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Mostrando ítems 5641-5650 de 13091
Preparation of Ni/SiO2, Ni/SiO2-CaO and Ni/SiO2- MgOcatalysts for methane steam reforming
(2007)
The preparation of mesoporous silica-supported nickel, by adding nickel nitrate and citric acid into a colloidal dispersion of sphere-shaped silica nanoparticles, was described in this work. The promotion with calcium and ...
Continuous soluble Ziegler-Natta ethylene polymerizations in reactor trains, 3 - Influence of operating conditions upon process performance
(2008)
The behavior of continuous solution ethylene/but-1-ene polymerizations through Ziegler-Natta catalysts is analyzed, based on a previously developed mathematical model. In order to do that, dynamic simulations are carried ...
Continuous soluble Ziegler-Natta ethylene polymerizations in reactor trains, 2 -estimation of kinetic parameters from industrial data
(2008)
We show that it is possible to estimate kinetic parameters for complex mechanistic polymerization models from available industrial data. A methodology is developed for efficient handling and reconciliation of industrial ...
Ação promotora do zinco em catalisadores de síntese do estireno
(2004)
Ethylbenzene dehydrogenation in the presence of steam is the main commercial route to produce styrene. The industrial catalyst is chromium and potassium-doped hematite, which easily deactivates with time due to potassium ...
Utilização de catalisadores sintéticos híbridos (nanofolhas de titânio com pozzolana e caulim com diferentes polissiloxanos) e resíduo industrial siderúrgico (carepa) para a redução fotocatalítica de Cr(VI) em matriz aquosa
(2020)
A espécie de cromo hexavalente é altamente tóxica e cancerígena; por isso a redução de Cr(VI) a Cr(III) torna-se bastante relevante. Este trabalho apresenta um estudo sobre a aplicação de catalisadores de três fontes ...
Síntese de furanos trissubstituídos via reações de oxopaladação aeróbica
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Química - PPGQCâmpus São Carlos, 2019-02-25)
Furans are important heterocyclics with broad application in synthesis as a building block, frequently presented in a wide range of compounds that exhibit biological activity, including natural products. Intramolecular ...
Influência de parâmetros experimentais na Síntese de Poli (l-ácido lático)
(Universidade Tecnológica Federal do ParanáCampo Mourao, 2013-04-30)
The productivity of industrial polymerization plants is highly dependent on the conversion rates. In the polymerization of L lactide the presence of water traces must be avoided due to their negative influence on the ...
A oxidação direta do glicerol com o uso de catalisadores macrocíclicos porfirínicos
(Universidade Tecnológica Federal do ParanáApucaranaBrasilTecnologia em Processos QuímicosUTFPR, 2013-04-05)
In an attempt to reduce dependence on non-renewable resources, we have researched a lot about alternative sources of biofuel production in the world. Biodiesel is a renewable source and its production is in rapid growth ...
Methoxycarbonylation of olefins catalyzed by palladium complexes bearing P,N-donor ligands
(2007)
The methoxycarbonylation of alkenes catalyzed by palladium(ii) complexes with P,N-donor ligands, 2-(diphenylphosphinoamino)pyridine (Ph 2PNHpy), 2-[(diphenylphosphino)methyl]pyridine (Ph 2PCH2py), and 2-(diphenylphosphin ...
Kinetic and in situ FTIR study of CO methanation on a Rh/Al
(Royal Society of Chemistry, 2015)
© The Royal Society of Chemistry 2015.Carbon monoxide hydrogenation was studied over a γ-alumina-supported 1 wt% Rh catalyst by means of kinetic and in situ infrared measurements. The study was carried out at 200-300 °C, ...