did not change the properties of catalysts. The IR study with pre-adsorbed 2,6-dimethylpyridine as a probe molecule affirmed that increasing zirconium loading could increase the Lewis acid sites. The generation of protonic acid sites which were active in n-hexane hydroisomerization was mainly from molecular hydrogen through a hydrogen spill-over mechanism as established by in situ-IR study. The results for the catalytic testing indicated that PtZr/HM@KCC-1 catalyst was highly selective in n-hexane hydroisomerization due to abundant permanent Lewis acid sites for its promotive effect in the generation of protonic acid sites. However, the incorporation of excessive zirconium amount up to 10 wt percent loading led to a decline in the amount of protonic acid sites generated, thus reduced the hydroisomerization performance in the process. The optimum conditions for hydroisomerization of n-hexane over Pt5Zr/HM@KCC-1 were reaction temperature of 293 degrees C, treatment temperature of 474 degrees C and F/W of 502 mL/g.min with the predicted value for isomer yield of 83.9%. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：4019 / 4035

页数：17

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