fulltext.study @t Gmail

The effect of V in La2Ni1−xVxO4+1.5x+δ on selective oxidative dehydrogenation of propane: Stabilization of lattice oxygen

Paper ID Volume ID Publish Year Pages File Format Full-Text
41963 45906 2010 8 PDF Available
Title
The effect of V in La2Ni1−xVxO4+1.5x+δ on selective oxidative dehydrogenation of propane: Stabilization of lattice oxygen
Abstract

In this study, the non-stoichiometric redox compounds La2NiO4+δ and La2Ni0.9V0.1O4.15+δ have been tested as an oxidant in selective oxidation of propane in pulse experiments at temperatures between 450 and 650 °C. The oxygen contents in the samples at different temperatures were calculated based on back-titration with O2 pulses as well as on TGA. In the case of La2Ni0.9V0.1O4.15+δ over-stoichiometric oxygen was the only active species, responsible for the formation of CO2, C3H6, C2H4 and CH4 while pulsing propane at all investigated temperatures. Contrary, the reactive species in La2NiO4+δ changed from over-stoichiometric oxygen only at 450 °C, to both over-stoichiometric and lattice oxygen at 550 °C, to lattice oxygen only at 650 °C. The activation of lattice oxygen and the consequent formation of Ni metal were detrimental for selectivity to propylene as formation of COx, CH4 and coke mainly occurred and no olefins were formed.

Graphical abstractThe non-stoichiometric redox compounds La2NiO4+δ and La2Ni0.9V0.1O4.15+δ have been tested as oxidants in selective oxidation of propane in pulse experiments at temperatures between 450 and 650 °C. The role of vanadium was crucial to stabilize both over-stoichiometric and lattice oxygen, diminishing the oxygen loss and delaying the consequent formation of Ni metal, detrimental for selectivity towards propylene.Figure optionsDownload full-size imageDownload high-quality image (74 K)Download as PowerPoint slideResearch highlights▶ Addition of V to La2NiO4 causes that over-stoichiometric oxygen-ions is the exclusive active species when pulsing and oxidizing propane. ▶ The rate of oxygen-ion removal, i.e. reduction of the oxide, is retarded and formation of Ni0 is prevented.

Keywords
Selective oxidative dehydrogenation; Propane; La2NiO4; Over-stoichiometric oxygen; Pulse test
First Page Preview
The effect of V in La2Ni1−xVxO4+1.5x+δ on selective oxidative dehydrogenation of propane: Stabilization of lattice oxygen
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 385, Issues 1–2, 15 September 2010, Pages 14–21
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