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Effect of silica/alumina ratio and structure-directing agent on the physical and chemical properties of SAPO-34 by William Lima dos Anjos; Sergio Andres Villalba Morales; Natália Maira Braga Oliveira; Gustavo Paim Valença is a Materials Science article available to read on EtoBox.
What is Effect of silica/alumina ratio and structure-directing agent on the physical and chemical properties of SAPO-34 about?
This work describes how the silica/alumina ratio (SAR) affects the framework, texture, chemical composition, and acidity of SAPO-34 molecular sieves synthesized via hydrothermal crystallization using morpholine (MOR) or triethylamine (TEA) as structure-directing agents (SDA's). The solids were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N 2 adsorption-desorption isotherms, thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), X-ray fluorescence spectrometry (XRF), silicon-29 MAS NMR spectroscopy ( 29 Si MAS NMR), aluminum-27 MAS NMR spectroscopy ( 27 Al MAS NMR), and temperature-programmed desorption of ammonia (NH 3 -TPD). The solids synthesized in this work had crystalline phases, vibrational modes, and morphology characteristics of silicoaluminophosphate (SAPO) materials. Pure SAPO-34 was obtained only with morpholine, while SAPO-18/34 was crystallized with TEA. The SAPO-34 synthesized with MOR had the higher relative crystallinity and incorporation of Si into the framework. The SAPO-18/34 prepared with TEA had the larger surface areas. The solids prepared with SAR 0.3 had only Si(4Al) coordination, independently of
Who reads Effect of silica/alumina ratio and structure-directing agent on the physical and chemical properties of SAPO-34?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- William Lima dos Anjos; Sergio Andres Villalba Morales; Natália Maira Braga Oliveira; Gustavo Paim Valença
- Publisher
- Springer Science and Business Media LLC
- Published
- 2021
- Language
- EN
- Field
- Materials Science (Physical Sciences)