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The effect of preparation conditions on the properties of high-surface area Ni2P catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41867 45902 2010 16 PDF Available
Title
The effect of preparation conditions on the properties of high-surface area Ni2P catalysts
Abstract

The effect of preparation conditions on the properties of unsupported, high surface area Ni2P catalysts, prepared by adding citric acid (CA) to precursor metal salt solutions prior to drying, calcination and temperature-programmed reduction (TPR), is reported. The highest Ni2P surface area (∼220 m2/g) was obtained from a precursor solution with a P/Ni mole ratio of 2 and a CA/Ni mole ratio of 2 that was dried, calcined at 500 °C and reduced in H2 at 650 °C. Adding CA to the precursor salt solution is shown to yield amorphous precursors after calcination, rather than crystalline NiO and Ni2P4O12 that was observed in the absence of CA, and the amorphous material yielded high surface area Ni2P when reduced at temperatures above 600 °C. The high surface area Ni2P favored the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT) by the hydrogenation route, although some direct-desulfurization was observed on catalysts reduced at lower temperature in which significant metaphosphate species were identified.

Graphical abstractThe addition of citric acid (CA) to precursor metal and phosphate salt solutions produces an amorphous precursor after calcination, rather than crystalline NiO and Ni2P4O12 that was observed in the absence of CA, and the amorphous material yields high surface area Ni2P (∼220 m2/g) when reduced above 600 °C. The high surface area Ni2P favored the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT) by the hydrogenation route.Figure optionsDownload full-size imageDownload high-quality image (48 K)Download as PowerPoint slide

Keywords
Catalyst; Hydrodesulfurization; Nickel phosphide; 4,6-Dimethyldibenzothiophene; Citric acid; Catalyst preparation; Catalyst characterization
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The effect of preparation conditions on the properties of high-surface area Ni2P catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 380, Issues 1–2, 31 May 2010, Pages 149–164
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
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