ISITSHAYINA

  • Isihluzo seemolekyuli

Isihluzo seemolekyuli

  • Inkcazo
  • Iimolekyuli zezinto ezahlukeneyo zihlukaniswa ngokubaluleka kunye nobukhulu be-adsorption, ngoko umfanekiso ubizwa ngokuba yi "molecular sieve".
  • I-molecular sieve (eyaziwa ngokuba yi-synthetic zeolite) yikristale ye-silicate microporous.Isiseko se-skeleton isakhiwo esakhiwe nge-silicon aluminate, kunye ne-cations zetsimbi (ezifana ne-Na +, K +, Ca2 +, njl.) ukulungelelanisa umrhumo ogqithisileyo ongalunganga kwikristale.Uhlobo lwe-molecular sieve luhlulwe kakhulu lube yi-A, uhlobo lwe-X kunye nohlobo lwe-Y ngokwesakhiwo sekristale.
 

Ifomula yekhemikhali yeeseli ze-zeolite

Mx/n [(AlO.2) x (SiO.2) y]WH.2O.

Mx/n.

I-Cation ion, ukugcina ikristale yombane ingathathi hlangothi

(AlO2) x (SiO2) y

I-skeleton yeekristale ze-zeolite, ezinemilo eyahlukeneyo yemingxuma kunye nemijelo

H2O

umphunga wamanzi adsorbed ngokwasemzimbeni

Iimbonakalo

I-adsorption eninzi kunye ne-desorption inokwenziwa

 

Uhlobo lwe-Amolecular sieve

 1

Inxalenye ephambili yohlobo lwe-A molecular sieve yi-silicon aluminate.Umngxuma oyintloko wekristale yisakhiwo se-octaring.I-aperture ye-crystal aperture enkulu yi-4Å(1Å=10-10m), eyaziwa ngokuba yi-type 4A (eyaziwa nangokuthi uhlobo A) i-molecular sieve;Tshintshela i-Ca2 + yeNa + kwi-4A ye-molecular sieve, yenza i-aperture ye-5A, eyile yodidi lwe-5A (aka calcium A) i-molecular sieve; i-K+ ye-4A ye-molecular sieve, eyenza i-aperture ye-3A, eyi-3A (aka potassium A) i-molecular sieve.

Uhlobo lwe-X ye-molecular sieve

2

Inxalenye ephambili ye-X ye-molecular sieve yi-silicon aluminate, i-crystal hole engundoqo yi-12 element element ring structure. ;Ca2 + yatshintshwa ngeNa + kwi-13X ye-molecular sieve, eyenza i-crystal sieve ye-molecular ene-aperture ye-8-9 A, ebizwa ngokuba yi-10X (eyaziwa ngokuba yi-calcium X) i-molecular sieve.

   
  • Isicelo
  • I-adsorption yezinto eziphathekayo ivela kwi-adsorption ebonakalayo (i-vander Waals Force), ene-polarity eyomeleleyo kunye namasimi e-Coulomb ngaphakathi komngxuma wayo wekristale, ebonisa amandla e-adsorption anamandla kwiimolekyuli ze-polar (ezifana namanzi) kunye neemolekyuli ezingaxutywanga.
  • Ukuhanjiswa kwe-aperture ye-sieve ye-molecular ifana kakhulu, kwaye kuphela izinto ezinobubanzi be-molecular encinci kunobubanzi bomngxuma onokungena kumngxuma wekristale ngaphakathi kwe-molecular sieve.

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