Influence of pretreatment methods on adsorption and catalytic characteristics of toluene over heterogeneous palladium based catalysts

WANG GEUN, SHIM ; SANG CHAI, KIM ; et al.

In: Six international symposium: Effects of surface heterogeneity in adsorption and catalysis on solids-ISSHAC-VI, Zakopane, Poland, 28th August-2nd September 2006Applied surface science 253(13):5868-5875; Jg. 253 (2007) 13, S. 5868-5875

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The adsorption and catalytic characteristics of heterogeneous palladium based catalyst and its modified catalysts with gases (air and hydrogen) and acidic aqueous solution (HCl) were studied for evaluating the influence of pretreatment methods for toluene. The structural and energetic adsorption properties of the parent and pretreated catalysts were analyzed by means of nitrogen adsorption isotherms and gravimetric methods. The light-off curve and the XPS investigation were used for analyzing the catalytic activity and the surface state of palladium. It was clearly shown from the experimental results that hydrogen pretreated catalysts having metallic surface state exhibited the highest adsorption capacity and catalytic activity compared to that of parent and modified catalysts. The adsorption equilibrium data for toluene were obtained at three different temperatures and correlated successfully with the two-site Langmuir molecular isotherm model (L2m). It was also found that the palladium phase has more adsorption affinity for toluene molecules than the alumina support. The isosteric heat of adsorption calculated by using the Clausius-Clapeyron equation significantly changed with the coverage and the lateral interactions between the adsorbate-adsorbate molecules control the system. Furthermore, comparative analysis of the adsorption energy distribution revealed that the parent and its modified catalysts have different types of surface energetic heterogeneities.

Titel:	Influence of pretreatment methods on adsorption and catalytic characteristics of toluene over heterogeneous palladium based catalysts
Autor/in / Beteiligte Person:	WANG GEUN, SHIM ; SANG CHAI, KIM ; HYUN CHUL, KANG ; SEUNG WON, NAHM ; JAE WOOK, LEE ; MOON, Hee
Link:	E-Journal im Bestand der UB Hagen? View record from PASCAL Archive
Quelle:	Six international symposium: Effects of surface heterogeneity in adsorption and catalysis on solids-ISSHAC-VI, Zakopane, Poland, 28th August-2nd September 2006Applied surface science 253(13):5868-5875; Jg. 253 (2007) 13, S. 5868-5875
Veröffentlichung:	Amsterdam: Elsevier Science, 2007
Medientyp:	Konferenz
Umfang:	print, 16 ref
ISSN:	0169-4332 (print)
Schlagwort:	General chemistry, physical chemistry Chimie générale, chimie physique Crystallography Cristallographie cristallogenèse Nanotechnologies, nanostructures, nanoobjects Nanotechnologies, nanostructures, nanoobjets Condensed state physics Physique de l'état condensé Sciences exactes et technologie Exact sciences and technology Physique Physics Etat condense: structure, proprietes mecaniques et thermiques Condensed matter: structure, mechanical and thermal properties Surfaces et interfaces; couches minces et trichites (structure et propriétés non électroniques) Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Surfaces solides et interfaces solide-solide Solid surfaces and solid-solid interfaces Chimie Chemistry Chimie generale et chimie physique General and physical chemistry Théorie des réactions, cinétique générale. Catalyse. Nomenclature, documentation chimique, informatique chimique Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Catalyse Catalysis Catalyseurs: préparations et propriétés Catalysts: preparations and properties Catalyseur Catalyst Catalizador Composé organique volatil Volatile organic compound Compuesto orgánico volátil Isotherme adsorption Adsorption isotherm Isotermo adsorción Oxydation Oxidation Oxidación Palladium Paladio Prétraitement Pretreatment Pretratamiento Toluène Toluene Tolueno Pd Adsorption Catalytic oxidation VOCs
Sonstiges:	Nachgewiesen in: PASCAL Archive Sprachen: English Original Material: INIST-CNRS Document Type: Conference Paper File Description: text Language: English Author Affiliations: Faculty of Applied Chemical Engineering and Center for Functional Nano Fine Chemicals (BK21 CFN), Chonnam National University, Gwangju 500-757, Korea, Republic of ; Department of Environmental Education, Mokpo National University, #61 Dorim-ri, Chungkye-myon, Muan 534-729, Korea, Republic of ; Department of Chemical Engineering, Seonam University, Namwon 590-170, Korea, Republic of Rights: Copyright 2007 INIST-CNRS ; CC BY 4.0 ; Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS Notes: General chemistry and physical chemistry ; Physics of condensed state: structure, mechanical and thermal properties

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