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Synthesis of a novel zeolite W and application in the catalyst for FCC gasoline hydro-upgrading

Paper ID Volume ID Publish Year Pages File Format Full-Text
54055 46994 2015 9 PDF Available
Title
Synthesis of a novel zeolite W and application in the catalyst for FCC gasoline hydro-upgrading
Abstract

•Novel zeolite W was firstly synthesized using solid silica-alumina microspheres.•The synthesis conditions of zeolite W were investigated systematically and optimized.•Zeolite W based catalyst exhibited better HDS and RON preservation performance.•The synergy between the texture and acidity of zeolites W/L improved the activities.

Zeolite W was synthesized via the hydrothermal crystallization method by using KOH as the potassium and alkaline source, and a kind of cheap solid silica-alumina microsphere as the unique silica and alumina sources. The effects of synthesis factors on the formation of zeolite W were systematically investigated. The corresponding CoMo/γ-Al2O3-L/W catalysts with different molar ratios of zeolite L/W were prepared for the hydro-upgrading of fluid catalytic cracking (FCC) gasoline. The as-synthesized zeolite W and catalysts were characterized by means of XRD, SEM, pyridine-FTIR, UV–vis DRS and nitrogen adsorption. When the ratio of zeolite W and L was 1:1 (Cat. 3), the catalyst exhibited the best catalytic performances for both hydrodesulfurization (HDS) and preserving research octane number (RON). The sulfur content of hydrogenated gasoline is 5.7 mg/L, and the loss of RON is only 1.22 units compared with the RON of feedstock. The catalysts containing the zeolite W and L showed the excellent performances for deep desulfurization, aromatization, isomerization and RON preservation in the hydro-upgrading process of full-range FCC gasoline. The synergy of zeolite W and zeolite L could adjust the functionality balance between the selective hydrogenation, aromatization and isomerization.

Graphical abstractA novel microporous zeolite W was successfully synthesized using low-cost solid silica-alumina microspheres to be the unique silica and alumina sources. The corresponding catalyst of CoMo/γ-Al2O3-L/W with the zeolites L/W (molar ratios 1:1) exhibited the best catalytic performances for both HDS (98.2%) and research octane number (RON) preservation (1.22 units loss), since the incorporation of zeolites W and L into the support improved the excellent balances of deep desulfurization, aromatization, isomerization and RON preservation ability in the hydro-upgrading process of full-range FCC gasoline.Figure optionsDownload full-size imageDownload high-quality image (255 K)Download as PowerPoint slide

Keywords
Synthesis; Zeolite W; FCC gasoline; Hydro-upgrading; Catalysts
First Page Preview
Synthesis of a novel zeolite W and application in the catalyst for FCC gasoline hydro-upgrading
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 245, 1 May 2015, Pages 163–171
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis