Kinetic study of template removal of Al-MCM-41 synthesized at room temperature

Macedo, Cristiane P. de; Negrão, Charles Alberto Brito; Macedo, Luiz Guilherme Machado de; Zamian, José Roberto; Filho, Geraldo Narciso da Rocha; Costa, Carlos Emmerson Ferreira da

doi:10.1007/s10973-013-3267-0

Cited by 8 publications

(2 citation statements)

References 28 publications

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“…The surfactant is removed during calcination at high temperatures. In general, it is necessary to study the surfactant removal kinetics in order to prevent the destruction of the ordered silica structure by a misplaced calcination [9,10].…”

Section: Introductionmentioning

confidence: 99%

Kinetic study of CTMA+ removal from the pores of the Ti-MCM-41 molecular sieve

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Melo

Barros

et al. 2014

J Therm Anal Calorim

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Thermogravimetry analysis was used to study the thermal decomposition of Ti-MCM-41 to determine the best calcination conditions. Ti-MCM-41 molecular sieve was synthesized using a hydrothermal route in which Ti ions were incorporated into the pore channels of MCM-41 starting from a hydrogel method according to the following molar composition: 1.00 CTMABr:4.00 SiO 2 :X TiO 2 :1.00 Na 2 O:200.00 H 2 O. Physicochemical properties of samples were investigated using XRD, FTIR, and N 2 adsorptiondesorption to confirm the incorporation of TiO 2 nanoparticles inside of MCM-41 mesoporous without destroying its structure. The high temperatures facilitate the rapid removal of the surfactant; however, it caused destruction of the MCM-41 structure by breaking the bonds of the silica tetrahedral structure. The procedures to obtain the apparent activation energies of CTMABr decomposition were based on the kinetic model proposed by Flynn-Wall using thermal analysis of data performed with heating rates 5, 10, and 20 °C min -1 .

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Section: Introductionmentioning

confidence: 99%

Kinetic study of CTMA+ removal from the pores of the Ti-MCM-41 molecular sieve

Fontes

Melo

Barros

et al. 2014

J Therm Anal Calorim

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“…Forage crops, consisting of around 80 % Brachiaria grasses, are of great importance for the tropical Americas, Oceania and part of the Asiatic countries, being the base for beef and milk production, as well as for sheep and equine rearing (Macedo, 2006).…”

Section: Introductionmentioning

confidence: 99%

Introduction of the neMDH gene in Urochloa brizantha for Aluminium Tolerance in Agronomic Assays

Rocha¹,

Keila²,

Luiz³

et al. 2014

GJAS

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Agricultural production in acid soils constituting about half of the total arable land on Earth, is limited by aluminium toxicity, which is manifested by root growth reduction, decreasing nutrients and water absorption by the plant. This work evaluated aluminium resistance in genotypes of Brachiaria brizantha cv. MG4, transformed with the neMDH gene, by using a nutrient solution for agronomic evaluation and gene integration confirmation by PCR. Three from the five confirmed transformed genotypes of B. brizantha cv. MG4 with the neMDH gene presented tolerance to aluminium solutions (111 µmol L-1 and 444 µmol L-1). Two from those three genotypes also showed higher dry weight production in comparison to the wild-type genotype.

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