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Combustion of methane over a Pd-Al2O3/SiO2 catalyst, catalyst activity and stability

Ahlstrom Silversand, AF and Odenbrand, Ingemar LU (1997) In Applied Catalysis A: General 153(1-2). p.157-175
Abstract
Palladium supported on Si-stabilised alumina has been demonstrated to be an active and durable catalyst for the combustion of methane. Si is more effective in stabilising alumina than La or Ba when the elements are added through an impregnation technique. Multiple stabilisation with combinations of La, Ba and Si does not increase further the stability against sintering. The stability increases logarithmically with the amount of Si added (0.5-8 atomic%). The rate of sintering is not affected by an increase of the water vapour content of the atmosphere from 1 to 20 vol.%. Doping palladium with rhodium or platinum increases the activity of the catalyst for methane combustion. The high-temperature stability of pure Pd is however superior to... (More)
Palladium supported on Si-stabilised alumina has been demonstrated to be an active and durable catalyst for the combustion of methane. Si is more effective in stabilising alumina than La or Ba when the elements are added through an impregnation technique. Multiple stabilisation with combinations of La, Ba and Si does not increase further the stability against sintering. The stability increases logarithmically with the amount of Si added (0.5-8 atomic%). The rate of sintering is not affected by an increase of the water vapour content of the atmosphere from 1 to 20 vol.%. Doping palladium with rhodium or platinum increases the activity of the catalyst for methane combustion. The high-temperature stability of pure Pd is however superior to the stabilities of the Rh- and Pt-doped catalysts. Addition of La or Ce to the Pd-catalyst increases its stability against thermal deactivation but leads to an overall decrease in activity. The activity of the as-prepared catalysts are affected by the Pd-content below a value corresponding to 5% of the monolayer capacity. Thermally deactivated catalysts show a stronger activity dependence of the Pd-content than as-prepared catalysts. The combustion reaction is first order with respect to methane and zero-order with respect to oxygen (>2 vol.% of oxygen). Carbon dioxide has no inhibitory effects on the combustion. The activity of the Pd-catalyst is decreased by a factor of 5 through deactivation at 1473 K for 768 h. The decrease in activity is linearly correlated to the decrease in specific surface area. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
catalytic combustion, methane, stabilised alumina, palladium
in
Applied Catalysis A: General
volume
153
issue
1-2
pages
157 - 175
publisher
Elsevier
external identifiers
  • wos:A1997XC80200012
  • scopus:0040250336
ISSN
0926-860X
DOI
10.1016/S0926-860X(96)00328-6
language
English
LU publication?
yes
id
2b10402f-1c14-43c5-ac19-e2209da9f6fa (old id 3916363)
date added to LUP
2013-07-02 14:11:23
date last changed
2017-04-30 13:27:42
@article{2b10402f-1c14-43c5-ac19-e2209da9f6fa,
  abstract     = {Palladium supported on Si-stabilised alumina has been demonstrated to be an active and durable catalyst for the combustion of methane. Si is more effective in stabilising alumina than La or Ba when the elements are added through an impregnation technique. Multiple stabilisation with combinations of La, Ba and Si does not increase further the stability against sintering. The stability increases logarithmically with the amount of Si added (0.5-8 atomic%). The rate of sintering is not affected by an increase of the water vapour content of the atmosphere from 1 to 20 vol.%. Doping palladium with rhodium or platinum increases the activity of the catalyst for methane combustion. The high-temperature stability of pure Pd is however superior to the stabilities of the Rh- and Pt-doped catalysts. Addition of La or Ce to the Pd-catalyst increases its stability against thermal deactivation but leads to an overall decrease in activity. The activity of the as-prepared catalysts are affected by the Pd-content below a value corresponding to 5% of the monolayer capacity. Thermally deactivated catalysts show a stronger activity dependence of the Pd-content than as-prepared catalysts. The combustion reaction is first order with respect to methane and zero-order with respect to oxygen (>2 vol.% of oxygen). Carbon dioxide has no inhibitory effects on the combustion. The activity of the Pd-catalyst is decreased by a factor of 5 through deactivation at 1473 K for 768 h. The decrease in activity is linearly correlated to the decrease in specific surface area.},
  author       = {Ahlstrom Silversand, AF and Odenbrand, Ingemar},
  issn         = {0926-860X},
  keyword      = {catalytic combustion,methane,stabilised alumina,palladium},
  language     = {eng},
  number       = {1-2},
  pages        = {157--175},
  publisher    = {Elsevier},
  series       = {Applied Catalysis A: General},
  title        = {Combustion of methane over a Pd-Al2O3/SiO2 catalyst, catalyst activity and stability},
  url          = {http://dx.doi.org/10.1016/S0926-860X(96)00328-6},
  volume       = {153},
  year         = {1997},
}