Abstract
This paper presents a study of the synthesis of AlPO4-5 and AlPO4-36 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 N2, Temperature Programmed Desorption with NH3, 31P 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.
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Abbreviations
- MTH:
-
Methanol to hydrocarbons
- MTA:
-
Methanol to aromatics
- MTO:
-
Methanol to olefins
- AlPO4-n:
-
Microporous crystalline aluminophosphate
- MeAPO:
-
Microporous crystalline aluminophosphate containing a transition metal ion
- MeAPSO:
-
Microporous crystalline aluminophosphate doubly substituted by two transition metal iones
- BTX:
-
Bencene, toluene and xilenes fraction
- AFI:
-
Aluminophosphate five structure
- TRI:
-
Tridymite structure
- ATS:
-
Aluminophosphate thirty-six structure
- MCHA:
-
N-Methyldicyclohexylamine
- TPA:
-
Tripropylamine
- WHSV:
-
Weight hourly space velocity
- SEM:
-
Scanning electron microscopy
- ICP-OES:
-
Inductively coupled plasma optical emission spectrometry
- NMR:
-
Nuclear magnetic resonance
- BET:
-
Brunauer–Emmett–Teller equation
- SM:
-
Substitution isomorphic
- XRD:
-
X-ray diffraction
- TPD:
-
Temperature programmed desorption
- TGA:
-
Thermogravimetric analyses
- DTG:
-
Derivate thermogravimetric
- SDA:
-
Structure-directing agent
- MR:
-
Member rings
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Acknowledgements
The authors thank the Spanish Research Agency -AEI- and the European Regional Development Fund -FEDER- for the financing of this work, through the Project MAT2016-77496-R (AEI / FEDER, EU). MGR thanks the Molecular Sieve Group of the Institute of Catalysis and Petrochemistry (CSIC) in Madrid and CONACyT for the support granted for the research stay in Spain. I thank Dr. Massiot for the ease of having the admfit program and doing the NMR deconvolution process to make the necessary calculations.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by DASC (supervision), JAP (writing—review and editing), CMÁ (methodology), ESA (supervision), DST (investigation), MS-S and MGC (methodology). The first draft of the manuscript was written by PhD student, MGR and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. We considerate the submitted is original and unique work and it has not been submitted to another journal simultaneity. The work is single study and it’s not up into several parts and results are presented clearly, honestly, and without, falsification or inappropriate the data manipulation, the study submitted is part of my doctoral thesis.
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García Ruiz, M., Solís Casados, D., Aguilar Pliego, J. et al. 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). Top Catal 63, 437–450 (2020). https://doi.org/10.1007/s11244-020-01266-3
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DOI: https://doi.org/10.1007/s11244-020-01266-3