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Effect of citric acid on the synthesis of tungsten phosphide hydrotreating catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42507 45928 2009 5 PDF Available
Title
Effect of citric acid on the synthesis of tungsten phosphide hydrotreating catalysts
Abstract

The effect of using citric acid in the synthesis of unsupported tungsten phosphide (WP) hydrotreating catalyst was investigated by synthesizing WP using varying amounts of citric acid. Catalyst characterization was done using nitrogen physisorption, CO chemisorption, X-ray diffraction (XRD), temperature-programmed reduction (TPR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The activities of the catalysts were tested on a high pressure kinetics rig using the hydrodenitrogenation of pyridine as a test reaction. The use of citric acid in the preparation resulted in smaller WP particles—1–10 μm versus >100 μm when no citric acid was used. The characterization results suggest that the citric acid formed complexes with the W ions and limited the agglomeration of these ions during calcination. The smaller WP particles were more active catalysts for pyridine conversion on both per volume and per site basis.

Graphical abstractThe effect of using citric acid in the synthesis of unsupported tungsten phosphide (WP) hydrotreating catalysts was investigated by synthesizing WP using varying amounts of citric acid. The SEM images below show WP particles prepared without (left) and with a 1:4 W:citric acid ratio (right). Increasing the amount of citric acid present in the preparation significantly reduced the particle size, increased the surface area, pore volume and CO uptake. In addition, the smaller particles were more active for pyridine conversion at 320 °C and 1.72 MPa.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Tungsten phosphide; Citric acid; Chelating agent; Physisorption; Pulse titration; Pore volume; Hydrodenitrogenation; Pyridine
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Effect of citric acid on the synthesis of tungsten phosphide hydrotreating catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 368, Issues 1–2, 31 October 2009, Pages 127–131
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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