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Hydroisomerization of n-octane on molybdenum based catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
42008 45907 2010 8 PDF Available
Title
Hydroisomerization of n-octane on molybdenum based catalyst
Abstract

Balanced metal–acid bifunctional MoO2−x(OH)y catalytic system has been prepared. 2–3 monolayers of this phase on the sample surface were obtained following controlled reduction by hydrogen of equivalent 5 monolayers of MoO3 deposited on TiO2. Hydroisomerization reaction of n-octane on this Mo bifunctional phase, at similar experimental conditions to those employed in the case of nC5–nC7 hydrocarbons, produce branched species of relatively high octane numbers as compared to parent molecule, in contrary to Pt based catalysts in which hydrocracking reactions were observed. Bench scale catalytic experiments were carried out using 15 g catalyst under 5 bar hydrogen pressure, 25 SLPH, 0.4 h−1 LHSV and 623 K reaction temperature. Time on stream (TOS) experiments for several days did not show any changes in neither the conversion nor the isomerization selectivity. The stability and the resistance of the catalytic system towards poisoning by hydrocarbon species as well as its high performances towards n-octane hydroisomerization are attributed to its specific spatial geometry in which Mo atoms are present in alignment positions placed along the C-axis of the deformed rutile structure of MoO2 phase, as well as the moderate (metal–acid) functions strength of the surface MoO2−x(OH)y phase.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (17 K)Download as PowerPoint slideResearch highlights▶ Preparation and characterization of a bifunctional Mo based catalyst. ▶ Identification of the oxidation state of Mo and the presence of metallic and acidic functions by XPS-UPS techniques. ▶ Hydroisomerization of n-octane on this bifunctional Mo catalyst.

Keywords
MoO3; TiO2; Bifunctional catalyst; Isomerization of nC8; LHSV; TOS; Catalyst poisoning
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 383, Issues 1–2, 31 July 2010, Pages 141–148
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