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Study of hydrogen surface mobility and hydrogenation reactions over alumina-supported palladium catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42981 45950 2008 8 PDF Available
Title
Study of hydrogen surface mobility and hydrogenation reactions over alumina-supported palladium catalysts
Abstract

Alumina-supported Pd catalysts with different particle surface densities have been prepared using incipient wetness impregnation of aqueous solution of a palladium nitrite complex. Buta-1,3-diene and orthoxylene hydrogenation reactions were performed both in a batch and a fixed bed reactor. Hydrogen surface mobility was studied using H2–D2 isotopic exchange. The influence of (i) the particle surface density and (ii) the surface area of the support on the catalytic properties are discussed. The turnover frequency (TOF) of the but-1,3-diene hydrogenation was highly sensitive to the surface density of Pd particles (Dsp). Moreover, for a given surface density, TOF also depend on the nature of the alumina support. For a given support, modifications of the electronic properties of palladium can explain the increase of the reaction rate with Dsp while changes in the kinetics of hydrogen surface diffusion are proposed to explain the support effect.

Graphical abstractAlumina-supported Pd catalysts with different particle surface densities have been prepared using incipient wetness impregnation of aqueous solution of a palladium nitrite complex. Buta-1,3-diene and orthoxylene hydrogenation reactions were performed both in a batch and a fixed bed reactor. Hydrogen surface mobility was studied using H2–D2 isotopic exchange. The influence of (i) the particle surface density and (ii) the surface area of the support on the catalytic properties are discussed. The turnover frequency (TOF) of the but-1,3-diene hydrogenation was highly sensitive to the surface density of Pd particles (Dsp). Moreover, for a given surface density, TOF also depend on the nature of the alumina support. For a given support, modifications of the electronic properties of palladium can explain the increase of the reaction rate with Dsp while changes in the kinetics of hydrogen surface diffusion are proposed to explain the support effect.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Highly dispersed Pd catalysts; Particle surface density; Butadiene hydrogenation; Orthoxylene hydrogenation; Surface mobility; H/D exchange
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Study of hydrogen surface mobility and hydrogenation reactions over alumina-supported palladium catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 346, Issues 1–2, 31 August 2008, Pages 36–43
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us