Hydrothermal synthesis of cerium aluminophosphate

Araújo, Antônio S.; Diniz, Jaécio Carlos; Silva, Antonio Osimar S da; Melo, Rogério Alexandre Alves de

doi:10.1016/s0925-8388(96)02738-7

Cited by 20 publications

(2 citation statements)

References 10 publications

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“…Las mallas moleculares se sintetizaron mediante adaptación de procedimientos reportados (A. Souza de Araujo, et al,1997, X.-L. Wei et al, 2015 bajo métodos hidrotermales, utilizando reactores de acero inoxidable con recubrimiento interno de teflón sin agitación. Los geles se sometieron a 180°C y 6 horas (AlPO-5) y 200°C y 24 horas (SAPO-5) para su cristalización.…”

Section: Síntesisunclassified

Síntesis hidrotermal de AlPO-5 y SAPO-5 y su evaluación catalítica en la oligomerización de propileno

Llano

Manco

Echavarría

et al. 2020

reveia

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Los aluminofosfatos y silico-aluminofosfatos son familias de mallas moleculares que presentan sistemas de poros ordenados con disposición alternada de AlO4 y PO4. Estas pueden usarse en la reacción de oligomerización de propileno debido a sus propiedades para promover la obtención de hidrocarburos de cadenas más grandes como el Diesel. En el presente trabajo se sintetizó AlPO-5 y SAPO-5 y se evaluó su actividad catalítica en la oligomerización de propileno. Las mallas moleculares obtenidas se caracterizaron por difracción de rayos X (XRD), análisis termogravimétrico (TGA), espectroscopía de absorción atómica (AA), desorción de amoniaco a temperatura programada (NH3-TPD) y microscopía electrónica de barrido (SEM). Los productos de la reacción se analizaron mediante cromatografía de gases (GC). Se obtuvo un mayor rendimiento en la proporción de oligómeros pesados en la reacción luego de las impregnaciones de Cr y Ni al material AlPO-5, siendo el material Cr 3% AlPO-5 el de mayor rendimiento.

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Section: Síntesisunclassified

Síntesis hidrotermal de AlPO-5 y SAPO-5 y su evaluación catalítica en la oligomerización de propileno

Llano

Manco

Echavarría

et al. 2020

reveia

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“…Thus, the study of the crystallization parameters and their relation with the characteristics of the final materials is very important. Since the first synthesis of AlPO 4 -11, several works have been completed concerning this molecular sieve [9][10][11], however, little is known about its crystallization kinetics. Several studies have been reported on the mechanism of crystallization of molecular sieves using dry gel and solid transformation method [12,13], synthesis of nanocrystal [14], ionothermal procedure [15] and membranes with distinctive porosities [16].…”

Section: Introductionmentioning

confidence: 99%

Insight in the Crystallization Kinetics of AlPO4-11 Molecular Sieve Using Di-Isopropylamine as Template

et al. 2021

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The hydrothermal synthesis of aluminophosphate molecular sieve type AlPO4-11 was processed from chemicals containing psueudobohemite, 85% phosphoric acid, water, and di-isopropylamine as templating agent. The crystallization of the samples was studied by taking samples in times from 2 to 74 h. The obtained white powder products were characterized by X-ray diffraction patterns (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TG) and differential scanning calorimetry (DTG) data and pH measurement of the mother liquor. The pore volume, as determined from TG and DTG curves, was ca. 0.17 cm3g−1. The percent relative crystallinity was determined by XRD and FT-IR methods. The crystallization kinetics evidenced that the hydrothermal synthesis of AlPO4-11 exhibited in its initial phase a behavior of first order reaction with a specific velocity constant of ca. 0.25 h−1, as determined from XRD and FT-IR data. The results obtained by both X-ray diffraction and infrared spectroscopy are comparable, and FT-IR is found to be a rapid method for estimating crystallinity and structure of aluminophosphate.

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ChemInform Abstract: Hydrothermal Synthesis of Cerium Aluminophosphate.

et al. 1997

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Hydrothermal Synthesis of Cerium Aluminophosphate.-Molecular sieves CeAlPO-11 of composition Ce 0.04 Al 0.97 P 1.01 O 4.04 are prepared hydrothermally at 170 • C from Al(OH) 3 , H 3 PO 4 , and hydrated Ce 2 O 3 using (iPrO) 2 NH as organic template. The structure is similar to that of AlPO-11 zeolites. Incorporation of Ce 3+ into the aluminum phosphate matrix leads to an increase of the BET surface area from 104.8 m 2 /g for AlPO-11 to 188.4 m 2 /g. -(ARAUJO, A. S.; DINIZ, J. C.; SILVA, A. O. S.; MELO, R. A. A.; J. Alloys Compd. 250 (1997) 1-2, 532-535; Dep. Quim., Univ. Fed. Rio Grande do Norte, 59078 Natal, RN, Brazil; EN)

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Hydrothermal synthesis of cerium aluminophosphate

Cited by 20 publications

References 10 publications

Síntesis hidrotermal de AlPO-5 y SAPO-5 y su evaluación catalítica en la oligomerización de propileno

Síntesis hidrotermal de AlPO-5 y SAPO-5 y su evaluación catalítica en la oligomerización de propileno

Insight in the Crystallization Kinetics of AlPO4-11 Molecular Sieve Using Di-Isopropylamine as Template

ChemInform Abstract: Hydrothermal Synthesis of Cerium Aluminophosphate.

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