Ka noi a me ka synthesis o ZSM-5 molecular sieve

I. Hoolauna

ʻO ZSM-5 molecular sieve he ʻano mea microporous me ka hoʻolālā kūʻokoʻa, i hoʻohana nui ʻia i nā kula he nui no kāna mau waiwai adsorption maikaʻi, kūpaʻa a me ka hana catalytic. Ma kēia pepa, e hoʻokomo ʻia ka noi a me ka synthesis o ZSM-5 molecular sieve.

ʻO ka lua, ka hoʻohana ʻana o ZSM-5 molecular sieve

1. Catalyst: Ma muli o ka acidity kiʻekiʻe a me ka hoʻolālā pore kū hoʻokahi o ZSM-5 molecular sieve, ua lilo ia i mea hoʻoikaika maikaʻi loa no ka nui o nā hopena kemika, e like me ka isomerization, alkylation, dehydration, etc.
2. Adsorbent: ZSM-5 molecular sieve he nui pore volume a me ka hana adsorption maikaʻi, a hoʻohana nui ʻia i ka hoʻokaʻawale kinoea, ka hoʻokaʻawale wai a me ka mea lawe catalyst a me nā māla ʻē aʻe.
3. Catalyst carrier: hiki ke hoʻohana 'ia ma ke ano he catalyst carrier e hoʻomaikaʻi i ka hana a me ka paʻa o ka catalyst.

Hoʻohui ʻia o ZSM-5 molecular sieve

Hoʻohana maʻamau ka synthesis o ZSM-5 molecular sieve i ke ʻano template, nāna e hoʻomalu i ke kaʻina hana synthesis ma ke kāohi ʻana i ka mahana, ke kaomi, ka lākiō waiwai a me nā kūlana ʻē aʻe. I waena o lākou, ʻo ka mea maʻamau i hoʻohana ʻia he sodium silicate a me ka sodium aluminate.

1. Ka mana o ka silica-aluminum ratio: silica-aluminum ratio kekahi o nā palena nui o ZSM-5 molecular sieve, hiki ke hoʻomaluʻia ma ka hoʻololiʻana i ka ratio o ka sodium silicate a me ka sodium aluminate. ʻOi aku ka kiʻekiʻe o ka lākiō o ke silikona i ka aluminika, ʻoi aku ka nui o ke ʻano o ke kānana molecular i hoʻokumu ʻia i ke silika, a ʻo ka hope.
2. ʻO ka mahana a me ke kaomi Synthesis: ʻO ka mahana synthesis a me ke kaomi kekahi mau mea nui e pili ana i ka hoʻokumu ʻana o ZSM-5 molecular sieve. Ma keʻano holoʻokoʻa, ʻoi aku ka maikaʻi o nā mahana kiʻekiʻe a me nā kaomi i ka hoʻokumu ʻana i nā kānana mole ZSM-5.
3. ʻO ka manawa crystallization a me ka mahana crystallization: ʻo ka manawa crystallization a me ka crystallization temperature nā mea nui e pili ana i ke ʻano o ZSM-5 molecular sieve. Ua hoʻomaikaʻi ʻia ka helu hoʻokumu a me ka maʻemaʻe o ZSM-5 molecular sieve ma o ka hoʻonui ʻana i ka mahana crystallization i ka manawa crystallization kūpono.
4. Nā mea kōkua Synthetic: I kekahi manawa no ka hoʻoponopono ʻana i ka waiwai pH a i ʻole ka hoʻoikaika ʻana i ke kaʻina hana crystallization, pono e hoʻohui i kekahi mau mea kōkua synthetic, e like me NaOH, NH4OH, etc.

Iv. Ka hopena

Ma ke ʻano he mea microporous koʻikoʻi, ʻo ZSM-5 molecular sieve ka manaʻo ākea ākea. He mea nui e hoʻomaopopo i ke ʻano synthesis no kona hoʻohana ākea. Ma ka hoʻomaluʻana i nā kūlana synthesis, hiki ke hoʻoponopono maikaʻiʻia ka hoʻolālā pore, acidity a me nā catalytic o ZSM-5 molecular sieve, e hāʻawi ana i nā mea e hiki ai ke hoʻohana i nāʻano likeʻole.