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The parallel dehydrative and dehydrogenative catalytic action of γ-Al2O3 pure and doped by MgO: Kinetics, selectivity, time dependence of catalytic behaviour, mechanisms and interpretations

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dc.contributor.author Patermarakis, G en
dc.date.accessioned 2014-03-01T01:19:37Z
dc.date.available 2014-03-01T01:19:37Z
dc.date.issued 2003 en
dc.identifier.issn 0926860X en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/15615
dc.subject γ-Al2O3 + (0 and 1% MgO) en
dc.subject Dehydration en
dc.subject Dehydrogenation en
dc.subject Formic acid decomposition en
dc.subject Mechanisms en
dc.subject Reactions kinetics en
dc.subject Selectivity en
dc.subject Temperature dependence of ageing and activation en
dc.subject.other Activation energy en
dc.subject.other Catalysis en
dc.subject.other Doping (additives) en
dc.subject.other Magnesia en
dc.subject.other Positive ions en
dc.subject.other Reaction kinetics en
dc.subject.other Dehydrogentaion en
dc.subject.other Alumina en
dc.title The parallel dehydrative and dehydrogenative catalytic action of γ-Al2O3 pure and doped by MgO: Kinetics, selectivity, time dependence of catalytic behaviour, mechanisms and interpretations en
heal.type journalArticle en
heal.identifier.primary 10.1016/S0926-860X(03)00411-3 en
heal.identifier.secondary http://dx.doi.org/10.1016/S0926-860X(03)00411-3 en
heal.publicationDate 2003 en
heal.abstract The catalytic test reaction of HCOOH decomposition on pure γ-Al 2O3 and doped (+ MgO (1% w/w)) was studied at temperatures 275-400°C. A double dehydrative and dehydrogenative, instead the thought single dehydrative, behaviour of γ-Al2O 3 was disclosed. The dehydration activity is higher for pure alumina and decreases with operation time while the dehydrogenation activity is higher for doped and increases with time at the higher but decreases at the lower temperatures showing an unusual temperature dependent activation and ageing. Doping and increase of temperature reduce dehydration selectivity. It decreases with operation time at higher but increases at lower temperatures. The Arrhenius kinetic parameters of reactions differ strongly. Activation energy of dehydration seems unaffected and pre-exponential factor slightly affected by catalyst kind and operation time. Parameters concerning dehydrogenation are affected slightly by catalyst kind and strongly by operation time. Based on an atomic scale structure analysis and results, two dehydration and one dehydrogenation coexisting mechanisms stemming from identical initial step of dissociative adsorption of HCOOH as H+ and HCOO- were suggested interpreting the results. The observed behaviour is due to changes of surface atomic spacing by doping Mg2+ and of mean distances of adsorptive pair sites with operation time caused by the second mechanism. © 2003 Elsevier B.V. All rights reserved. en
heal.journalName Applied Catalysis A: General en
dc.identifier.doi 10.1016/S0926-860X(03)00411-3 en
dc.identifier.volume 252 en
dc.identifier.issue 2 en
dc.identifier.spage 231 en
dc.identifier.epage 241 en


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