Nano platinum (Pt) rau peb-txoj kev catalyst hauv kev kho tsheb tsheb

Peb-txoj kev catalyst yog ib qho catalyst siv nyob rau hauv peb-txoj kev catalytic converter ntawm tsheb tso pa tawm. Nws yog siv los catalytically hloov tsheb tso pa tawm ua ntej nws tawm mus, thiab oxidize CO, HC, thiab NOx feem, txo cov pa phem rau carbon dioxide (CO2), nitrogen (N2), thiab dej vapor (H2O) uas tsis muaj teeb meem rau tib neeg. noj qab haus huv.
Pt yog qhov ntxov tshaj plaws catalytic active tivthaiv siv nyob rau hauv tsheb purification tsheb. Nws lub luag haujlwm tseem ceeb yog kev hloov pauv ntawm carbon monoxide thiab hydrocarbons. Pt muaj peev xwm txo qis rau nitrogen monoxide, tab sis thaum NO concentration siab lossis SO2 tam sim no, nws tsis zoo li Rh, thiab platinum nanoparticles (NPs) yuav sinter dhau sijhawm. Txij li thaum platinum yuav agglomerate los yog txawm sublimate ntawm qhov kub thiab txias, nws yuav nyob rau hauv lem txo tag nrho cov catalytic kev ua si. Cov kev tshawb fawb tau lees paub tias platinum pawg hlau atoms tuaj yeem hloov pauv ntawm cov hlau nanoparticles thiab cov perovskite matrix ntau, yog li rov ua haujlwm catalytic.
Cov hlau zoo nkauj muaj qhov zoo tshaj plaws catalytic selectivity. Muaj cov teebmeem kev sib raug zoo lossis kev sib koom ua ke ntawm cov hlau muaj txiaj ntsig thiab ntawm cov hlau muaj txiaj ntsig thiab cov neeg txhawb nqa. Qhov sib txawv ntawm cov hlau muaj txiaj ntsig sib xyaw ua ke, qhov sib piv thiab cov thev naus laus zis thauj khoom muaj kev cuam tshuam zoo rau ntawm qhov chaw muaj pes tsawg leeg, cov qauv saum npoo, kev ua haujlwm catalytic thiab kub-kub sintering tsis kam ntawm cov catalyst. Tsis tas li ntawd, ntau txoj hauv kev ntxiv cov neeg txhawb nqa kuj yuav muaj qee yam cuam tshuam rau cov catalyst. Ib tiam tshiab ntawm Pt-Rh-Pd ternary catalysts tau tsim los ntawm kev siv kev sib koom tes ntawm Pt, Rh thiab Pd, uas tau txhim kho cov catalyst kev ua tau zoo.