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Active site distribution analysis of hydrodenitrogenation catalyst using Fredholm integral equation

Paper ID Volume ID Publish Year Pages File Format Full-Text
42148 45912 2010 8 PDF Available
Title
Active site distribution analysis of hydrodenitrogenation catalyst using Fredholm integral equation
Abstract

A non-parametric analysis using the Fredholm integral equation of the first kind exploits the distribution of the catalytic active sites during the hydrodenitrogenation (HDN) of carbazole on nitrided and reduced 12.5% Mo/Al2O3 catalysts. The approach was combined with the reactivity data and the surface property measurements. The equation describes two kinds of active sites (Site 1 with a small rate coefficient and Site 2 with a high rate coefficient) on the catalysts. The 1173 K-nitrided catalyst had a high activity and large Site 1 population along with a very low population and the highest value of Site 2, while the treatment at 773 K with NH3 or H2 produced less Site 1 than Site 2. The 973 K-nitrided catalyst had the highest k2·x2 value of the four catalysts, showing that it was superior to the other catalysts for Site 2. Based on the reaction product selectivity, Site 1 of the nitrided catalyst was responsible for the hydrogenation of carbazole, while Site 2 was responsible for the C–N hydrogenolysis of perhydrocarbazole. The turnover frequency (carbazole disappearance rate divided by the CO adsorption) was correlated to the k1x1 value, but not to the k2x2 value, showing that Site 1 facilitated the HDN reaction controlled by the carbazole hydrogenation. The two sites and mechanism for the carbazole HDN are discussed.

Graphical abstractFredholm integral equation of the first kind gives the activity distribution of active sites: r(t)=∫h(t,k)f(k)dk, h(t,k)⁡=⁡exp(−tk)   and 11+kt.Figure optionsDownload full-size imageDownload high-quality image (72 K)Download as PowerPoint slide

Keywords
Carbazole; Fredholm integral equation; Hydrodenitrogenation; Mo nitride; Site distribution
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Active site distribution analysis of hydrodenitrogenation catalyst using Fredholm integral equation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 374, Issues 1–2, 1 February 2010, Pages 150–157
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