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Development of Ni-Pd bimetallic catalysts for the utilization of carbon dioxide and methane by dry reforming

Paper ID Volume ID Publish Year Pages File Format Full-Text
42672 45936 2009 9 PDF Available
Title
Development of Ni-Pd bimetallic catalysts for the utilization of carbon dioxide and methane by dry reforming
Abstract

The present research deals with catalyst development for the utilization of CO2 in dry reforming of methane with the aim of reaching highest yield of the main product synthesis gas (CO, H2) at lowest possible temperatures. Therefore, Ni-Pd bimetallic supported catalysts were prepared by simple impregnation method using various carriers. The catalytic performance of the catalysts was investigated at 500, 600 and 700 °C under atmospheric pressure and a CH4 to CO2 feed ratio of 1. Fresh, spent and regenerated catalysts were characterized by N2 adsorption for BET surface area determination, XRD, ICP, XPS and TEM. The catalytic activity of the studied Ni-Pd catalysts depends strongly on the support used and decreases in the following ranking: ZrO2-La2O3, La2O3 > ZrO2 > SiO2 > Al2O3 > TiO2. The bimetallic catalysts were more active than catalysts containing Ni or Pd alone. A Ni to Pd ratio = 4 at a metal loading of 7.5 wt% revealed the best results. Higher loading lead to increased formation of coke; partly in shape of carbon nanotubes (CNT) as identified by TEM. Furthermore, the effect of different calcination temperatures was studied; 600 °C was found to be most favorable. No effect on the catalytic activity was observed if a fresh catalyst was pre-reduced in H2 prior to use or spent samples were regenerated by air treatment. Ni and Pd metal species are the active components under reaction conditions. Best conversions of CO2 of 78% and CH4 of 73% were obtained using a 7.5 wt% NiPd (80:20) ZrO2-La2O3 supported catalyst at a reaction temperature of 700 °C. CO and H2 yields of 57% and 59%, respectively, were obtained.

Graphical abstractCO2 reforming of methane using Ni-Pd bimetallic catalysts was investigated. Best conversions of CO2 of 78% and CH4 of 73% were obtained using a 7.5 wt% NiPd (80:20) ZrO2-La2O3 supported catalyst at 700 °C. CO and H2 yields of 57% and 59%, resp, were obtained. The catalysts were characterized by XRD, ICP, XPS and TEM.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Dry reforming of methane; Syngas; Ni-Pd bimetallic supported catalyst; Carbon nanotubes; Coke formation; CO2 utilization
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Development of Ni-Pd bimetallic catalysts for the utilization of carbon dioxide and methane by dry reforming
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 366, Issue 2, 25 September 2009, Pages 333–341
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