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Preparation of Pdshell–Aucore/SiO2 catalyst and catalytic activity for acetylene hydrogenation

Paper ID Volume ID Publish Year Pages File Format Full-Text
43289 45962 2008 7 PDF Available
Title
Preparation of Pdshell–Aucore/SiO2 catalyst and catalytic activity for acetylene hydrogenation
Abstract

Various Pd shell thicknesses (0.12–1.5 nm) were synthesized on preformed Au particles of 5 nm size by seeded growth technique (15–80 at% Pd) using sodium citrate and tannic acid. The sols were characterized by UV–vis spectroscopy, TEM and high-resolution TEM (HRTEM) measurements. HRTEM confirmed the pseudomorphic growth of the Pd shell on the Au core. The Au/Pd core/shell particles were fixed onto SiO2 (Aerosil 200) support by PDDA polycation. The catalytic activity in acetylene hydrogenation and selectivity of competition between acetylene and propene were tested after O2 and H2 pretreatment. The samples even in “as prepared” state hydrogenated acetylene. The thin Pd layer (15–30 at% Pd) on Au provided higher hydrogenation activity than the thick Pd shell. However, thermal treatment of the samples in H2 stream causing Au/Pd intermixing shifted the activity maximum to higher Pd concentration (68–80 at% Pd). Comparison of the TOF (1/s) and selectivity values allowed us to conclude that the homogenized particle with 68–80 at% Pd shows better hydrogenation activity and selectivity than the thin Pd shell (15–30 at% Pd) on the Au core.

Graphical abstractPd shell of various thicknesses was synthesized on preformed Au core of 5 nm. The Au/Pd sols were fixed to SiO2 by PDDA polycation and hydrogenation of acetylene in propene was tested. The catalytic activity following thermal treatment in H2 affected the hydrogenation activity and with Au/Pd intermixing the activity shifted to higher Pd concentration. Comparison of the TOF (1/s) and selectivity values allowed us to conclude that the homogenized particle with 68–80 at% Pd shows better hydrogenation activity and selectivity than the thin Pd shell (15–30 at% Pd) on the Au core.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Au/Pd core/shell; Pd shell; TEM; HRTEM characterization; Pd–Au/SiO2 catalyst; Acetylene hydrogenation
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Preparation of Pdshell–Aucore/SiO2 catalyst and catalytic activity for acetylene hydrogenation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 350, Issue 2, 30 November 2008, Pages 157–163
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