| Authors | زهره فتاح ,مهران رضائی,ابوالفضل بیابانی,عبداله ایران خواه |
|---|
| Journal | PROCESS SAF ENVIRON |
|---|
| Page number | 948 |
|---|
| Volume number | 9 |
|---|
| IF | 6.158 |
|---|
| Paper Type | Full Paper |
|---|
| Published At | 2635-05-11 |
|---|
| Journal Grade | Scientific - research |
|---|
| Journal Type | Electronic |
|---|
| Journal Country | Iran, Islamic Republic Of |
|---|
| Journal Index | ISI ,SCOPUS |
|---|
| Keywords | Magnesium; Cobalt; Nano particles;Experimental design; CO oxidation |
|---|
Abstract
In thisstudy,aseriesofCo–MgOmixedoxides(30wt.%Co)werepreparedbyco-precipitationmethodandemployed
as catalystinlowtemperatureCOoxidationreaction.ThepreparationconditionswereoptimizedbytheTaguchi
method ofexperimentaldesigntosynthesizeasamplewithhighcatalyticperformancetowardCOoxidationreac-
tion. Theeffectsoffourvariables,pHofsolution,agingtemperature,agingtimeandmolarityofprecursorsolution
at threelevelswereinvestigated.TheoptimizedsamplewascharacterizedbyX-raydiffraction(XRD),temperature
programmedreduction(TPR),temperatureprogrammeddesorptionofoxygen(O2-TPD), N2 adsorption/desorption,
thermal gravimetricanddifferentialthermalanalysis(TGA/DTA),andtransmissionelectronmicroscopy(TEM)tech-
niques. Theresultsrevealedthattheoptimizedsampleshowedamesoporousstructurewithanarrowporesize
distribution centeredintherangeof7–17nmandparticlesizeabout5.5nm.Itwasfoundthatthemolarityofsolu-
tion andagingtimehadthemostinfluenceontheCOconversion,respectively.Thecatalyticresultsshowedthat
the highestCOconversionobtainedfromsamplessynthesizedbyTaguchiorthogonalarraywasabout90%at200 ◦C,
while theCOconversionforoptimizedsamplewas95%.Inaddition,theeffectofoperationalconditionswasstudied
overoptimizedsample.
