Daim ntawv thov thiab synthesis ntawm ZSM-5 molecular sieve

I. Kev Taw Qhia

ZSM-5 molecular sieve yog ib yam ntawm cov khoom siv microporous nrog cov qauv tshwj xeeb, uas tau siv dav hauv ntau lub teb vim nws cov khoom zoo adsorption, stability thiab catalytic. Nyob rau hauv daim ntawv no, daim ntawv thov thiab synthesis ntawm ZSM-5 molecular sieve yuav qhia kom meej.

Qhov thib ob, daim ntawv thov ntawm ZSM-5 molecular sieve

1. Catalyst: Vim lub siab acidity thiab tshwj xeeb pore qauv ntawm ZSM-5 molecular sieve, nws tau dhau los ua ib qho zoo heev catalyst rau ntau yam tshuaj, xws li isomerization, alkylation, lub cev qhuav dej, thiab lwm yam.
2. Adsorbent: ZSM-5 molecular sieve muaj qhov loj pore ntim thiab zoo adsorption kev ua tau zoo, thiab yog dav siv nyob rau hauv gas sib cais, kua sib cais thiab catalyst carrier thiab lwm yam teb.
3. Catalyst cab kuj: tuaj yeem siv los ua catalyst carrier los txhim kho cov haujlwm thiab kev ruaj ntseg ntawm cov catalyst.

Synthesis ntawm ZSM-5 molecular sieve

Lub synthesis ntawm ZSM-5 molecular sieve feem ntau yog siv cov qauv qauv, uas tswj cov txheej txheem synthesis los ntawm kev tswj kub, siab, raw khoom piv thiab lwm yam kev mob. Ntawm lawv, feem ntau siv raw cov ntaub ntawv yog sodium silicate thiab sodium aluminate.

1. Kev tswj ntawm silica-aluminium piv: silica-aluminium piv yog ib qho tseem ceeb ntawm ZSM-5 molecular sieve, uas tuaj yeem tswj tau los ntawm kev kho qhov piv ntawm sodium silicate thiab sodium aluminate. Qhov siab dua qhov piv ntawm silicon rau txhuas, qhov ntau inclined lub molecular sieve tsim yog silicon, thiab vice versa.
2. Synthesis kub thiab siab: synthesis kub thiab siab kuj tseem ceeb yam cuam tshuam rau kev tsim ntawm ZSM-5 molecular sieve. Feem ntau, qhov kub thiab txias ntau dua yog qhov tsim nyog rau kev tsim ZSM-5 molecular sieves.
3. Lub sij hawm crystallization thiab crystallization kub: lub sij hawm crystallization thiab crystallization kub yog qhov tseem ceeb cuam tshuam rau cov qauv ntawm ZSM-5 molecular sieve. Tus nqi tsim thiab purity ntawm ZSM-5 molecular sieve tau txhim kho los ntawm kev nce qhov kub ntawm crystallization ntawm lub sij hawm tsim nyog crystallization.
4. Synthetic auxiliaries: Qee zaum txhawm rau kho tus nqi pH lossis txhawb cov txheej txheem crystallization, nws yog ib qho tsim nyog yuav tsum tau ntxiv qee cov khoom siv hluavtaws, xws li NaOH, NH4OH, thiab lwm yam.

Iv. Xaus

Raws li ib qho tseem ceeb microporous khoom, ZSM-5 molecular sieve muaj ib tug dav daim ntawv thov kev cia siab. Nws yog ib qho tseem ceeb kom nkag siab txog cov txheej txheem synthesis rau nws daim ntawv thov dav. Los ntawm kev tswj cov txheej txheem synthesis, cov qauv pore, acidity thiab catalytic zog ntawm ZSM-5 molecular sieve tuaj yeem tswj tau zoo, uas muab ntau txoj hauv kev rau nws daim ntawv thov hauv ntau yam.