Um novo procedimento de síntese da zeólita A empregando argilas naturais

Rigo, Reus T.; Pergher, Sibele B. C.; Petkowicz, Diego Ivan; Santos, João Henrique Zimnoch dos

doi:10.1590/s0100-40422009000100004

Cited by 21 publications

(16 citation statements)

References 6 publications

(8 reference statements)

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“…Foram realizados procedimentos de síntese variando a razão Si/Al. A amostra ZA foi sintetizada utilizando procedimento descrito síntese da zeólita A [26]. As amostras ZA1 e ZA2 foram sintetizadas com modificações neste procedimento.…”

Section: Síntese Dos Materiais Zeolíticosunclassified

Síntese de zeólitas utilizando resíduo sílico-aluminoso proveniente do processo de extração de lítio

et al. 2013

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ResumoUtilizou-se um resíduo sílico-aluminoso como fonte de SiO 2 e Al 2 O 3 para síntese de zeólitas. O resíduo é um subproduto do processo de extração de lítio do ß-espodumênio. Os produtos sintetizados caracterizaram-se por uma mistura de fases zeolíticas e compostos presentes no resíduo, que não foram solubilizados. Quando a relação Si/ Al foi ajustada para 1, foi formada uma mistura de fases zeólita A + sodalita e zeólita NaP + sodalita. A mistura de fases zeólita A + sodalita foi obtida deixando o resíduo sílico-aluminoso em agitação por 2 h a 80 o C, antes da adição de aluminato de sódio e posterior cristalização por 4 h. Quando a mistura resíduo e NaOH ficou em estático a 100 o C por 4 h, nesta mesma etapa, o produto formado foi uma mistura de sodalita + zeólita NaP. O aumento da razão Si/Al para 3,2, uma etapa de envelhecimento e maiores tempos de cristalização, levou a formação de uma mistura de fases NaP1 e quartzo pertencente ao resíduo. Palavras-chave: resíduo sílico-aluminoso, zeólita A, sodalita, zeolita NaP, NaP1. Abstract In this study we used a silico-aluminous residue as a source of SiO

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Section: Síntese Dos Materiais Zeolíticosunclassified

Síntese de zeólitas utilizando resíduo sílico-aluminoso proveniente do processo de extração de lítio

et al. 2013

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“…After the addition of the enzyme to the substrates, the mixture was kept at 40 °C and 150 rpm for 40 minutes. Then, the oleic acid consumption was determined 18 . One lipase activity unit (UE) was defined as the amount of enzyme necessary to consume 1µmol of oleic acid per minute at the established experimental conditions presented previously.…”

Section: Enzymementioning

confidence: 99%

Screening of supports for immobilization of commercial porcine pancreatic lipase

et al. 2011

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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 specific area and morphology. The characteristics of the supports influenced the amount of enzyme adsorbed, yield of immobilization and esterification activity of the resulting immobilized catalyst. The clays KSF and natural and pillared montmorillonites presented potential for use as support for lipase immobilization in terms of yield and esterification activity. Yields of immobilization of 76.32 and 52.01% were achieved for clays KSF and natural montmorillonite, respectively. Esterification activities of 754.03, 595.51, 591.88 and 515.71 U.g -1 were obtained for lipases immobilized in Accurel MP-100, Amberlite XAD-2, mordenite and pillared montmorillonite, respectively.

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“…Although there have been many studies related to the synthesis of zeolite Afrom kaolin [1][2][3][4], it is important to consider the different characteristics of this clay mineral when derived from different regions, which can directly influence the yield of the final synthesis product. In Brazil, the kaolin reserves are almost entirely concentrated (93%) in the sedimentary deposits of the three largest kaolin districts in the country: Rio Capimin the State of Para,Jaríin the State of Amapáand a third deposit in the State of Amazon.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Zeolite A employing Amazon kaolin waste

et al. 2015

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The synthesis of zeolite A employing kaolin waste from paper coating was studied. The kaolin waste was pre-treated at 550 to 800 °C. For comparison purposes, a sample of zeolite A was also prepared using the IZA procedure. The materials were characterized by 27Al MAS NMR, X-ray diffraction and scanning electron microscopy using a microprobe. Pretreatment was necessary, and the best temperatures were between 600 and 700 °C. The zeolite A formation was observed in all the prepared materials, reaching 52% crystallinity. On the other hand, the sodalite phase and amorphous materials were also formed.

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Um novo procedimento de síntese da zeólita A empregando argilas naturais

Cited by 21 publications

References 6 publications

Síntese de zeólitas utilizando resíduo sílico-aluminoso proveniente do processo de extração de lítio

Síntese de zeólitas utilizando resíduo sílico-aluminoso proveniente do processo de extração de lítio

Screening of supports for immobilization of commercial porcine pancreatic lipase

Synthesis of Zeolite A employing Amazon kaolin waste

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