Ammonium complex of niobium as a precursor for the hydrothermal preparation of cellulose acetate/Nb2O5 photocatalyst

Prado, Alexandre G.S.; Faria, Elaine A.; Souza, Jurandir Rodrigues de; Torres, Jocilene D.

doi:10.1016/j.molcata.2005.04.055

Cited by 51 publications

(17 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The kinetic studies ( Figure 5) showed that the reaction reached the equilibrium at 3h with a yield of 98% under almost equimolar conditions, while a similar reaction described in the literature (between cyclohexenone and nitromethane) required a much larger excess of nitromethane, a temperature of 90 °C and a reaction time of 20 h by using propylamines supported on silica. 10 In order to understand this heterogeneous catalysis, the Langmuir-Hinshelwood kinetic model was applied to evaluate this reaction, 25,26 as represented in Figure 6.…”

Section: Catalytic Resultsmentioning

confidence: 99%

Tetramethylguanidine covalently bonded onto silica gel as catalyst for the addition of nitromethane to cyclopentenone

Oliveira¹,

Torres²,

Silva³

et al. 2006

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

Um catalisador baseado em sílica quimicamente modificada com tetrametilguanidina (TMG) foi sintetizado pela co-condensação de tetraetilortossilicato (TEOS) com um novo agente sililante, preparado pela reação entre a molécula TMG e (3-cloropropil)trimetoxisilano. O direcionador n-dodecilamina foi utilizado para organizar a polimerização do catalisador inorgânico-orgânico. A termogravimetria mostrou que o número de sítios ativos do catalisador foi de 1,35 mmol g .A espectroscopia na região do infravermelho e de ressonância magnética nuclear no estado sólido para os núcleos 29 Si e 13 C confirmou a obtenção do produto desejado. Este material foi usado para catalisar a adição de nitrometano em ciclopentenona. 98% de conversão foi observada depois de 3 h de reação. O catalisador foi recuperado e reutilizado por mais catorze vezes, mantendo uma eficiência catalítica em torno de 98%.A catalyst based on silica chemically modified with tetramethylguanidine (TMG) was synthesized by the co-condensation of tetraethylorthosilicate (TEOS) with a new silylant agent derived from the reaction between the TMG molecule and (3-chloropropyl)trimethoxysilane. A neutral n-dodecylamine template was used to organize the polymerization of the inorganicorganic catalyst. Thermogravimetry showed that the number of active pendant groups in the catalyst was 1.35 mmol g -1 , with a surface area of 811 ± 75 m 2 g -1. Infrared spectroscopy and 13 C and 29 Si nuclear magnetic resonance data are in agreement with the proposed structure. This material has been used to catalyse the addition of nitromethane to cyclopentenone. The catalytic efficiency was followed and the nitromethylcyclopentanone conversion presented a yield of 98% at 3 h of reaction. The catalyst was recovered and reused 14 times, maintaining about 98% of its catalytic efficiency.

show abstract

Section: Catalytic Resultsmentioning

confidence: 99%

Tetramethylguanidine covalently bonded onto silica gel as catalyst for the addition of nitromethane to cyclopentenone

Oliveira¹,

Torres²,

Silva³

et al. 2006

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…This technique presents many advantages over conventional technologies such as the dye degradation into innocuous final products [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, TiO 2 suspension in water presents a hydrocolloid with a high stability, which makes difficult the separation of this catalyst from water. Consequently, the recuperation and re-application of this catalyst in other photodegradation reactions becomes hard and with a low efficiency [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic decouloration of malachite green dye by application of TiO2 nanotubes

Prado

Costa

2009

Journal of Hazardous Materials

Self Cite

117

View full text Add to dashboard Cite

“…The consequent effects on environment and mankind are leading to efforts for the development of efficient technologies for water treatment in order to remove and/or degrade organic contaminants from water [1][2][3][4]. In this sense, photodegradation processes based on heterogeneous semiconductor catalysts have been extensively studied in recent years [3][4][5][6]. However, these methods are based on high energetic UV light excitation, which contains only 4-5% of the sunlight.…”

Section: Introductionmentioning

confidence: 99%

Hexagonal mesoporous silica modified with copper phthalocyanine as a photocatalyst for pesticide 2,4-dichlorophenoxiacetic acid degradation

DeOliveira

Neri

Ribeiro

et al. 2008

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

Ammonium complex of niobium as a precursor for the hydrothermal preparation of cellulose acetate/Nb2O5 photocatalyst

Cited by 51 publications

References 19 publications

Tetramethylguanidine covalently bonded onto silica gel as catalyst for the addition of nitromethane to cyclopentenone

Tetramethylguanidine covalently bonded onto silica gel as catalyst for the addition of nitromethane to cyclopentenone

Photocatalytic decouloration of malachite green dye by application of TiO2 nanotubes

Hexagonal mesoporous silica modified with copper phthalocyanine as a photocatalyst for pesticide 2,4-dichlorophenoxiacetic acid degradation

Contact Info

Product

Resources

About