fulltext.study @t Gmail

Coprecipitation versus chemical vapour deposition to prepare Rh/Ni bimetallic catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
45444 46412 2015 10 PDF Available
Title
Coprecipitation versus chemical vapour deposition to prepare Rh/Ni bimetallic catalysts
Abstract

•Rh/Ni catalysts were prepared by coprecipitation and chemical vapour deposition.•The Rh/Ni ratio determined the formation and growth of particles.•A strong Rh/Ni interaction in coprecipitated catalysts yielded better performances.

The Rh/Ni interaction in bimetallic Rh/Ni/Mg/Al hydrotalcite-type (HT) derived catalysts for the catalytic partial oxidation (CPO) of CH4 was studied modifying the preparation method. The conventional incorporation of both Rh and Ni by coprecipitation (CP) of HT precursors was compared with the addition of Rh by chemical vapour deposition (CVD) to reduced Ni/Mg/Al HT-derived catalysts. Two Ni loadings were selected (about 8 and 2 wt.%), whereas the Rh content was kept constant (0.18 wt.%). Ni- and Rh-monometallic catalysts were prepared as reference materials.The addition of Rh resulted in an increase in Ni reducibility and dispersion for both CP and CVD catalysts. The Rh/Ni interaction was stronger in CP catalysts, while in CVD ones Rh overspread either on the support or Ni particles, with a preferential deposition on the latter. The Ni loading, regardless of the Rh incorporation method, was the main factor to determine the formation and growth of metallic particles. CO-DRIFTS spectra revealed that the dispersing and reducibility effect of Rh was more evident in the samples with a lower Ni-loading.The small amount of Rh in the catalysts yielded to higher CH4 conversions, especially in low Ni-containing catalysts wherein the Ni0 oxidation was avoided. All the catalysts were activated during catalytic tests at high temperature by reduction of hardly reducible species. The strongest Rh/Ni interaction in CP catalysts yielded to better performances with a lower carbon formation and high resistance towards metallic particle sintering.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrotalcite-type; Ni/Rh; Coprecipitation; Chemical vapour deposition; Catalytic partial oxidation of methane
First Page Preview
Coprecipitation versus chemical vapour deposition to prepare Rh/Ni bimetallic catalysts
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 B: Environmental - Volume 179, December 2015, Pages 150–159
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