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Title of article :
Preparation of PtReAl2O3 catalysts by surface redox reactions II. Influence of the acid medium on Re deposition and PtRe interaction Original Research Article
Author/Authors :
C.L. Pieck، نويسنده , , P. Marecot، نويسنده , , Ann J. Barbier، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1996
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Abstract :
Bimetallic PtReAl2O3 catalysts are prepared under hydrogen atmosphere by a surface redox reaction between hydrogen adsorbed on a parent platinum/alumina catalyst and the perrhenate ion ReO4−. This reaction, called catalytic reduction, occurs only in an acidic medium, a maximum rhenium deposition appearing as a function of the concentration of the acid solution. The preparation of bimetallic PtReAl2O3 catalysts by catalytic reduction of the rhenium salt on a highly dispersed platinum catalyst leads to bimetallic particles after activation by direct reduction under hydrogen. The calcination at 450°C partially destroys the interaction between the two metals, the effect being more obvious on chloride containing samples. The activation procedure produces the reverse effect at high rhenium loading deposited on a parent catalyst of low dispersion.
Keywords :
Surface redox reactions , Rhenium , Platinum , View the MathML source
Journal title :
Applied Catalysis A:General
Serial Year :
Link To Document :