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Improving the selectivity to HDS in the HDT of synthetic FCC naphtha using sodium doped amorphous aluminosilicates as support of CoMo catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40974 45873 2012 10 PDF Available
Title
Improving the selectivity to HDS in the HDT of synthetic FCC naphtha using sodium doped amorphous aluminosilicates as support of CoMo catalysts
Abstract

CoMo catalysts supported on sodium-doped amorphous aluminosilicates (ASA) with different Si/(Si + Al) ratios were prepared. The catalytic performance of these catalysts in the HDT of synthetic FCC naphtha was compared with the one of a CoMo catalyst supported on pure alumina, as well as with another one supported on sodium-modified alumina. The catalysts results were also compared with the ones of CoMo catalyst supported on ASA without sodium. The catalysts were characterized by XRF, XRD, Raman, as well as their textural and acid properties. The sodium introduction simultaneously with the variation of the Si/(Si + Al) ratio conducts to obtain a catalyst (15% Si/(Si + Al), 3 wt.% Na) with, on the one hand, an Mo oxide species distribution with an important participation of β-CoMoO4 crystalline species and, on the other hand, a selective formation of weak Brönsted acid sites. As a consequence of this especial balance between the acid properties and the oxidic Mo-surface-species distribution, this catalyst presented an activity similar to the one of the CoMo/Al2O3, but with improvements in the selectivity to HDS. Additionally, it was also encountered that when CoMo catalysts supported on materials of predominantly acidic nature are used, the linear olefins inhibit more the HDS activity than the branched ones, whereas the contrary effect was encountered when supports of a predominantly basic nature are used.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (149 K)Download as PowerPoint slideHighlights► It is possible to obtain HDS selective materials without losing the HDS activity. ► This was achieved by finely tuning the acid–base properties of CoMo catalysts. ► CoMo catalysts supported on sodium-modified aluminosilicates were used. ► Selective formation of weak Brönsted was observed in the best catalyst. ► β-CoMoO4 crystalline species were also obtained in the best catalyst.

Keywords
FCC naphtha; Selectivity to the HDS; Amorphous aluminosilicates; Hydrogenation of olefins; Acid properties
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Improving the selectivity to HDS in the HDT of synthetic FCC naphtha using sodium doped amorphous aluminosilicates as support of CoMo catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 421–422, 16 April 2012, Pages 48–57
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us