Boron Incorporation by Hydrothermal Synthesis Into SAPO-5 and SAPO-11 Molecular Sieves

被引：0

作者：

Carvalho, Rosangela Pedrosa ^{[1
]}

Gouveia, Elisa Gabriela Costa ^{[1
]}

Solano, Julyane da Rocha Santos ^{[1
]}

de Carvalho, Luciene Santos ^{[2
]}

Alencar, Soraya Lira ^{[1
]}

Urbina, Maritza Montoya ^{[1
]}

da Silva, Antonio Osimar Sousa ^{[1
]}

机构：

[1] Univ Fed Alagoas, Dept Engn Quim, Lab Sintese Catalisadores, BR-57072900 Maceio, AL, Brazil

[2] Univ Fed Rio Grande do Norte, Lab Tecnol Energet, Inst Quim, BR-59072970 Natal, RN, Brazil

来源：

MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS | 2023年 / 26卷

关键词：

Boron; SAPO; AFI; AEL; METHANOL; CATALYSIS; ACIDITY; POROSITY; FRAMEWORK; ZEOLITES; LIFETIME;

D O I：

10.1590/1980-5373-MR-2022-0294

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Silicoaluminophosphates SAPO-5 and SAPO-11 were synthesized using the hydrothermal method, 170 oC with triethylamine and dipropylamine as the structure directing agents, respectively. This work aimed the incorporation of boron into the structures obtained by modifying the composition of the system, using as a reaction equation: Al2O3:P2O5:x SiO2: yB2O3:1,5TEA (or DPA):50H2O, with x, y=0-0.2. The phase was identified by XRD and characterized by FTIR, TGA/DTG, TPD-NH3 and nitrogen adsorption at -196 degrees C. The structure parameters confirmed the obtaining of pure structures, showing a slight contraction in the parameters of the unit cells, indicating the presence of boron in the crystal lattice. The Bronsted sites, were modified up to a maximum of boron (y = 0.1) and for higher content, the acidity was not significant. The modification of weak acidity related to the appearance of isolated BO3 groups, indicating that the silicon atoms were not sufficiently distributed for the formation of sites.

引用

页数：10

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