Basic Catalysts
Mostrando 1-12 de 50 artigos, teses e dissertações.
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1. Biodiesel: An Overview II
The crescent number of scientific articles published per year shows that research on biodiesel continues to play an important role to support the growing demand for this biofuel. The second edition of Biodiesel: An Overview presents the worldwide research in the last 15 years. Microalgae biomass is the most studied raw material alternative in this period and
J. Braz. Chem. Soc.. Publicado em: 2021-07
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2. IMIDAZOL E CATÁLISE: UM PAR PERFEITO
The imidazole (IMZ) ring presents several chemical properties that turns it into a versatile acid-basic/nucleophilic catalyst. The discovery of the biological properties of histidine (amino acid with IMZ ring) instigates the study of this class of compounds. It is found in nature in several enzymes such as chymotrypsin and RNAses due to these properties. Thi
Quím. Nova. Publicado em: 2021-03
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3. BIODIESEL SYNTHESIS FROM WASTE COOKING OIL USING A VARIETY OF WASTE MARBLE AS HETEROGENEOUS CATALYSTS
Abstract The research article is based on biodiesel synthesis by the transesterification of waste cooking oil with methanol in the presence of heterogeneous catalysts prepared from different marble. Eight samples of marble were successfully converted into potential catalysts by calcination. The thermal treatment of waste marbles at 300oC-1000oC converted the
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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4. SYNTHESIS, CHARACTERIZATION AND EVALUATION OF THE HETEROGENEOUS BASIC CATALYST DAPTS-MCM-41 IN THE INTERESTERIFICATION REACTION OF PALM OIL AND PALM KERNEL OIL BLENDS
Abstract In recent years, the replacement of homogeneous catalysts by heterogeneous catalysts has been investigated as a sustainable alternative technology to obtain different products. In this context, this study investigated the activity of the heterogeneous catalyst DAPTS-MCM-41, obtained from the reaction between the MCM-41 molecular sieve and an organic
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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5. Photodegradation study of TiO2 and ZnO in suspension using miniaturized tests
ABSTRACT Miniaturization has been a trend in the instrumentation of chemical analyzes. The interest in miniaturization stems from the perceived benefits of faster, easier, less expensive and less wasteful analyzes than the tradition analyses. Thus, this work proposes a miniaturization of photocatalytic tests using a microplate reader for the analysis of seve
Matéria (Rio J.). Publicado em: 25/11/2019
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6. CHARACTERIZATION AND BEHAVIOUR OF PT CATALYSTS SUPPORTED ON BASIC MATERIALS IN DRY REFORMING OF METHANE
ABSTRACT Different basic materials, such as K-L zeolite, K-Al2O3, K-Mg/Al mixed oxide and MgO, were used as supports of Pt-catalysts for the dry reforming of methane (DR) reaction. The effects of the distribution of basic strength in the support on the metal-support properties and catalyst performance were evaluated. The density of strong and the total basic
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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7. Propriedades de adesivo aplicado em painéis a partir da substituição por lignossulfonato do processo sulfito
Resumo Considerando a indústria de painéis aglomerados, a maior parte utiliza adesivos sintéticos, especialmente, à base de ureia-formaldeído, e nesse sentido, estudos que englobam as características de materiais alternativas para a indústria de painéis tornam-se importantes, especialmente quando se considera o custo final dos produtos gerados. O pre
Ciênc. Florest.. Publicado em: 30/05/2019
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8. CHARACTERIZATION OF SEVERAL GENERATIONS OF NiMo HYDROPROCESSING CATALYSTS EMPLOYED IN THE SAME HYDROTREATER
This work details the chemical characterization of four NiMo/Al2O3 hydroprocessing generation catalysts (1979-1986, 1993-1998, 2003-2008 and 2008-2011) employed to perform hydrodesulfurization (HDS) of diesel fractions in the same hydrotreater of a Brazilian refinery. The basic differences are the quality of the feedstocks and the HDS experimental conditions
Quím. Nova. Publicado em: 27/05/2019
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9. Conflict as a possible catalyst for democratic relations in the work of the Family Health team
RESUMO Objetivo: Analisar as situações de conflito na equipe de atenção básica como possível catalisadoras de relações democráticas no trabalho, favorecendo a atuação em equipe. Método: Estudo qualitativo com equipe de saúde da família de um município do interior paulista. Os dados coletados incluíram observação sistemática e entrevista
Rev. esc. enferm. USP. Publicado em: 28/03/2019
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10. CONDENSAÇÃO ALDÓLICA DE FURFURAL E ACETONA CATALISADA POR BASES ORGÂNICAS NITROGENADAS: UM ESTUDO PRELIMINAR DE DESEMPENHO CATALÍTICO VISANDO A PRODUÇÃO DE BIOQUEROSENE DE AVIAÇÃO
The aldol condensation between furfural and acetone was studied in the presence of organic bases, such as Piperazine (PIP), 3-Aminopropyltriethoxysilane (APTES) and 1,5,7-Triazabicyclo [4.4.0] dec-5-ene (TBD), as basic catalysts. The latter base showed the highest conversion rates of furfural and high selectivity to the single-condensation product 4-(2-Furyl
Quím. Nova. Publicado em: 2018-06
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11. Catalytic Capture of CO2 with Template-Containing Zn/MCM-41 and Its Transformation to Solid Carbonate
Mesoporous MCM-41 materials modified by zinc have been prepared by non hydrothermal procedure. Zinc has been introduced by the direct synthesis (DS), template ion-exchange (TIE) and wet impregnation (WI) methods. The catalysts were characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy-scanning electron microscopy (EDX-SEM), thermogra
J. Braz. Chem. Soc.. Publicado em: 2016-12
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12. Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts
M-Co-Al (M = Ca, La, Li or Mg) materials were synthesised by co-precipitation and investigated for dry reforming of methane. Thermogravimetry, temperature-programmed oxidation, reduction and CO2 desorption, specific area and X-ray diffraction were utilised for characterisation. Activity tests were conducted at atmospheric pressure, temperatures between 400-5
Mat. Res.. Publicado em: 28/07/2014