High surface area tin oxide

Hagemeyer, Alfred; Hogan, Zach; Schlichter, Marco; Smaka, Birgit; Streukens, Guido; Turner, Howard W.; Volpe, Anthony F.; Weinberg, Henry; Yaccato, Karin

doi:10.1016/j.apcata.2006.09.040

Cited by 64 publications

(42 citation statements)

References 8 publications

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“…A síntese do SnO 2 nanoparticulado foi realizada como previamente proposto [15] [17,18]. Em um processo típico, uma mistura de ácido cítrico (50% em massa) foi adicionada a etileno glicol (20% em massa) até total dissolução a 70 o C. Após a dissolução, o precursor iônico (citrato de estanho, nitrato de níquel, acetato de magnésio, nitrato de ferro, nitrato de cromo) foi adicionado nas relações estequiométricas desejadas até total dissolução.…”

Section: Sínteseunclassified

Determinação das energias de superfície do SnO2 puro e dopado

Castro

Hidalgo²,

Gouvêa³

et al. 2009

Cerâmica

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INTRODUÇÃOO desenvolvimento de novos nanomateriais é fortemente dependente do controle da estabilização destas nanoestruturas. Quando considerando sínteses bottomtop, podem ser definidos dois métodos básicos de controle das nanoestruturas para gerar estabilização e indução de formatos e tamanhos desejados: o método termodinâmico e o cinético [1]. Particularmente centrando na síntese via líquida de nanopartículas, a aproximação termodinâmica considera que na nucleação existe um raio crítico mínimo relacionado com um balanço entre a energia de volume e a energia de superfície. Como fortemente dependente da energia de superfície, a modulação desta energia é indicada como uma forma natural de controle do tamanho mínimo das nanopartículas [1,2]. No entanto, após a nucleação, o fenômeno de crescimento ocorre espontaneamente, desde que existe uma barreira de energia para nuclear uma nova nanopartícula que, em geral, é maior que aquela para crescer a nanopartícula já nucleada. Para controlar este crescimento, adotam-se soluções usualmente cinéticas. No entanto, observando os modelos de crescimento de nanopartícula por síntese em fase líquida, verifica-se que a energia de superfície tem influência direta também no crescimento do tamanho da partícula em conjunto com o coeficiente de difusão. Isto é, para um processo controlado por difusão, o tamanho médio Mg, Fe, Cr, and Ni.

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Section: Sínteseunclassified

Determinação das energias de superfície do SnO2 puro e dopado

Castro

Hidalgo²,

Gouvêa³

et al. 2009

Cerâmica

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“…Supported noble metals are the most commonly used catalysts, and account for 75% of all industrial VOC removal applications [69]. The most common support for these noble metal catalysts is alumina, although catalysts on alternative supports such as silica [71], titania, zirconia, carbon [72] and SnO 2 [73][74][75][76] have been described. There are also applications for metal oxide catalysts for total VOC combustion, although these have lower activity than the noble metals.…”

Section: Introductionmentioning

confidence: 99%

“…(b) SMS screening data for catalysts described in (a) for WGS. (i) shows all catalysts at three temperatures together; (ii), (iii) and (iv) show the three temperatures as separate plots.carbons, and niobias, as well as proprietary high-surface area CeO 2 , Y 2 O 3 , SnO 2[75,76], and Co 3 O 4 .Figure8a and b show a typical thermographic image of a 256-element library of RuM1/Co 3 O 4 candidate catalysts with CO fed into the reactor chamber. Clear ''hits'' are identified for M1 = Co and Ce (for all the metal precursors tested), with a total temperature rise comparable to that of the Pt on alumina standards.…”

mentioning

confidence: 98%

High throughput discovery of CO oxidation/VOC combustion and water–gas shift catalysts for industrial multi-component streams

et al. 2006

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High-throughput and combinatorial approaches have been applied to the discovery of catalysts for selective low temperature CO oxidation/VOC removal using mixed CO/propylene feeds, and for the water-gas shift (WGS) reaction using real post-reformer feeds containing CO, CO 2 , H 2 O and H 2 . The screening approach was based on a hierarchy of qualitative and semi-quantitative primary screens for the discovery of hits, and quantitative secondary screens for hit confirmation, lead optimization and scale-up. For WGS, primary screening was carried out using scanning mass spectrometry. For CO oxidation and VOC removal, parallel IR thermography was the primary screen. Multi-channel fixed bed reactors equipped with imaging reflection FTIR spectroscopy or GC were used for secondary screening. Novel RuCoCe compositions were discovered and optimized for CO oxidation/VOC removal and the effect of doping was investigated for supported and bulk mixed oxide catalysts. For WGS, noble metal-free and Pt-doped CoFeRu mixed oxides as well as Pt on CeO 2 and Pt on CeO 2 /ZrO 2 were investigated and a new synergistic PtFeCe ternary composition was discovered. In these cases oxygen vacancies in the ceria lattice are believed to play a key role in the strong and synergistic Pt-Ce interaction. Alkaline metal doping was found to enhance the selectivity towards WGS by suppressing the unselective methanation side reaction and to increase the low temperature catalytic activity.

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“…[22][23][24][25][26] Mixed metal oxides exhibit strong surface acidity (Bronsted or Lewis) due to the generation of excess negative or positive charge in the model structure of the binary oxides. Recently, Mesoporous SiO 2 has been proved to be an extensively significant new kind of functional material with regular channels, large surface area, high thermal stability and tunable pore sizes over a wide range.…”

Section: -13mentioning

confidence: 99%

SnO₂/SiO₂Nanocomposite Catalyzed One-Pot Synthesis of 2-Arylbenzothiazole Derivatives

Yelwande¹,

Navgire²,

Tayde³

et al. 2012

Bulletin of the Korean Chemical Society

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SnO 2 /SiO 2 nanocomposite has been synthesized by using sol-gel method. Prepared catalytic materials has been well characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmer-Teller (BET) surface area, and temperature-programmed desorption of ammonia (NH 3 -TPD). SnO 2 /SiO 2 nanocomposite catalyzed synthesis of 2-arylbenzothiazoles by the cyclocondensation of 2-aminothiophenol and aromatic aldehydes under reflux condition in 1:1 EtOH:H 2 O. After completion of the reaction, catalyst can be recovered efficiently and reused with consistent activity.

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High surface area tin oxide

Cited by 64 publications

References 8 publications

Determinação das energias de superfície do SnO2 puro e dopado

Determinação das energias de superfície do SnO2 puro e dopado

High throughput discovery of CO oxidation/VOC combustion and water–gas shift catalysts for industrial multi-component streams

SnO₂/SiO₂Nanocomposite Catalyzed One-Pot Synthesis of 2-Arylbenzothiazole Derivatives

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High surface area tin oxide

Cited by 64 publications

References 8 publications

Determinação das energias de superfície do SnO2 puro e dopado

Determinação das energias de superfície do SnO2 puro e dopado

High throughput discovery of CO oxidation/VOC combustion and water–gas shift catalysts for industrial multi-component streams

SnO2/SiO2Nanocomposite Catalyzed One-Pot Synthesis of 2-Arylbenzothiazole Derivatives

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SnO₂/SiO₂Nanocomposite Catalyzed One-Pot Synthesis of 2-Arylbenzothiazole Derivatives