Basicity determination of SBA-15 doped with different alkaline metals through CO2 adsorption and isopropanol decomposition
Open Access
- 30 June 2020
- journal article
- Published by European Journal of Chemistry in European Journal of Chemistry
- Vol. 11 (2), 100-104
- https://doi.org/10.5155/eurjchem.11.2.100-104.1960
Abstract
In order to increase the activity and selectivity towards to light olefins in the Fischer-Tropsch synthesis, new support for the role of iron (Fe) are presented. Thus, SBA-15 was synthetized and doped with different alkaline metals preserving the structural characteristics of the mesoporous solid. The samples were characterized by X-ray diffraction at low angles, N2 adsorption, atomic absorption spectroscopy, CO2 desorption at programmed temperature and isopropanol test. The alkaline metals (Li, K and Cs) introduction into the channels of the solid, generate basic sites of different strength that are not present in the SBA-15 without doping and do not produce significant changes in the structural and textural properties of the SBA-15, only a densification in the walls of the channels is evidenced. According to the alkaline metal used and through CO2 adsorption and isopropanol decomposition, it was possible to established the order by the total number of sites: Li >> K » Cs, and the force order for both types of sites (weak and intermediate): Li > Cs > K.Keywords
This publication has 15 references indexed in Scilit:
- Effect of the activation atmosphere on the activity of Fe catalysts supported on SBA-15 in the Fischer–Tropsch SynthesisJournal of Catalysis, 2011
- Fischer-Tropsch Synthesis: Catalyst activation of low alpha iron catalystCatalysis Today, 2009
- Iron-catalyzed propylene epoxidation by nitrous oxide: Effect of boron on structure and catalytic behavior of alkali metal ion-modified FeOx/SBA-15Journal of Catalysis, 2008
- Study on humidity sensing properties based on composite materials of Li-doped mesoporous silica A-SBA-15Sensors and Actuators B: Chemical, 2008
- Fischer–Tropsch synthesis: induction and steady-state activity of high-alpha potassium promoted iron catalystsApplied Catalysis A: General, 2003
- Fischer−Tropsch synthesis: activity and selectivity for Group I alkali promoted iron-based catalystsApplied Catalysis A: General, 2002
- XPS and TPD characterization of manganese-substituted iron–potassium oxide catalysts which are selective for dehydrogenation of ethylbenzene into styreneApplied Catalysis A: General, 2001
- Nonionic Triblock and Star Diblock Copolymer and Oligomeric Surfactant Syntheses of Highly Ordered, Hydrothermally Stable, Mesoporous Silica StructuresJournal of the American Chemical Society, 1998
- New unusually strong solid basic material derived from KL zeolite impregnated with KNO3Materials Letters, 1997
- On Some Problems of Selectivity in Syngas Reactions on the Group VIII MetalsCatalysis Reviews, 1987