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Citrate or hydrotalcite?: As the precursor of Pt or Ru-doped Ni/Mg(Al)O catalyst for propane oxidative reforming

Paper ID Volume ID Publish Year Pages File Format Full-Text
42553 45930 2009 12 PDF Available
Title
Citrate or hydrotalcite?: As the precursor of Pt or Ru-doped Ni/Mg(Al)O catalyst for propane oxidative reforming
Abstract

Trace amounts of Pt- and Ru-doped Ni/Mg(Al)O catalysts were prepared by a citrate method and tested in the oxidative reforming of C3H8 under daily start-up and shut-down (DSS) operation. The activity and the sustainability of the catalysts were compared with those of the Pt- and Ru-doped Ni/Mg(Al)O catalysts derived from hydrotalcite (HT) precursor. The DSS operation of C3H8 reforming was carried out with O2 gas or O2/H2O mixed gas between 200 °C and 600 °C or 700 °C under air purging conditions. The catalysts underwent steaming treatment with H2/H2O mixed gas at 900 °C for 10 h. This allowed us to test the effect of Ni sintering on the catalyst deactivation. Coking was significantly suppressed on both HT- and citrate-derived Ni catalysts. Although both preparations produced highly dispersed Ni particles on the catalysts, the HT-derived catalysts exhibited more finely dispersed Ni particles, resulting in higher activity values than those of the citrate-derived catalysts. The regenerative activity due to redispersion of sintered Ni particles was enhanced over the HT-derived catalysts compared with the activity over citrate-derived catalysts. Although a clear redispersion of Ni particles was not observed in the oxidative reforming, i.e., in the absence of steam, the size decrease in Ni particles was more significant over the HT-derived catalysts than over the citrate-derived catalysts. The Mg(Al)O periclase structure derived from Mg-Al HT likely plays an important role in the regenerative activity of Pt- and Ru-Ni/Mg(Al)O catalysts. Pt-doping was more effective than Ru for the catalyst sustainability in the oxidative reforming of C3H8.

Graphical abstractTrace amounts of Pt-doped Ni/Mg(Al)O catalysts derived from hydrotaclite exhibited higher and more sustainable activity than those prepared by the citrate method. Mg(Al)O periclase that originated from Mg-Al HT played an important role in the regenerative activity of the catalysts via reversible reduction-oxidation between Ni0 and Ni2+ on/in Mg(Al)O assisted by hydrogen spillover from Pt.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
C3H8 reforming; H2 production; Pt or Ru-Ni/Mg(Al)O catalyst; Citrate; Hydrotalcite
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Citrate or hydrotalcite?: As the precursor of Pt or Ru-doped Ni/Mg(Al)O catalyst for propane oxidative reforming
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 356, Issue 2, 15 March 2009, Pages 231–242
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