Diffusion in fluid catalytic cracking catalysts on various displacement scales and its role in catalytic performance

Kortunov, P; Vasenkov, S; Karger, J; Fe Elia, M; Perez, M; Stocker, M; Papadopoulos, GK; Theodorou, D; Drescher, B; McElhiney, G; Bernauer, B; Krystl, V; Kocirik, M; Zikanova, A; Jirglova, H; Berger, C; Glaser, R; Weitkamp, J; Hansen, EW

dc.contributor.author	Kortunov, P	en
dc.contributor.author	Vasenkov, S	en
dc.contributor.author	Karger, J	en
dc.contributor.author	Fe Elia, M	en
dc.contributor.author	Perez, M	en
dc.contributor.author	Stocker, M	en
dc.contributor.author	Papadopoulos, GK	en
dc.contributor.author	Theodorou, D	en
dc.contributor.author	Drescher, B	en
dc.contributor.author	McElhiney, G	en
dc.contributor.author	Bernauer, B	en
dc.contributor.author	Krystl, V	en
dc.contributor.author	Kocirik, M	en
dc.contributor.author	Zikanova, A	en
dc.contributor.author	Jirglova, H	en
dc.contributor.author	Berger, C	en
dc.contributor.author	Glaser, R	en
dc.contributor.author	Weitkamp, J	en
dc.contributor.author	Hansen, EW	en
dc.date.accessioned	2014-03-01T01:22:11Z
dc.date.available	2014-03-01T01:22:11Z
dc.date.issued	2005	en
dc.identifier.issn	0897-4756	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16481
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Activation energy	en
dc.subject.other	Adsorption	en
dc.subject.other	Aromatic hydrocarbons	en
dc.subject.other	Crystal structure	en
dc.subject.other	Diffusion	en
dc.subject.other	Fluid catalytic cracking	en
dc.subject.other	Freezing	en
dc.subject.other	Nuclear magnetic resonance	en
dc.subject.other	Porous materials	en
dc.subject.other	Zeolites	en
dc.subject.other	Diffusion in fluids	en
dc.subject.other	Diffusivity	en
dc.subject.other	Fluid catalytic cracking (FCC)	en
dc.subject.other	Pulsed field gradient (PFG) nuclear magnetic resonance (NMR)	en
dc.subject.other	Catalysts	en
dc.title	Diffusion in fluid catalytic cracking catalysts on various displacement scales and its role in catalytic performance	en
heal.type	journalArticle	en
heal.identifier.primary	10.1021/cm050031z	en
heal.identifier.secondary	http://dx.doi.org/10.1021/cm050031z	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	Diffusivities of n-octane in particles of industrial fluid catalytic cracking (FCC) catalysts and in zeolite USY, which is the main zeolitic component of the particles, are reported. Diffusion measurements have been performed by using pulsed field gradient (PEG) NMR for a broad range of molecular displacements and temperatures. The recorded diffusivities are used to evaluate the relevance of various transport modes in the particles of FCC catalysts, such as diffusion in the micropores of the zeolite crystals located in the particles, diffusion through the surface layer of these crystals, and diffusion in the meso- and macropores of the particles, for the rate of molecular exchange between catalyst particles and the surrounding atmosphere. This rate is shown to be primarily related to the diffusion in the meso- and macropores of the particles under the condition of fast molecular exchange between these pores and the zeolite crystals located in the particles. The diffusivity associated with this type of diffusion (i.e., the intraparticle diffusivity) is found to correlate well with the catalytic performance of FCC catalysts having the same fractions of the same zeolite USY but different systems of meso- and macropores. © 2005 American Chemical Society.	en
heal.publisher	AMER CHEMICAL SOC	en
heal.journalName	Chemistry of Materials	en
dc.identifier.doi	10.1021/cm050031z	en
dc.identifier.isi	ISI:000228760300035	en
dc.identifier.volume	17	en
dc.identifier.issue	9	en
dc.identifier.spage	2466	en
dc.identifier.epage	2474	en