Cocl2
Mostrando 1-12 de 92 artigos, teses e dissertações.
-
1. KINETIC STUDIES OF HYDROLYSIS REACTION OF NaBH4 WITH γ-Al2O3 NANOPARTICLES AS CATALYST PROMOTER AND CoCl2 AS CATALYST
Abstract Solid-state hydrogen storage is of considerable concern as a potential hydrogen source for portable fuel cell applications. This study mainly focuses on kinetics of NaBH4/Al2O3 nanoparticles (20 nm)/H2O system with CoCl2 as catalyst and the factors that affect the hydrogen generation rate (HGR). It is observed that the reaction rate increases consid
Braz. J. Chem. Eng.. Publicado em: 30/09/2019
-
2. Estudio de la composición de una fase gaseosa por FTIR. Cloración de MoO3 en presencia de carbón de fructosa
ABSTRACT Chlorination and carbochlorination studies available in the literature were conducted using gravimetric and thermogravimetric techniques. These studies were focused on the overall reaction through analysis of the condensed reaction products, thermodynamic calculations and mass change generated during the reaction. The composition of the gaseous phas
Matéria (Rio J.). Publicado em: 19/07/2018
-
3. Catalytic hydrogen generation from NaBH 4 /H 2 O system: effects of catalyst and promoters
Abstract A hydrogen generation system based on NaBH4 hydrolysis is affected by the nature of the catalyst and catalyst promoter. Various catalyst promoters such as Al2O3 nanoparticles, Al2O3 particles, ZrO2 sand, SiO2, MMT clay, CNT and zeolite are compared with respect to hydrogen generation (HG) and hydrogen generation rate (HGR). The highest HG and HGR ar
Braz. J. Chem. Eng.. Publicado em: 2018-01
-
4. Control of Acid Phosphatases Expression from Aspergillus niger by Soil Characteristics
ABSTRACTThis work studied the acid phosphatase (APase) activity from culture medium (extracellular, eAPase) and mycelial extract (intracellular, iAPase) ofAspergillus niger F111. The influence of fungus growth and phosphate concentration of the media on the synthesis and secretion of phosphatase was demonstrated. The effects of pH, substrate concentration an
Braz. arch. biol. technol.. Publicado em: 2015-10
-
5. Adsorption of Transition Metal Chlorides by Silica with Grafted 1-n-Propyl-3-Methylimidazolium Chloride
Silica with grafted 1-n-propyl-3-methylimidazolium chloride was investigated as adsorbent for the removal of cobalt(II), copper(II), zinc(II), cadmium(II) and mercury(II) chlorides from alcoholic and aqueous solutions. The adsorption proceeds via the formation of metal-chloride anionic complexes detained near the grafted organic cations as counterions. This
J. Braz. Chem. Soc.. Publicado em: 2015-06
-
6. Kinetical study about the cobalt electrodeposition onto polycrystalline platinum
An electrochemical study of Co electrodeposition onto polycrystalline Pt from an aqueous solution containing 10-2 M CoCl2 + 1 M NH4CI (pH = 9.3) was conducted at overpotential conditions. The current density transients showed two maxima that corresponded to two nucleation and growth processes. The entire transient behavior was adequately predicted considerin
Quím. Nova. Publicado em: 2013
-
7. Avaliação do Fator Induzido Pela Hipoxia 1-Alfa no Retinoblastoma
Introdução: o Retinoblastoma é o tumor intra-ocular maligno mais comum na infância. Pacientes com tumores avançados, em geral, respondem mal ao tratamento. Hipóxia é um fenômeno comum aos tumores avançados e está relacionada à resistência à quimio e radioterapia convencional. As células e os tecidos tumorais adaptam-se ao microambiente hipóxic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/03/2012
-
8. Metal chloride hydrates as Lewis acid catalysts in multicomponent synthesis of 2,4,5-triarylimidazoles or 2,4,5-triaryloxazoles
Uma série de nove hidratos de cloretos metálicos (ZnCl2.2H2O, SnCl2.2H2O, CdCl2.2H2O, MnCl2.4H2O, CoCl2.6H2O, SrCl2.6H2O, NiCl2.6H2O, CrCl3.6H2O e CeCl3.7H2O) foi investigada como catalisadores ácidos de Lewis brandos e baratos na síntese multicomponente de triarilimidazóis. O melhor catalisador para as reações com benzila foi o SnCl2.2H2O, enquanto q
Journal of the Brazilian Chemical Society. Publicado em: 2012-01
-
9. Síntese, caracterização e estudo das propriedades magnéticas de um polímero de coordenação contendo cobalto(II) e cobre(II)
This work describes the synthesis and characterization of two new compounds with ligand opy (N-(2-pyridyl)oxamate): the copper(II) precursor [Me4N]2[Cu(opy)2].5H2O and CoII CuII coordination polymer {[CoCu(opy)2]}n×4nH2O. This latter compound was obtained by reaction of [Me4N]2[Cu(opy)2].5H2O and CoCl2.6H2O in water. The heterobimetallic CoII CuII chain was
Quím. Nova. Publicado em: 2012
-
10. Obtenção de compostos orgânicos polifuncionalizados, a partir de diaziridinonas, em reações catalisadas por cloreto de cobalto (II) / Obtaintion of polyfunctionalized organic compounds, from diaziridinones, in reactions catalysed by cobalt (II) chloride
Anéis de três membros são considerados excelentes reagentes de partida para a síntese orgânica. Dentre estes, destacamos as diaziridinonas, que são heterociclos de três membros contendo dois átomos de nitrogênio e um grupo funcional carbonílico exocíclico, e comportam-se como uma classe especial destes heterociclos. Diaziridinonas que possuem subs
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
-
11. Establishment of sensitive and resistant variety of tomato on the basis of photosynthesis and antioxidative enzymes in the presence of cobalt applied as shotgun approach
Cobalt (Co) affords both beneficial as well as toxic effects to plants. The present study was performed with an aim to find out the varietal differences among five tomato cultivars against the Co induced changes in growth, photosynthesis, nitrate reductase (E.C.1.6.6.1), carbonic anhydrase (E.C.4.2.1.1), antioxidative enzymes i.e. peroxidase (E.C.1.11.1.7),
Brazilian Journal of Plant Physiology. Publicado em: 2011
-
12. Metal halide hydrates as lewis acid catalysts for the conjugated friedel-crafts reactions of indoles and activated olefins
O uso de haletos metálicos hidratados, tais como, SnCl2·2H2O, MnCl2·4H2O, SrCl2·6H2O, CrCl2·6H2O, CoCl2·6H2O e CeCl3·7H2O como catalisadores ácidos de Lewis foi investigado nas reações conjugadas tipo Friedel-Crafts entre indóis e olefinas ativadas. A utilização de enonas alifáticas forneceu as respectivas β-indolilcetonas à temperatura ambie
Journal of the Brazilian Chemical Society. Publicado em: 2011