Incorporating Aluminum Into the Structure of SBA-15 by Adjusting the pH and Adding NaF

Incorporating Aluminum Into the Structure of SBA-15 by Adjusting the pH and Adding NaF

The Al incorporation on SBA-15 type material and the effects of pH adjusting and presence of NaF were studied. The direct synthesis method was performed for comparison. The following parameters were evaluated: the Si/Al ratio, pH increase, and amount of NaF added. These parameters have a great influ...

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Bibliographic Details
Published in:Materials research (São Carlos, São Paulo, Brazil) Vol. 22; no. 3; p. 1
Main Authors: Oliveira, Manuela Silva Martins de, Bieseki, Lindiane, Alencar, Ana Ellen Valentim de, Braga, Tiago Pinheiro, Pergher, Sibele Berenice Castellã
Format: Journal Article
Language:English
Published: Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 01-01-2019
ABM, ABC, ABPol
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects:
Al/SBA-15
Aluminum
Catalysis
Dehydration
direct synthesis
ENGINEERING, CHEMICAL
Ethanol
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
NMR
Nuclear magnetic resonance
Parameters
pH adjustment
Silicon
Synthesis
direct synthesis
Al/SBA-15
pH adjustment
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Summary:The Al incorporation on SBA-15 type material and the effects of pH adjusting and presence of NaF were studied. The direct synthesis method was performed for comparison. The following parameters were evaluated: the Si/Al ratio, pH increase, and amount of NaF added. These parameters have a great influence on the synthesis of the mesoporous Al/SBA-15 type, but the pH the most influential parameter for the incorporation of Al into the SBA-15 structure. The formation of the SBA-15 structure was observed through the direct synthesis method. However, aluminum is not present in the material. The increase in pH contributed to the formation of a disorganized material. By EDX, it was observed that synthesis with a Si/Al = 5 ratio and pH approximately 4 provides materials containing aluminum. When the amount of aluminum during the synthesis is lower, a pH of approximately 8 is required to incorporate aluminum into the final material. The Al-NMR analysis showed that it was possible to insert aluminum in the structure of SBA-15, but with the presence of aluminum hexa and pentacoordinated. In the catalytic test of the dehydration reaction of ethanol, the samples with higher aluminum contents showed better catalytic performance due to its higher acidity.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2018-0657