Metal dispersion and catalytic activity of trimetallic Pt-Re-Sn/Al2O3 naphtha reforming catalysts

Pieck, C.L.; Vera, Carlos Román; Parera, J.M.; Giménez, Gustavo; Serra, Luciano R.; Carvalho, Luciene Santos de; Rangel, M.C.

doi:10.1016/j.cattod.2005.07.040

Cited by 49 publications

(31 citation statements)

References 26 publications

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“…On the other hand, for the same Pt and well with studies on supported Re catalysts reported by different groups [11,12,20,30]. In the present study, the degree of Re reduction may be limited by the temperature used (280 °C) [31] and thus the available surface binding sites for CO adsorption are negligible considering that CO does not adsorb on ReO x species [28,32] and that the adsorption temperature ( and acids (lactic acid (LA) and acetic acid (AA)) which were quantified by HPLC (results can be found in Table 2). Trace amounts of other intermediate products in the liquid phase were also identified, such as glyceraldehyde and pyruvaldehyde, but not quantified.…”

Section: 1supporting

confidence: 85%

“…Apparently, loading of Pt, Re, or Pt-Re to the carbon support has negligible effect on its BET surface area, suggesting that Pt, Re, or Pt-Re are highly dispersed and there is minimum pore plugging by loading these metals. [11,20,28] to determine the Pt dispersion which is generally accepted for this application. The stoichiometry of CO/Pt is assumed to be 1.…”

Section: 1mentioning

confidence: 99%

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Elucidation of the roles of Re in steam reforming of glycerol over Pt–Re/C catalysts

Wei

Karim

et al. 2015

Journal of Catalysis

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In this paper, we report the fundamental understanding of surface properties of Pt/C and Pt-Re/C catalysts and their correlation with catalytic performance in steam reforming of glycerol. We found that the addition of Re increases the catalytic activity, H 2 /CO x ratio and CO 2 selectivity. N 2 physisorption, CO chemisorption, attenuated total reflectance infrared (ATR-IR), Raman and Xray absorption spectroscopy (XAS) with in situ capabilities were employed to provide the insights into the roles of Re. Using ATR-IR, we show that CO adsorption

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Section: 1supporting

confidence: 85%

Section: 1mentioning

confidence: 99%

Elucidation of the roles of Re in steam reforming of glycerol over Pt–Re/C catalysts

Wei

Karim

et al. 2015

Journal of Catalysis

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“…40 Por outro lado, em escala nanométrica, os catalisadores bifuncionais têm sido documentados como exercendo um papel importante na seletividade. 34,41 Nesses sistemas, as moléculas reagentes sofrem transformações químicas para produzir intermediários, que irão se difundir para outros sítios, onde sofrem novos arranjos para formar o produto final que, então, dessorve. Nessas circunstâncias, a seletividade varia acentuadamente com a conversão, como ocorre na reação de Fischer-Tropsch que produz hidrocarbonetos de cadeia longa a partir de monóxido de carbono e hidrogênio.…”

