Boehmite ka sɛgɛsɛgɛli kɛcogo ɲɛfɔlen

Boehmite, n’o ye aliminiyɔmu-minɛn nafama ye, o bɛ kɛ ka caya katalisita dɛmɛnanw na, litiyamu batiri danfaralanw datugulanw na, ani seramikiw la. Walasa a saniya, a kristalɛ jɔcogo, ani a farikolo cogoyaw bɛ bɛn izini sariyaw ma, sɛgɛsɛgɛli kɛcogo sigilen dɔ ka kan ka kɛ walasa ka jogoɲini kɛ. Ninnu ye fɛɛrɛ kunbabaw ni fɛɛrɛko yɔrɔw ye boehmite sɛgɛsɛgɛli la.

I. Sample Pretreatment (Farakɛcogo ɲɛfɛ).

Boehmite tacogo ka kan ka furakɛ ka kɔn sani u ka sɛgɛsɛgɛli kɛ walasa ka sɛgɛsɛgɛli jaabiw sɔrɔ minnu bɛ tiɲɛ. Fɔlɔ, aw bɛ fɛnɲɛnamafagalan kɛnɛ in mugumugu fo ka se 200 ma walima ka tɛmɛ o kan ni sɔgɔlan ye ka a ja foronto la degere 105 -110 la sanga 2 kɔnɔ walasa ka ji minɛlen bɔ. Ni sɛgɛsɛgɛli bɛ kɛ ni sanfɛla baarakɛjɛkuluw ye walima fɛnɲɛnamaw ka nɔgɔw ye, saniya wɛrɛ ka kan ka kɛ ni etanɔli jilama ye ani ka a ja ni fɛnɲɛnamafagalan ye walasa ka furaji tolenw bali ka sɛgɛsɛgɛli nataw bali.

II. Fɛnɲɛnɛmako sɛgɛsɛgɛli
1.Particle Size Distribution: Laser particle size analyseur (i n’a fɔ Malvern Mastersizer) bɛ kɛ ka boehmite particles particle size hakɛ suman. A ka c’a la, D50 (cɛmancɛ cɛmancɛ) bɛ kɔlɔsi 0,5 ni 5 μm cɛ walasa ka baarakɛcogo danfaralenw ka ɲininiw dafa.

2.Yɔrɔ kɛrɛnkɛrɛnnen : Yɔrɔ kɛrɛnkɛrɛnnen bɛ suman ni BET azote adsorption fɛɛrɛ ye (i n’a fɔ Micromeritics ASAP 2020). Boehmite saniyalenba-a ka c’a la, a yɔrɔ kɛrɛnkɛrɛnnen bɛ se m2/g 5 fo 20 ma, o bɛ nɔ bila katalizi baara la ani a dacogo kelen na.

3.Kristali cogoya: Scanning electron microscopy (SEM) bɛ kɛ ka fɛnɲɛnamafagalanw cogoya kɔlɔsi. A ka c’a la, Boehmite bɛ a jira ko a bɛ i n’a fɔ flakɛ- walima a bɛ kɛ ni fiɲɛ ye. Morifolozi bɛnkan ye taamasiyɛn jɔnjɔn ye baarakɛcogo kɔrɔlenw-ban.

III. Kemikisɛw ka danfara ni u saniyacogo sɛgɛsɛgɛli
1.Kimikɛcogo : Al2O3 kɔnɔfɛnw sɛgɛsɛgɛli hakɛlama bɛ kɛ ni X-ray fluorescence spectroscopy (XRF) walima inductively coupled plasma optical emission spectroscopy (ICP-OES) ye. Industrial-grade boehmite bɛ Al2O3 saniya de wajibiya min ka bon ni 95% ye walima min bɛ bɛn 95% ma, k’a sɔrɔ boehmite saniyalenba-saniyalen bɛ saniya de wajibiya min ka bon ni 99% ye walima min bɛ bɛn 99% ma.

2.Nɔgɔ sɔrɔli : ICP-MS walima atomique absorption spectroscopie (AAS) bɛ kɛ ka nɔgɔ taamasiɲɛw dɔn i n’a fɔ SiO2, Fe2O3, ani Na2O. U kɔnɔkow ka kan ka dantigɛ kosɛbɛ walasa u kana nɔ bila fɛnw na.

IV. Kristali jɔcogo cogoya jirali
1.X-ray Diffraction (XRD): Bragg diffraction peaks bɛ kɛ ka boehmite ka -AlOOH kristalɛ cogoya dafa ani ka kristalin hakɛ jateminɛ. boehmite standard bɛ difraction peaks taamasiɲɛw jira 2θ hakɛ la min bɛ se degere 14 ma ka se degere 35 ma . Nɔgɔw sɔrɔli (i n’a fɔ -Al2O3) bɛ se ka kɛ sababu ye ka -jeli kɛ ka tɛmɛ.

2.Thermogravimetric Analysis (TGA): Ka sumaya fo ka se degere 1000 ma fiɲɛbɔyɔrɔ la ani ka girinya dɔgɔyali kuru kɔlɔsi. Boehmite bɛ tiɲɛ cogoya la ka kɛ -Al2O3 ye degere 300 ni degere 500 cɛ . Kisɛya hakɛ bɛ se ka kɛ ka hidroksili hakɛ sɛgɛsɛgɛ.

V. Baarakɛcogo sɛgɛsɛgɛli (A bɛ se ka kɛ) .

Ni aw bɛ baara kɛrɛnkɛrɛnnenw kɛ, pH sumani (a ka c’a la 7-9), tulu tali sɛgɛsɛgɛli (walasa ka a jɛnsɛnni jateminɛ), walima poroziti sɛgɛsɛgɛli (i n’a fɔ mɛkisikalan doncogo porosimɛtiri) fana bɛ se ka kɛ walasa ka katalisita dɛmɛnanw walima batiriw ka ɲinini kɛrɛnkɛrɛnnenw dafa.

Kuma surun na, boehmite sɛgɛsɛgɛli taabolo bɛ fɛn caman-sɛgɛsɛgɛli de wajibiya min bɛ farikolo, kemikaliya ani kristalɛ sɛgɛsɛgɛli fara ɲɔgɔn kan walasa ka baarakɛcogo sabatilen ni dannayalen sabati ani ka jogoɲumanya sabatili di duguma baarakɛcogo la.