Catalysis over porous anodic alumina film catalysts with different pore surface concentrations

Patermarakis, G; Nicolopoulos, N

dc.contributor.author	Patermarakis, G	en
dc.contributor.author	Nicolopoulos, N	en
dc.date.accessioned	2014-03-01T01:14:27Z
dc.date.available	2014-03-01T01:14:27Z
dc.date.issued	1999	en
dc.identifier.issn	0021-9517	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13070
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0001754243&partnerID=40&md5=9271232f36d702c8c4d67122e4695442	en
dc.subject	Catalytic decomposition	en
dc.subject	Designed structure	en
dc.subject	Formic acid	en
dc.subject	Pore surface concentration	en
dc.subject	Porous anodic alumina	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	PT-AL2O3 MODEL CATALYSTS	en
dc.subject.other	ELECTRON-MICROSCOPY	en
dc.subject.other	AL2O3 FILMS	en
dc.subject.other	PLATINUM	en
dc.subject.other	GROWTH	en
dc.title	Catalysis over porous anodic alumina film catalysts with different pore surface concentrations	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	The catalytic behaviour of porous anodic Al2O3 films with different surface concentrations and lengths of pores vertical to the surface was investigated in the HCOOH decomposition test reaction in which they showed an congruent to 100% dehydrative action. The surface density and length of pores and the position on the pore walls were found to affect strongly the kinetic parameters activation energy, preexponential factor, and total and specific activity at each constant reaction temperature, revealing a strong catalytic heterogeneity of the pore wall surface. Anodic aluminas modified by hydrothermal treatment showed a much different catalytic behaviour, a strong reduction of the pore wall surface heterogeneity, and much higher activities than those of nonmodified aluminas. The promotion factor gave a maximum at a pore length specific for each pore surface density, usually increased with reaction temperature and generally varied between congruent to 3 and congruent to 23. Methods to prepare ultra-active aluminas of designed structure are thus predicted. (C) 1999 Academic Press.	en
heal.publisher	ACADEMIC PRESS INC	en
heal.journalName	Journal of Catalysis	en
dc.identifier.isi	ISI:000083521800006	en
dc.identifier.volume	187	en
dc.identifier.issue	2	en
dc.identifier.spage	311	en
dc.identifier.epage	320	en