fulltext.study @t Gmail

Partial oxidation of propane to synthesis gas over noble metals-promoted Ni/Mg(Al)O catalysts—High activity of Ru–Ni/Mg(Al)O catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
44077 46002 2007 12 PDF Available
Title
Partial oxidation of propane to synthesis gas over noble metals-promoted Ni/Mg(Al)O catalysts—High activity of Ru–Ni/Mg(Al)O catalyst
Abstract

Effect of the addition of small amount of noble metal, i.e. Ru, Rh, Pd, Ir or Pt, in the Ni/Mg(Al)O catalyst on the catalytic activity for the partial oxidation of propane has been investigated. Mg2.5(Ni0.5)–Al hydrotalcite was prepared by co-precipitation and was calcined to form Mg2.5(Al,Ni0.5)O periclase. When the powders of the periclase were dipped in an aqueous solution of the nitrate of Ru(III), Rh(III), Pd(II), Ir(III) or Pt(II), a reconstitution of the hydrotaclite took place on the surface of Mg2.5(Al,Ni0.5)O particles due to a “memory effect”. The calcination followed by the reduction of the dipped samples produced highly dispersed noble metal-Ni supported catalysts. The loading of noble metal gave rise to a decrease in the reduction temperature of Ni2+ to Ni0 on Mg2.5(Al,Ni0.5)O periclase, an increase in the amount of H2 uptake on the Ni metal and moreover a decrease in the particle size of Ni metal formed on the noble metals-Ni/Mg2.5(Al)O catalyst. When the noble metals-Ni0.5/Mg2.5(Al)O catalysts were tested in the temperature-cycled operation of propane partial oxidation between 400 and 700 °C, the deactivation due to both Ni oxidation and coke formation on the catalyst was effectively suppressed by the loading of noble metals. The combination of Ru and Ni0.5/Mg2.5(Al)O was the most effective; the high sustainability against both Ni oxidation and coke formation was obtained only with 0.1 wt% of Ru loading. A dipping of 1.0 g of the powders of Ni0.5/Mg2.5(Al)O periclase in a 5 ml of Ru(III) nitrate-aqueous solution was enough to reconstitute the hydrotalcite on the surface of the powder particles, leading to the formation of the Ru–Ni bimetal loaded catalyst with the high activity as well as the high sustainability.

Graphical abstractRu–Ni0.5/Mg2.5(Al)O bimetallic catalysts prepared by adopting “memory effect” of hydrotalcite showed high and stable activity in the partial oxidation of propane to synthesis gas; the deactivation due to both Ni oxidation and coke formation on the catalyst was effectively suppressed by the loading of 0.1 wt%Ru. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Propane partial oxidation; H2 production; Ru–Ni/Mg(Al)O catalyst; Memory effect; Hydrotalcite
First Page Preview
Partial oxidation of propane to synthesis gas over noble metals-promoted Ni/Mg(Al)O catalysts—High activity of Ru–Ni/Mg(Al)O catalyst
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 318, 20 February 2007, Pages 143–154
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