Cov nyhuv ntawm Si-Al piv rau ZSM molecular sieve

Si / Al piv (Si / Al ratio) yog ib qho tseem ceeb ntawm ZSM molecular sieve, uas qhia txog cov ntsiab lus txheeb ze ntawm Si thiab Al nyob rau hauv molecular sieve. Qhov piv no muaj qhov cuam tshuam tseem ceeb ntawm kev ua haujlwm thiab kev xaiv ntawm ZSM molecular sieve.
Ua ntej, Si / Al piv tuaj yeem cuam tshuam cov acidity ntawm ZSM molecular sieves. Feem ntau, qhov siab dua Si-Al piv, qhov muaj zog acidity ntawm molecular sieve. Qhov no yog vim tias txhuas tuaj yeem muab qhov chaw ntxiv acidic nyob rau hauv molecular sieve, thaum silicon feem ntau txiav txim siab cov qauv thiab cov duab ntawm molecular sieve.
Yog li ntawd, cov acidity thiab catalytic kev ua si ntawm molecular sieve tuaj yeem tswj tau los ntawm kev kho cov Si-Al piv. Thib ob, Si / Al piv kuj tuaj yeem cuam tshuam qhov ruaj khov thiab kub tsis kam ntawm ZSM molecular sieve.
Molecular sieves synthesized ntawm siab dua Si / Al ratios feem ntau muaj zoo thermal thiab hydrothermal stability.
Qhov no yog vim hais tias silicon nyob rau hauv molecular sieve tuaj yeem muab kev ruaj ntseg ntxiv, tiv thaiv cov tshuaj tiv thaiv xws li pyrolysis thiab acid hydrolysis. Tsis tas li ntawd, Si / Al piv kuj tuaj yeem cuam tshuam qhov pore loj thiab cov duab ntawm ZSM molecular sieves.
Feem ntau, qhov siab dua Si-Al piv, qhov me dua qhov pore loj ntawm molecular sieve, thiab cov duab yog ze rau lub voj voog. Qhov no yog vim tias txhuas tuaj yeem muab cov ntsiab lus sib txuas ntxiv hauv molecular sieve, ua rau cov qauv siv lead ua ntau dua. Hauv cov ntsiab lus, cov nyhuv ntawm Si-Al piv ntawm ZSM molecular sieve yog multifaceted.
Los ntawm kev kho cov Si-Al piv, molecular sieves nrog cov pore loj thiab cov duab, zoo acidity thiab stability tuaj yeem ua ke, thiaj li ua kom tau raws li qhov xav tau ntawm ntau yam catalytic tshua.