Synthesis and Characterization of Aluminophosphates Type-5 and 36 Doubly Modified with Si and Zn and Its Catalytic Application in the Reaction of Methanol to Hydrocarbons (MTH)

This paper presents a study of the synthesis of AlPO 4 -5 and AlPO 4 -36 materials doubly substituted by Si and Zn, as acid function and aromatizing function, respectively. The physicochemical properties of the zeotypes were studied by XRD, adsorption of N 2 , Temperature Programmed Desorption with...

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Bibliographic Details
Published in:Topics in catalysis 2020-08, Vol.63 (5-6), p.437-450
Main Authors: García Ruiz, Misael, Solís Casados, Dora A., Aguilar Pliego, Julia, Márquez Álvarez, Carlos, Sastre de Andrés, Enrique, Sanjurjo Tartalo, Diana, Sanchez-Sanchez, Manuel, Grande Casas, Marisol
Format: Article
Language:English
Subjects:
Aluminum phosphate
Ammonia
Catalysis
Catalytic activity
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Conversion
Deactivation
Hydrocarbons
Industrial Chemistry/Chemical Engineering
Methanol
NMR spectroscopy
Original Paper
Particle size
Pharmacy
Physical Chemistry
Selectivity
Synthesis
Zinc
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Summary:This paper presents a study of the synthesis of AlPO 4 -5 and AlPO 4 -36 materials doubly substituted by Si and Zn, as acid function and aromatizing function, respectively. The physicochemical properties of the zeotypes were studied by XRD, adsorption of N 2 , Temperature Programmed Desorption with NH 3 , 31 P MAS NMR and SEM. The incorporation of Zn and Si has shown an important effect on the acidic, textural and morphological properties of the samples. The particle size has a significant effect on the catalytic activity in the reaction of methanol to hydrocarbons in terms of methanol conversion and selectivity. It was observed that as the particle size decreases, the methanol conversion increases causing the catalyst to deactivate in a shorter time. The incorporation of Zn improved the selectivity to total aromatics by the aromatizing effect of Zn. The SAPO-5 (S5) material having a smaller particle size showed complete conversions of methanol. In contrast, the ZnAPO-5 (Z5) material showed low conversions but a high selectivity to total aromatics (41%). On the other hand, the material S36-2 presented a high selectivity to aromatics (58%) due to the high amount of Zn and Si. Both metals provided a certain acidic character to the materials.
ISSN:1022-5528
1572-9028
DOI:10.1007/s11244-020-01266-3