borderline catalyst

13:18 Nov 12, 2008
This question was closed without grading. Reason: Answer found elsewhere

English to Spanish translations [PRO]
Tech/Engineering - Automotive / Cars & Trucks
English term or phrase: borderline catalyst
No logro encontrar el termino exacto, tampoco encuentro definiciones como para intentar aproximarme un poco más al término. Sin duda estamos hablando de un catalizador, pero me desconcierta el "borderline".

(En un gráfico con notas sobre el sistema de monitoreo de catalizador)
"Simulation of **borderline catalyst** and downstream oxygen sensor calculation mount **borderline catalyst** on vehicle and real time samples engine running datas (A/F ratio, load), to attain the signal of downstream oxygen sensor and establish evaluation model signal. "
Thanks !! :)
Melina Ruiz Arias
Local time: 15:46

Summary of answers provided
4"Catalizador sobre soporte"
Summary of reference entries provided
casi definición
P Forgas
Teresa Mozo

Discussion entries: 1



4 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
"Catalizador sobre soporte"

Three Au/TiO2 catalysts, with the same Au loading and with different particle sizes, were prepared by the deposition-precipitation method followed by calcination at three different temperatures, 473, 573, and 873 K. The mean diameters of Au particles were 2.4, 2.5, and 10.6 nm, respectively. On all the samples the CO adsorption and different CO-O2 interactions were examined by FTIR at 90 K and at room temperature. The higher catalytic activity on CO oxidation found for the samples calcined at 473 and 573 K is related to the higher concentration of step sites over the Au surfaces and to a higher concentration of step sites at the borderline with the support. At 90 K, CO and molecular oxygen are competitively adsorbed on step sites. By CO preadsorption on hydrated catalysts, the reaction with O2 gives CO2 already at 90 K, while by oxygen preadsorption the reaction is completely inhibited, unless moisture is present in the gas phase. An effect of CO coadsorption has been evidenced on water dissociation on gold sites or at the interface with the support, producing atomic hydrogen. The hydrogen reacts with the oxygen, producing a reactive species, quickly dissociated in nascent oxygen and OH groups. Moreover, the reaction with 18O2 at 90 K in the presence of moisture produces only C16O18O, giving evidence that there is no direct participation of oxygens of the support and of the water in the reaction. At room temperature, other reaction channels become operative, involving oxygen species activated on the support, as shown by the extensive exchange reactions occurring with the support oxygen.
Revue / Journal Title
Journal of catalysis ISSN 0021-9517 CODEN JCTLA5
Source / Source
2001, vol. 202, no2, pp. 256-267 (30 ref.)
Langue / Language

Editeur / Publisher
Elsevier, Amsterdam, PAYS-BAS (1962) (Revue)

Mots-clés anglais / English Keywords
Transmission electron microscopy ; Infrared spectrometry ; Experimental study ; Supported catalyst ; Gold ; Titanium Oxides ; Preparation ; Calcining ; Catalytic reaction ; Oxidation ; Carbon monoxide ; Gas solid adsorption ; Active site ; Particle size distribution ; Temperature effect ; Heterogeneous catalysis ; Transition metal ;
Mots-clés français / French Keywords
Microscopie électronique transmission ; Spectrométrie IR ; Etude expérimentale ; Catalyseur sur support ; Or ; Titane Oxyde ; Préparation ; Calcination ; Réaction catalytique ; Oxydation ; Carbone monoxyde ; Adsorption gaz solide ; Site actif ; Distribution dimension particule ; Effet température ; Catalyse hétérogène ; Nanoparticule ; Métal transition ;
Mots-clés espagnols / Spanish Keywords
Microscopía electrónica transmisión ; Espectrometría IR ; Estudio experimental ; Catalizador sobre soporte ; Oro ; Titanio Óxido ; Preparación ; Calcinación ; Reacción catalítica ; Oxidación ; Carbono monóxido ; Adsorción gas sólido ; Lugar activo ; Distribución dimensión partícula ; Efecto temperatura ; Catálisis heterogénea ; Metal transición ;

Note added at 4 hrs (2008-11-12 18:14:55 GMT)

Three Au/TiO 2  catalysts, with the same Au loading and with different ... Catalyseur sur support; Supported catalyst; Catalizador sobre soporte; Or; ... - Páginas similares
de F BOCCUZZI - 2001 - Citado por 129 - Artículos relacionados - Las 5 versiones

Local time: 13:46
Specializes in field
Native speaker of: Native in EnglishEnglish, Native in SpanishSpanish
PRO pts in category: 474
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Reference comments

56 mins peer agreement (net): +1
Reference: casi definición

Reference information:
The reference value for the exhaust gas temperature
applies for a borderline catalyst, which is right at the transition
between an acceptable catalyst and a catalyst which is to be considered

P Forgas
Specializes in field
Native speaker of: Spanish
PRO pts in category: 111

Peer comments on this reference comment (and responses from the reference poster)
agree  slothm: Razonable.
29 mins
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6 hrs

Reference information:
es un catalizador que está entre dos cosas, pero no sé cómo pega la referencia de P. Forgas con estas otras:

Polymeric Materials Encyclopedia - Resultado de la Búsqueda de libros de Googlede Joseph C. Salamone - 1996 - Technology & Engineering - 9600 páginas
... active site behavior, these complex trinuclear alkoxides can be viewed as borderline catalysts between their homogeneous and heterogeneous counterparts. ...

Rare-earth metal mixed chloro/methyl compounds: he...[Angew Chem ... - [ Traducir esta página ]Rare-earth metal mixed chloro/methyl compounds: heterogeneous-homogeneous borderline catalysts in 1,3-diene polymerization. ...

Teresa Mozo
Native speaker of: Native in SpanishSpanish
PRO pts in category: 32
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