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Reaction of thiophene with mono- and bimetallic Ni–Co particles supported on γ-Al2O3 and HDS activities of obtained sulfides

Paper ID Volume ID Publish Year Pages File Format Full-Text
42404 45923 2009 6 PDF Available
Title
Reaction of thiophene with mono- and bimetallic Ni–Co particles supported on γ-Al2O3 and HDS activities of obtained sulfides
Abstract

Reaction between thiophene and M/γ-Al2O3 (20 wt.%, M = Ni, Co, 2Ni–Co and 2Co–Ni) was studied by thermal gravimetric analysis (TGA) and by sulfidation in a fixed bed microreactor. The samples were prepared by incipient wetness impregnation followed by drying and reduction in hydrogen flow at 450 °C. Formation of bimetallic particles in samples containing both Ni and Co was confirmed by HRTEM with EDX analysis. The reaction with thiophene (20 or 40 mbar) was done at 360 °C in hydrogen atmosphere. TGA of the reaction with thiophene revealed that the initial rate of sulfidation drops sharply when going from Ni/γ-Al2O3 to Co/γ-Al2O3 (by a factor of 40 under used conditions). It follows from the sulfidation in a fixed bed reactor that this difference can be attributed to a poor catalytic activity of metallic Co in thiophene hydrodesulfurization (HDS) and consequently much lower amount of produced H2S in comparison with Ni. Upon sulfidation the HDS activity of Ni-rich particles progressively decreases, while, surprisingly, that of Co-rich particles is enhanced so that after a complete sulfidation (confirmed by XRD and sulfur analysis) the catalytic activity of the obtained sulfides in thiophene HDS increases in the order: 2Ni–Co < Ni < 2Co–Ni < Co.

Graphical abstractIt is found that the rate of reaction of reduced Ni/Al2O3 with thiophene is higher by a factor of 40 than that of Co/Al2O3. The reason of this difference is shown to be a lower rate of thiophene decomposition on metallic Co. In contrast, after sulfidation the activity in thiophene HDS is better for supported Co sulfide.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Thiophene reactive adsorption; Thiophene hydrodesulfurization; Ni–Co mixed particles; Supported Ni; Supported Co
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Reaction of thiophene with mono- and bimetallic Ni–Co particles supported on γ-Al2O3 and HDS activities of obtained sulfides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 371, Issues 1–2, 15 December 2009, Pages 199–204
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