H2-D2 exchange and migration of Ga in H-ZSM5 and H-MOR zeolites

M. Garcia Sanchez, P.C.M.M. Magusin, E.J.M. Hensen, R.A. Santen, van

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

Trimethylgallium (TMGa) was loaded by chem. vapor deposition (CVD) on two different zeolites, H-ZSM5 and H-MOR. The interaction of TMGa on zeolite acid sites and the effect of redn. and oxidn. treatments were characterized by ICP, XPS, FT-IR and 71Ga NMR. The capacity of dissociatively adsorption of H2 and D2 and the resultant HD desorption was analyzed by H2-D2 exchange reaction. The oxidn. and specially the redn. treatment provoke the migration and redistribution thought zeolite crystals. FT-IR results show that TMGa reacts with both silanol and sterically accessible Bronsted acid sites. 71Ga NMR spectra show that Ga is presents in two different geometries: octahedral and Ga compensating the neg. charged Al from the framework zeolite structure. Hydrogen pretreatment of both zeolites has a pos. effect on the distribution of Ga. However, Ga species obtained were less active for H2-D2 exchange than the Ga species obtained after oxidn.
Original languageEnglish
Title of host publicationImpact of zeolites and other porous materials on the new technologies at the beginning of the new millennium : proceedings of the 2nd International FEZA (Federation of the European Zeolite Associations) conference, Taormina, Italy, September 1 - 5, 2002
EditorsR. Aiello, F. Testo, G. Giordano
Place of PublicationAmsterdam
PublisherElsevier
Pages959-966
ISBN (Print)0-444-51174-1
DOIs
Publication statusPublished - 2002
Eventconference; International FEZA conference ; 2 (Taormina) : 2002.09.01-05; 2002-09-01; 2002-09-05 -
Duration: 1 Sep 20025 Sep 2002

Publication series

NameStudies in Surface Science and Catalysis
Volume142
ISSN (Print)0167-2991

Conference

Conferenceconference; International FEZA conference ; 2 (Taormina) : 2002.09.01-05; 2002-09-01; 2002-09-05
Period1/09/025/09/02
OtherInternational FEZA conference ; 2 (Taormina) : 2002.09.01-05

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