fulltext.study @t Gmail

Sol-derived AuNi/MgAl2O4 catalysts: Formation, structure and activity in dry reforming of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
40256 45848 2013 10 PDF Available
Title
Sol-derived AuNi/MgAl2O4 catalysts: Formation, structure and activity in dry reforming of methane
Abstract

•Metal sol synthesis produces dispersed Ni–Au particles.•Au enriched and Ni enriched alloyed particles are formed over MgAl2O4 after reduction.•Au influences the dry reforming activity of the Ni catalyst and promotes the RWGS reaction.•Less but more interacting carbon is formed during the reaction over the Au doped Ni catalysts.

Ni nanoparticles doped with different amount of gold were supported on MgAl2O4 by deposition from aqueous metal sol producing a series of catalysts with different Au content. The sol procedure was allowed to obtain dispersed metal particles with different composition. The particle size and the particle composition of the sol were maintained even after being deposited on the support. The catalysts, characterized by several techniques such as TPR, XPS, XRD, TEM, HRTEM and EELS at the different stages of their life exhibited significant structural modification. In particular, thermal treatments in reducing and oxidizing environment produced NiAu alloy phases and NiO surface segregation, respectively. When testing for methane dry reforming with CO2 in temperature ramped reaction, the monometallic nickel catalyst was more active at lower temperature whereas the bimetallic catalysts were more active at higher temperature. The presence of gold slightly affected the CO/H2 ratio due to the occurrence of parallel reactions such as the reverse water gas shift reaction (RWGS). Both types of catalysts, monometallic and bimetallic ones, deactivated a little with time but the degree of activity loss was not in straightforward relation with Au content due to the different effect of gold on the stability and on the amount of carbon formation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (107 K)Download as PowerPoint slide

Keywords
Dry reforming; Methane; Nickel catalysts; MgAl2O4 support; Gold effect
First Page Preview
Sol-derived AuNi/MgAl2O4 catalysts: Formation, structure and activity in dry reforming of methane
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 468, 5 November 2013, Pages 250–259
Authors
, , , , , , , ,
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