I-Si/Al ratio (i-Si/Al ratio) iyimpahla ebalulekile ye-ZSM molecular sieve, ebonisa okuqukethwe okuhlobene kuka-Si no-Al esisefweni samangqamuzana. Lesi silinganiso sinomthelela obalulekile emsebenzini nasekukhetheni kwe-ZSM ye-molecular sieve.
Okokuqala, isilinganiso se-Si/Al singathinta i-acidity ye-ZSM ye-molecular sieves. Ngokuvamile, ukuphakama kwesilinganiso se-Si-Al, kuqina i-acidity yesisefo samangqamuzana. Lokhu kungenxa yokuthi i-aluminium inganikeza isikhungo esine-asidi eyengeziwe kusihlungi samangqamuzana, kuyilapho i-silicon inquma ngokuyinhloko ukwakheka nokuma kwesisefo samangqamuzana.
Ngakho-ke, i-acidity kanye nomsebenzi we-catalytic we-sieve ye-molecular ingalawulwa ngokulungisa isilinganiso se-Si-Al. Okwesibili, isilinganiso se-Si/Al singaphinda sithinte ukuzinza nokumelana nokushisa kwe-ZSM ye-molecular sieve.
Izisefo zamangqamuzana ezihlanganiswe ngezilinganiso eziphakeme ze-Si/Al ngokuvamile ziba nokuzinza okungcono kwe-thermal kanye ne-hydrothermal.
Lokhu kungenxa yokuthi i-silicon ku-sieve yamangqamuzana inganikeza ukuzinza okwengeziwe, ukumelana nokusabela okufana ne-pyrolysis ne-acid hydrolysis. Ngaphezu kwalokho, isilinganiso se-Si/Al singaphinda sithinte usayizi wembotshana kanye nokuma kwezisefo ze-molecular ZSM.
Ngokuvamile, ukuphakama kwe-Si-Al ratio, kuncane usayizi we-pore we-molecular sieve, futhi umumo useduze nombuthano. Lokhu kungenxa yokuthi i-aluminium inganikeza amaphuzu engeziwe okuxhumanisa kusihlungi samangqamuzana, okwenza ukwakheka kwekristalu kuhlangane kakhudlwana. Kafushane, umphumela wesilinganiso se-Si-Al kusihlungi se-molecular ye-ZSM sinezici eziningi.
Ngokulungisa isilinganiso se-Si-Al, izisefo zamangqamuzana ezinosayizi nokuma kwembotshana ethile, i-asidi enhle nokuzinza kungahlanganiswa, ukuze kuhlangatshezwane kangcono nezidingo zokusabela okuhlukahlukene kwe-catalytic.
Isikhathi sokuthumela: Dec-11-2023
