Natural Zeolites
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. K2O SUPORTADO EM ZEÓLITA NATURAL: SÍNTESE, CARACTERIZAÇÃO E APLICAÇÃO PRODUÇÃO DE BIODIESEL A PARTIR DO ÓLEO DE GIRASSOL
Biodiesel is a renewable fuel, a substitute for fossil diesel, which is important for reducing GHG in Brazil. Therefore, this work aims to synthesize and characterize the catalyst using the support of natural zeolite impregnated with K2O and apply it in the production of biodiesel through the transesterification reaction. Through the analysis of characteriza
Química Nova. Publicado em: 2022
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2. ANAEROBIC DIGESTION OF WASTEWATER WITH HIGH SULFATE CONCENTRATION USING MICRO-AERATION AND NATURAL ZEOLITES
Abstract The behavior of anaerobic digestion in batch and UASB reactors using a microaerobic process and natural zeolites was studied. Laboratory assays were carried out across 4 sets of variables: different COD/SO42- ratios, different airflow levels, with and without natural zeolites and room and mesophilic controlled temperatures. The microaerobic process
Braz. J. Chem. Eng.. Publicado em: 2016-12
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3. Crystallization of Zeolite A Coatings from Natural Zeolite
An investigation was carried out to determine the possibility of preparing coatings of synthetic zeolites on stainless steel from mixtures containing natural zeolite. Hydrothermal synthesis was applied and the coatings obtained were characterized by various techniques. It was observed that crystalline zeolite A coatings could be prepared from natural clinopt
Mat. Res.. Publicado em: 10/11/2016
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4. RemoÃÃo de BTEX em SoluÃÃo Aquosa por AdsorÃÃo usando ZeÃlita SintÃtica Modificada. / Removal of BTEX in aqueous solution by adsorption using synthetic zeolite modified.
BTEX (benzene, toluene, ethylbenzene and xylenes) are organic compounds of particular concern due to their toxicity. BTEX occur in the environment as products of incomplete oxidation of fossil fuels, thus polluting the atmosphere. Also, the disposal of industrial effluents, oil spills, and fuels leaks at gas stations are sources of BTEX contamination in soil
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/04/2011
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5. Screening of supports for immobilization of commercial porcine pancreatic lipase
The aim of this work is to report the performance of different supports for the immobilization of commercial porcine pancreatic lipase. The immobilization tests were carried out in several types of Accurel, activated alumina, kaolin, montmorillonite, ion exchange resins and zeolites. The characterization of the supports showed differences in terms of specifi
Materials Research. Publicado em: 01/11/2011
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6. Adsorption of ions onto treated natural zeolite
This work presents studies of modification of a natural zeolite by activation with Na+ cations and functionalisation with Ba+2 and/or Cu2+ ions (FZ). The zeolite was characterized, modified and applied in adsorption studies of sulphate and isopropilxanthate ions as flocculated and powdered forms. The reuse of SO4Ba-FZ was investigated by adsorption-removal o
Publicado em: 2010
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7. Caracterização e aplicação de zeólitas naturais / Characterization and application of natural zeolites
Zeólitas são aluminossilicatos com arranjo estrutural composto por um esqueleto formado pela combinação tridimensional de tetraedros de AlO4 e SiO4, unidos entre si através de átomos de oxigênio. Sua estrutura apresenta canais e cavidades, nas quais se encontram moléculas de água e cátions trocáveis. Neste trabalho, amostras de zeólitas naturais,
Publicado em: 2010
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8. Degradação catalítica de polietileno de alta densidade sobre a zeólita HZSM
In last years it has talked a lot about the environment and the plastic waste produced and discarded. In last decades, the increasing development of research to obtain fuel from plastic material, by catalytic degradation, it has become a very attractive looking, as these tailings are discarded to millions worldwide. These materials take a long time to degrad
Publicado em: 2009
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9. Remoção de Pb2+ e Cr3+ em solução por zeólitas naturais associadas a rochas eruptivas da formação serra geral, bacia sedimentar do Paraná
The capacity of natural zeolites and its host rock (dacite) to remove Pb2+ and Cr3+ from aqueous solutions has been investigated. Results showed that both samples prefer to remove Pb2+ instead of Cr3+. Almost 100% of Pb2+ was removed from solutions with concentration until 50 mg L-1 and 100 mg L-1 of this metal, respectively by dacite and zeolite. The equili
Química Nova. Publicado em: 2009
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10. Purificação de acido clavulanico utilizando zeolitas. / Purification of clavulanic acid using zeolites.
In this research work, a method for separation and purification of clavulanic acid from a fermented medium was studied using natural and synthetic zeolites. The natural zeolite (ZN) and synthetic faujasite (13X) were modified by ionic exchange with different compensation cations (Na+1, K+1, Ca+2, Ba+2, Mg+2, Sr+2). The kinetic analysis by adsorption of clavu
Publicado em: 2008
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11. Aplicação de adsorção para remover amônia de efluentes suinícolas pré-tratados
The aim of this work is to evaluate the use of natural zeolites to remove the NH4+ that remains in effluents from swine facilities which were submitted to physico-chemical and biological treatments. Experiments were made in batch made adding 5% (w/w) of adsorbent (0.6-1.3 and 3.0-8.0 mm) to synthetic and real swine facilities effluents. The results show that
Química Nova. Publicado em: 2008
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12. Perdas por volatilização e eficiência agronômica da mistura de uréia com zeolita natural aplicada na cultura da roseira (Rosa spp.) / Losses by volatilization and agronomical efficiency in the use of nitrogen obtained from urea of natural zeolites in rose trees (Rosa spp.).
O trabalho objetivou avaliar as perdas de N-NH3 por volatilização (PNV) e a eficiência agronômica dos fertilizantes zeolíticos obtidos através de misturas de uréia com zeolitas naturais. O primeiro experimento foi realizado na casa de vegetação da Embrapa Solos, RJ, sendo as unidades experimentais compostas por bandejas plásticas preenchidas com so
Publicado em: 2008