Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
SAPO-11 Molecular Sieves Synthesized from Aluminum Isopropoxide and SiO2 with Various Dispersions
https://orcid.org/https://orcid.org/0000-0002-2210-9520
https://orcid.org/https://orcid.org/0000-0002-6601-390X
https://orcid.org/https://orcid.org/0000-0002-2230-772X
https://orcid.org/https://orcid.org/0000-0003-4256-4923
https://orcid.org/https://orcid.org/0000-0003-0745-5510
https://orcid.org/https://orcid.org/0000-0001-9297-4950
Various methods, such as XRF, XRD, SEM, N2 adsorption/desorption, NH3–TPD, and IR spectroscopy of adsorbed pyridine, were used to characterize SAPO-11 samples crystallized from Al-isopropoxide as an aluminum source and from SiO2 with various dispersions (4, 22, and 200 nm) as a silicon source. Decreasing the size of SiO2 particles was shown to enhance the total concentration of acid sites and to affect the morphology and increase the dispersion of the primary crystals. These SAPO-11 samples were then tested in the oligomerization of α-methylstyrene into its valuable dimers. The SAPO sample synthesized using a SiO2 sol with an average particle size of 4 nm exhibited a higher concentration of strong acid sites and higher accessibility of those sites than the other tested samples. These advantages allowed this SAPO sample to achieve the highest monomer conversion and the highest α-methylstyrene dimer selectivity.
SAPO-11 Molecular Sieves Synthesized from Aluminum Isopropoxide and SiO2 with Various Dispersions
https://orcid.org/https://orcid.org/0000-0002-2210-9520
https://orcid.org/https://orcid.org/0000-0002-6601-390X
https://orcid.org/https://orcid.org/0000-0002-2230-772X
https://orcid.org/https://orcid.org/0000-0003-4256-4923
https://orcid.org/https://orcid.org/0000-0003-0745-5510
https://orcid.org/https://orcid.org/0000-0001-9297-4950
Various methods, such as XRF, XRD, SEM, N2 adsorption/desorption, NH3–TPD, and IR spectroscopy of adsorbed pyridine, were used to characterize SAPO-11 samples crystallized from Al-isopropoxide as an aluminum source and from SiO2 with various dispersions (4, 22, and 200 nm) as a silicon source. Decreasing the size of SiO2 particles was shown to enhance the total concentration of acid sites and to affect the morphology and increase the dispersion of the primary crystals. These SAPO-11 samples were then tested in the oligomerization of α-methylstyrene into its valuable dimers. The SAPO sample synthesized using a SiO2 sol with an average particle size of 4 nm exhibited a higher concentration of strong acid sites and higher accessibility of those sites than the other tested samples. These advantages allowed this SAPO sample to achieve the highest monomer conversion and the highest α-methylstyrene dimer selectivity.
SAPO-11 Molecular Sieves Synthesized from Aluminum Isopropoxide and SiO2 with Various Dispersions
https://orcid.org/https://orcid.org/0000-0002-2210-9520
https://orcid.org/https://orcid.org/0000-0002-6601-390X
https://orcid.org/https://orcid.org/0000-0002-2230-772X
https://orcid.org/https://orcid.org/0000-0003-4256-4923
https://orcid.org/https://orcid.org/0000-0003-0745-5510
https://orcid.org/https://orcid.org/0000-0001-9297-4950
Various methods, such as XRF, XRD, SEM, N2 adsorption/desorption, NH3–TPD, and IR spectroscopy of adsorbed pyridine, were used to characterize SAPO-11 samples crystallized from Al-isopropoxide as an aluminum source and from SiO2 with various dispersions (4, 22, and 200 nm) as a silicon source. Decreasing the size of SiO2 particles was shown to enhance the total concentration of acid sites and to affect the morphology and increase the dispersion of the primary crystals. These SAPO-11 samples were then tested in the oligomerization of α-methylstyrene into its valuable dimers. The SAPO sample synthesized using a SiO2 sol with an average particle size of 4 nm exhibited a higher concentration of strong acid sites and higher accessibility of those sites than the other tested samples. These advantages allowed this SAPO sample to achieve the highest monomer conversion and the highest α-methylstyrene dimer selectivity.
SAPO-11 Molecular Sieves Synthesized from Aluminum Isopropoxide and SiO2 with Various Dispersions
Pet. Chem.
Agliullin, M. R. (Autor:in) / Serebrennikov, D. V. (Autor:in) / Bubennov, S. V. (Autor:in) / Kuvatova, R. Z. (Autor:in) / Kutepov, B. I. (Autor:in) / Maximov, A. L. (Autor:in)
Petroleum Chemistry ; 62 ; 843-852
01.08.2022
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Effects of Gel Preparation Conditions on the Crystallization of SAPO-11 Molecular Sieves
| Springer Verlag | 2024
Efficient adsorption of phenanthrene by simply synthesized hydrophobic MCM-41 molecular sieves
| British Library Online Contents | 2014