کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6465578 | 1422952 | 2017 | 11 صفحه PDF | دانلود رایگان |
- Al2O3 monolith 100Â cpsi and Al2O3 open cell foams 30/45Â ppi coated with 3% Pd/Co3O4.
- Pressure drop and volumetric heat transfer coefficients determined.
- At low WHSV the 30 ppi foam reaches full methane conversion below 400 °C.
- Good performance associated with higher Nusselt and hv of the coated foams.
The reactivity of a catalytic layer consisting of 3Â wt.% of Pd/Co3O4 over an alumina monolith (100Â cpsi, diameter 0.9Â cm, length 3Â cm) and two alumina open cell foams (30 and 45Â ppi, diameter 0.9Â cm, length 3Â cm) was investigated in the oxidation of residual methane in lean conditions. The ceramic structures were coated via solution combustion synthesis (Co3O4) and wetness impregnation (Pd). The catalytic reactivity of the catalysts coated on the structured supports was assessed in a gas mixture containing 0.5 or 1Â vol.% of methane at different weight hourly space velocities (WHSV, 30 and 60Â NLÂ hâ1 gcatâ1). Moreover, the prepared structured catalysts were characterized by measuring the pressure drop and determining the volumetric heat transfer coefficients. Both the WHSV and the characteristics of the support influenced the catalytic activity. In general, open cell foams coated with Pd/Co3O4 show superior catalytic activity than the coated monolith.
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Journal: Chemical Engineering Journal - Volume 326, 15 October 2017, Pages 339-349