Impembelelo yeSi-Al ratio kwi-ZSM molecular sieve

I-Si / Al ratio (i-Si / Al ratio) yipropati ebalulekileyo ye-ZSM ye-molecular sieve, ebonisa umxholo ohambelanayo we-Si no-Al kwi-molecular sieve. Lo mlinganiselo unempembelelo ebalulekileyo kumsebenzi kunye nokukhetha kwe-ZSM ye-molecular sieve.
Okokuqala, umlinganiselo we-Si / Al unokuchaphazela i-acidity ye-ZSM ye-molecular sieves. Ngokubanzi, umlinganiselo we-Si-Al uphezulu, i-acidity yomelele ye-molecular sieve. Oku kungenxa yokuba i-aluminiyam inokubonelela ngeziko elongezelelweyo le-acidic kwi-sieve ye-molecular, ngelixa i-silicon ikakhulu imisela isakhiwo kunye nokuma kwe-molecular sieve.
Ngoko ke, i-acidity kunye nomsebenzi we-catalytic we-molecular sieve inokulawulwa ngokulungelelanisa umlinganiselo we-Si-Al. Okwesibini, umlinganiselo we-Si / Al unokuchaphazela ukuzinza kunye nokumelana nobushushu be-ZSM ye-molecular sieve.
Izisefu zemolekyuli ezidityaniswe kumlinganiselo we-Si/Al ophezulu zihlala zinozinzo olungcono lwe-thermal kunye ne-hydrothermal.
Oku kungenxa yokuba i-silicon kwi-sieve ye-molecular inokubonelela ngozinzo olongezelelweyo, ukuchasana neempendulo ezifana ne-pyrolysis kunye ne-acid hydrolysis. Ukongeza, umlinganiselo we-Si / Al unokuchaphazela ubungakanani bepore kunye nokumila kweesefu ze-molecular ZSM.
Ngokubanzi, umlinganiselo we-Si-Al uphezulu, umncinci ubungakanani bepore ye-molecular sieve, kwaye imilo isondele kwisangqa. Oku kungenxa yokuba i-aluminium inokubonelela ngeengongoma ezongezelelweyo zokuxhamla kwi-molecular sieve, okwenza i-crystal structure ibe yinkimbinkimbi. Isishwankathelo, umphumo we-Si-Al ratio kwi-ZSM ye-molecular sieve i-multifaceted.
Ngokulungelelanisa umlinganiselo we-Si-Al, iisefu zemolekyuli ezinobungakanani obuthile bepore kunye nokumila, i-asidi elungileyo kunye nokuzinza kunokwakheka, ukuze kuhlangatyezwane kakuhle neemfuno zeendlela ezahlukeneyo zokuphendula.