Analytical Pyrolysis
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Study of Catalytic Pyrolysis of Biomass Sorghum (Sorghum bicolor L. Moench) Using Design of Experiments and Surface Response Methodology
This study proposes a screen of variables that have an influence on the modification of the bio-oil chemical composition as a unique critical quality attribute (CQA) throughout the pyrolytic process (zeolite, ZSM-5) by using a 24 full factorial design, followed by optimization through a response surface methodology (RSM) based on central composite design (CC
Journal of the Brazilian Chemical Society. Publicado em: 2023
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2. Preparation of Silicon Oxycarbide (SiCO) Ceramics from Different Polymer Architectures and Assessment on the Performance as Electrodic Materials for Voltammetric Sensing of Antioxidant Phenolic Compounds
Silicon oxycarbide (SiCO) ceramics obtained from polymer pyrolysis and with varied carbon contents were prepared and evaluated as new electrodic materials for sensing of tert butylhydroquinone (TBHQ) and butylated hydroxyanisole (BHA) antioxidants. Three polymers were synthesized varying molecular architecture and aromatic carbon groups, followed by pyrolysi
Journal of the Brazilian Chemical Society. Publicado em: 2022
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3. Combined Analytical Py-GC/MS, SEM, FTIR and 13C NMR for Investigating the Removal of Trace Metals from Aqueous Solutions by Biochar
In this study, the efficiency of biochar (BC) produced from sugarcane bagasse at different pyrolysis temperatures (300, 400, 500 and 600 ºC) for simultaneous removal of CdII, PbII, CuII, CrIII, NiII and ZnII ions from aqueous solutions was assessed. All BC were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), 13C nu
J. Braz. Chem. Soc.. Publicado em: 2020-07
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4. Espectrometria de Emissão Atômica em Filamento de Tungstênio (WCAES) : potencialidades e aplicações / Tungsten coil atomic emission spectrometry: potentialities and applications
This thesis describes the analytical application of WCAES for the determination of Ca, Al, Cs, Sr and Cr in samples with different compositions. In all studies the observation zone of the detector related to the coil was critically evaluated. In the first study, Ca was determined in mineral water, coconut water and juice samples. It was necessary the dilutio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/11/2012
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5. Geoquímica orgânica aplicada à formação Irati, área de Herval, Rio Grande do Sul (RS), bacia do Paraná / Organic geochemistry applied to Irati formation, Herval area of Rio Grande do Sul, Paraná basin
The current research had the main focus on the geochemical study of a borehole in the Parana Basin at Herval city (RS), aiming to fill some gaps in the organic geochemistry of the Irati Formation. Ten chemical-stratigraphic units were defined from analytical data of Total Organic Carbon (TOC), total sulfur, insoluble residue, gamma-rays, isotopes of organic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/05/2011
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6. Bagaço do sorgo: estimativa de parâmetros cinéticos e pirólise analítica
Pyrolysis is currently the one of the most important technologies for transforming biomass into more useful products to society. Aiming to deepen the knowledge of the kinetics of pyrolysis, this study conducted an exploratory study of the decomposition of sorghum bagasse by thermogravimetry analysis (TG). The physicochemical characterization of sorghum bagas
Publicado em: 2011
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7. Determinação de Cu e Fe em Biodiesel por Espectrometria de Absorção Atômica com Atomização Eletrotérmica e Estudo do Efeito Catalítico destes Metais sobre a Estabilidade Oxidativa do Biodiesel / Determination of Cu and Fe in Biodiesel by Absorption Spectrometry Electrothermal atomic and Study of the Effect of Catalytic Metals on the Oxidative Stability of Biodiesel
The metals content in biodiesel is directly related with the raw material used and also with the utilized biodiesel production method. In this work, an evaluation of the main metals present in biodiesel samples from different sources was done. The qualitative analysis of the metal content was assessed using the Inductively Coupled Plasma Mass Spectrometry te
Publicado em: 2011
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8. Espectrometria de absorção atômica como ferramenta analítica para determinação de elementos traço em biodiesel
In this work some procedures were developed for the determination of Na, K, Ca, Mg and P in biodiesel samples using atomic absorption spectrometry as an analytical tool. The determination of Na, K, Ca and Mg in biodiesel samples was performed using the technique of flame atomic absorption spectrometry (F AAS) and microemulsion as sample preparation. The opti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/04/2010
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9. A pirólise como técnica analítica
In this paper historical aspects of analytical pyrolysis, the equipment used, the fundamentals and the mechanisms of pyrolysis of different polymeric materials are discussed. The latest work on analytical pyrolysis applied to various types of synthetic and natural samples is reviewed. Current applications of this technique that are discussed include identifi
Química Nova. Publicado em: 2008
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10. Determinação da relação siringila/guaiacila da lignina em madeiras de eucalipto por pirólise acoplada à cromatografia gasosa e espectrometria de massas (PI CG/EM)
The use of analytical pyrolysis combined with gas chromatography/mass spectrometry (Py-GC/MS) to determine the syringyl/guaiacyl ratio (S/G) in lignins from Eucalyptus spp woods was investigated. Sample of E. grandis and "E. urograndis" wood, with and without extractives, were subjected to pyrolysis from 300 ºC to 600 ºC. The products that results from pyr
Química Nova. Publicado em: 2008
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11. Caracterização de extrativos de madeira de eucalyptus e depósitos de pitch envolvidos na fabricação de celulose e papel
The objective of this work was to study the chemical composition of lipophilic extracts from eucalyptus wood and compare it with the composition of dirt specks found in cellulose pulp. Gas chromatography coupled with mass spectrometry (GC-MS) and analytical pyrolysis were the main techniques used in the study. The exhaustive extraction of wood was carried ou
Publicado em: 2008
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12. Estudos de correlaÃÃo de parÃmetros tÃrmicos e de dissoluÃÃo do fluconazol na caracterizaÃÃo tecnolÃgica de desintegrantes
The real need to develop, to produce and to market drugs with high quality level, allied the diversity of products pharmaceutical resultant of different synthesis and purification processes, do one of the improvement of the control of quality of the raw materials of the great challenges of the pharmaceutical industries. The present work studies the correlati
Publicado em: 2008