Mesoporous silica–alumina modified by acid leaching as support of Pt catalysts in HDS of model compounds

[Display omitted] ▶ Leaching of non-acidic Al2O3 from mesoporous silica–alumina carrier (50% Al2O3) by HNO3 increased the BET area, proportion of AlTET and exposed strong acidity. ▶ This improved the HDS activity of Pt catalysts prepared from such modified carriers. ▶ The best catalyst with 1.5% Pt...

Full description

Saved in:
Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2010-10, Vol.100 (3-4), p.463-471
Main Authors: Vít, Zdeněk, Gulková, Daniela, Kaluža, Luděk, Bakardieva, Snejana, Boaro, Marta
Format: Article
Language:English
Subjects:
Acid leaching
Aluminum oxide
Benzothiophene
Catalysis
Catalysts
Chemistry
Colloidal state and disperse state
Dispersions
Exact sciences and technology
General and physical chemistry
Hydrodesulfurization
Ion-exchange
Mesoporous silica–alumina
Platinum
Porous materials
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Thiophenes
Zeolites: preparations and properties
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] ▶ Leaching of non-acidic Al2O3 from mesoporous silica–alumina carrier (50% Al2O3) by HNO3 increased the BET area, proportion of AlTET and exposed strong acidity. ▶ This improved the HDS activity of Pt catalysts prepared from such modified carriers. ▶ The best catalyst with 1.5% Pt was much more active in HDS of thiophene and benzothiophene than Pt/HY and industrial CoMo/Al2O3. The potential of mesoporous silica–alumina (MSA) modified by acid leaching as alternative support for Pt catalysts was studied in hydrodesulfurization (HDS) of thiophene and benzothiophene. The supports were characterized by N2 adsorption, XRD, 27AL MAS NMR, electron microscopy (SEM, HRTEM) and by activities in cyclohexene isomerization and cumene cracking. The composition of the catalysts and Pt dispersion were determined by ICP and H2 or CO sorption, respectively. Progressive leaching of the parent MSA from 50% Al2O3 to 11% Al2O3 content led to increase of the BET surface area and exposition of strong acidity. This positively affected the activities of the reduced Pt catalysts in thiophene HDS. Deposition of 1.5wt.% Pt on MSA (11% Al2O3) by using Pt(NH3)4(OH)2 as precursor gave the best catalyst, several times more active in thiophene HDS than the weight equivalents of sulfided CoMo/Al2O3 or reduced Pt/HY zeolite. In benzothiophene reaction, its activity was slightly above that of CoMo/Al2O3 and about twofold compared to Pt/HY.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2010.08.022