Buscar
Mostrando ítems 1-10 de 217
Kinetic and mechanistic study of triose sugar conversion on Lewis and Brønsted acid solids
(Elsevier B.V., 2017-12)
The effect of catalyst acid site nature on the reaction kinetics of the liquid-phase conversion of dihy-droxyacetone with ethanol was investigated using Brønsted and Lewis acid solids. The reaction proceedsthrough a complex ...
CHRYSOTILE-SUPPORTED TRANSITION-METAL SALTS AS FRIEDEL-CRAFTS CATALYSTS
(Soc Brasileira QuimicaSao PauloBrasil, 1995)
Tailored Brønsted and Lewis surface acid sites of the phosphotungstic Wells Dawson heteropoly-acid
(Elsevier Science, 2019-11)
The synthesis of transition metals Wells Dawson heteropoly salts along with their elemental composition, water content, structure and specific surface area were thoroughly investigated. Additionally, the use of a molecular ...
Cobalt-catalyzed fischer–tropsch synthesis: chemical nature of the oxide support as a performance descriptor
(American Chemical Society, 2015-04-20)
Synthesis of ethyl lactate from triose sugars on Sn/Al2O3 catalysts
(Elsevier Science, 2016-05)
Sn-promoted alumina catalysts with different Sn loadings (1-8 wt.%) were prepared by impregnation and characterized by N2 physisorption, X-ray diffraction, UV-vis-DRS, FTIR of pyridine and TPD of NH3. Surface Sn species ...
Acidity evolution on highly dispersed chromium supported on mesostructured silica: The effect of hydrothermal treatment and calcination temperature
(Elsevier Science, 2020-03-01)
Mesoporous Cr-MCM-41 catalysts were synthesized, under different hydrothermal temperatures, by the sol-gel procedure using tetraethylorthosilicate (TEOS) as silica precursor and cetyltrimethylammonium bromide (CTAB) as a ...
Funcionalización de un composito de SiO2-C para su utilización como soporte catalítico
(Asociación Química Argentina, 2017-05-24)
En el presente trabajo se estudió el proceso de funcionalización de un composito mesoporoso de SiO2-C utilizando ácido nítrico como agente oxidante y diferentes condiciones de temperatura (80-100°C),concentración de ácido ...
Valorización catalítica de triosas: obtención de ésteres del ácido láctico y otros oxigenados valiosos
(2017-06-30)
En esta tesis se investigó la transformación en fase líquida de un compuesto hidroxicarbonílico obtenido durante la conversión de azúcares en las biorefinerías, la dihidroxiacetona (DHA). El objetivo fue convertir DHA en ...
Síntese e caracterização de fases de líquidos iônicos imobilizadas em polímero contendo triflato de escâncio
(Universidade Federal de São Paulo, 2022-04-29)
O uso de líquidos iônicos em reações orgânicas é bem explorado na literatura, porém o seu alto custo e sua elevada viscosidade representam dificuldades para sua aplicação em escala industrial. Estas limitações podem ser ...