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Low temperature dry reforming of methane over Pt–Ni–Mg/ceria–zirconia catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
45451 46412 2015 7 PDF Available
Title
Low temperature dry reforming of methane over Pt–Ni–Mg/ceria–zirconia catalysts
Abstract

•Pt (0–2%)–8% Ni–8% Mg on Ce/Zr support synthesized and characterized.•Dry reforming activity linked to reduction temperature and amount of basic sites.•0.5% Pt catalyst maximized conversion and was stable over 100 h.•0.5% Pt catalyst had high TOF (3.50 s−1 at 450 °C) compared to literature.

Low temperature dry reforming of methane was studied over platinum (0.2–2 wt.%) and/or nickel (8 wt.%) and magnesium (8 wt.%) immobilized onto a ceria–zirconia support. Ceria–zirconia (0.6:0.4) solid solutions were synthesized by precipitation and the metals were loaded by the incipient wetness method. XRD patterns demonstrated that the support was a cubic fluorite structure and Ni and Mg were deposited onto it. Temperature-programmed reduction showed that Pt addition substantially decreased the reduction temperature and the impact became less prominent with increasing Pt loading. The Ni–Mg/(Ce0.6Zr0.4)O2 had the highest number of basic sites and the amounts decreased with the addition of platinum. The lowest CH4 and CO2 conversion (X10) temperatures were achieved at 454 °C and 437 °C, respectively, using a 0.5% Pt–Ni–Mg/(Ce0.6Zr0.4)O2 catalyst. This catalyst was optimum because it balanced between the enhanced reducibility and decreasing number of basic sites, which both occurred with increasing Pt loading. Dry reforming experiments also indicated that Pt decreased the reaction onset temperature for methane and CO2 and correlated to a slight decrease in the H2:CO ratio (though still higher than for the 0.5% Pt–Ce0.6Zr0.4O2 control catalyst). Steady-state reaction experiments were conducted between 430 and 470 °C for the best catalyst and the results showed TOFs increasing from 2.69 to 4.74 s−1 with increasing temperature and minimal deactivation when left on stream for 100.5 h. A comparison to literature indicates that the Pt/Ni/Mg/Ce0.6Zr0.4O2 catalyst has among the highest activities, especially if Ir and Rh catalysts are not included.

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Keywords
Dry reforming; Low temperature; (CeZr)O2
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Low temperature dry reforming of methane over Pt–Ni–Mg/ceria–zirconia catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 179, December 2015, Pages 213–219
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