Section: 30unclassified

Nanotecnologia: aspectos gerais e potencial de aplicação em catálise

Ferreira¹,

Rangel²

2009

Quím. Nova

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Recebido em 14/4/08; aceito em 18/2/09; publicado na web em 4/8/09 NANOTECHNOLOGY: GENERAL ASPECTS AND POTENTIAL APPLICATIONS IN CATALYSIS. In recent years nanomaterials, such as metallic nanoparticles, nanowires, nanotapes, nanotubes and nanocomposites, have attracted increasing interest for several technological applications. In catalysis, the great potential of nanomaterials is related to the high catalytic activity exhibited by these materials as a function of the high surface/volume ratio when the particles acquire diameter below 5 nm. In this work, a review about concepts and background of nanoscience and nanotechnology is presented with emphasis in catalysis. Special attention is given to gold nanoparticles and carbon nanotubes, focusing the properties and characteristics of these materials in several catalytic reactions.Keywords: nanocatalysts; gold nanoparticles; carbon nanotubes. INTRODUÇÃOA ciência e tecnologia em nanoescala têm atraído considerável atenção nos últimos anos, pela expectativa do impacto que os materiais nanoestruturados podem causar na melhoria da qualidade de vida e na preservação do meio ambiente. Espera-se que o avanço da nanociência e da nanotecnologia estimule não apenas a exploração de novos fenômenos e novas teorias, mas também conduza a uma revolução industrial, se tornando a nova força motora do crescimento econômico neste século. 1A pesquisa e o desenvolvimento, em nanotecnologia, visam a manipular estruturas em nanoescala e integrá-las para formar componentes e sistemas maiores. As possibilidades são quase infinitas e se prevê que a nanotecnologia exerça um efeito mais profundo, na sociedade do futuro, que o impacto causado pelos automóveis, aviões, televisões e computadores no século XX. Espera-se que muitos dos importantes impactos devam vir do aumento das velocidades das reações, através do uso de nanocatalisadores e da integração da eletrônica molecular com a tecnologia avançada do silício. Espera-se que a nanotecnologia possa proporcionar a geração de novos produtos e novas oportunidades de mercado, através da integração da ciência e tecnologia. A maioria das indústrias atuais irá se beneficiar com as inovações da nanotecnologia. As colaborações e interações entre indústria, academia e instituições governamentais, em escala mundial, irão acelerar o desenvolvimento de novos produtos. O tradicional modelo de negócio de larga escala deverá ser revisto de modo a considerar o elevado valor agregado dos nanomateriais e o valor social deverá incluir um menor impacto ambiental na manufatura dos produtos.5 Os processos deverão ser mais limpos e com maior eficiência no uso da energia e, possivelmente, de novas fontes renováveis. O consumidor irá se beneficiar pela diversidade de produtos baseados na nanotecnologia, que irão melhorar a qualidade de vida das pessoas em todo o mundo.Alguns produtos em nanoescala já estão sendo comercializados, tais como dióxido de titânio, ouro, prata e cobre que, adicionados aos plásticos, tintas e outros materiais, melhoraram o seu desempenho. Ou...

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“…In most cases, researchers have tried to find proper catalyst functions by adding trace amount of some metals such as Sn, In, and Ge to improve the operation and selectivity of the catalyst and reduce the probability of coke formation on the catalyst surface. Studies are performed by Borgna et al,2 Boutzeloit et al,3 Viswanadham et al,4 Mazzieri et al,5 Dippolito et al,6 Pieck et al,7 Benitez et al,8, 9 Le Peltier et al,10 and Carvalho et al11, 12 in this regard. Furthermore, other researchers such as Weifeng et al,13 Ramage et al,14 Marin et al,15 Boyas and Froment,16 Stijepovic et al,17 and Juarez and Macias18 investigated detailed kinetic reactions to detect most of the components in the naphtha blend.…”

Section: Introductionmentioning

confidence: 98%

A novel dynamic membrane reactor concept with radial‐flow pattern for reacting material and axial‐flow pattern for sweeping gas in catalytic naphtha reformers

et al. 2011

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Naphtha reforming units are of high interest for hydrogen production in refineries. In this regard, the application of membrane concept in radial‐flow tubular naphtha reactors for hydrogen production is proposed. Because of the importance of the pressure drop problem in catalytic naphtha reforming units, the radial‐flow reactors are proposed. A radial‐flow tubular membrane reactor (RF‐TMR) with the radial‐flow pattern of the naphtha feed and the axial‐flow pattern of the sweeping gas is proposed as an alternative configuration for conventional axial‐flow tubular reactors (AF‐TR). The cross‐sectional area of the tubular reactor is divided into some subsections in which walls of the gaps between subsections are coated with the Pd‐Ag membrane layer. A dynamic mathematical model considering radial and axial coordinates ((r, z)‐coordinates) has been developed to investigate the performance of the new configuration. Results show ∼300 and 11 kg/h increase in aromatic and hydrogen production rates in RF‐TMR compared with AF‐TR, respectively. Furthermore, smaller catalyst particles with higher efficiency can be used in RF‐TMR due to a slight pressure drop. The enhancement in aromatics (octane number) and hydrogen productions owing to applying simultaneously the membrane concept and radial‐flow pattern in naphtha reactors motivates the application of RF‐TMR in refineries. © 2011 American Institute of Chemical Engineers AIChE J, 2012

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Metal dispersion and catalytic activity of trimetallic Pt-Re-Sn/Al2O3 naphtha reforming catalysts

Cited by 49 publications

References 26 publications

Elucidation of the roles of Re in steam reforming of glycerol over Pt–Re/C catalysts

Elucidation of the roles of Re in steam reforming of glycerol over Pt–Re/C catalysts

Nanotecnologia: aspectos gerais e potencial de aplicação em catálise

A novel dynamic membrane reactor concept with radial‐flow pattern for reacting material and axial‐flow pattern for sweeping gas in catalytic naphtha reformers

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