{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T15:57:06Z","timestamp":1759939026316,"version":"3.41.0"},"reference-count":22,"publisher":"Canadian Science Publishing","issue":"6-7","license":[{"start":{"date-parts":[[2005,6,1]],"date-time":"2005-06-01T00:00:00Z","timestamp":1117584000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Can. J. Chem."],"published-print":{"date-parts":[[2005,6,1]]},"abstract":"<jats:p> <jats:sup>71<\/jats:sup>Ga, <jats:sup>27<\/jats:sup>Al, and <jats:sup>29<\/jats:sup>Si MAS NMR and DRIFT spectroscopies were used to characterize the state of gallium in Ga\/H-ZSM5 catalysts tested for their ability to catalyse the ammoxidation of propane. Ga species were observed in two different possible environments: octahedrally coordinated gallium in small Ga<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> particles at the external surface of the zeolite crystals, octahedrally coordinated gallium in GaO(OH) or related species, and tetrahedrally coordinated gallium in cationic-exchange positions inside the zeolite. Redox (H<jats:sub>2<\/jats:sub>\u0096O<jats:sub>2<\/jats:sub>) cycles promote the migration of gallium from the GaO(OH) or Ga<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> species at the external surface of the zeolite crystals to cationic-exchange sites within the zeolite channels. The redox treatment definitely had a beneficial effect on its catalytic performance for the ammoxidation of propane, which is known to occur via a bifunctional mechanism. The main product was acetonitrile at high Ga and Al contents while acrylonitrile was also observed as a side product at high Ga and low Al contents.Key words: ZSM5, MFI, in situ studies, MAS NMR, DRIFT, propane activation, ammoxidation. <\/jats:p>","DOI":"10.1139\/v05-073","type":"journal-article","created":{"date-parts":[[2005,9,7]],"date-time":"2005-09-07T20:24:15Z","timestamp":1126124655000},"page":"574-580","source":"Crossref","is-referenced-by-count":8,"title":["A MAS NMR and DRIFT study of the Ga species in Ga\/H-ZSM5 catalysts and their effect on propane ammoxidation"],"prefix":"10.1139","volume":"83","author":[{"given":"Prem","family":"Pal","sequence":"first","affiliation":[]},{"given":"Juliette","family":"Quartararo","sequence":"additional","affiliation":[]},{"given":"Sharifah B","family":"Abd Hamid","sequence":"additional","affiliation":[]},{"given":"Eric G","family":"Derouane","sequence":"additional","affiliation":[]},{"given":"Jacques C","family":"V\u00e9drine","sequence":"additional","affiliation":[]},{"given":"Pieter CMM","family":"Magusin","sequence":"additional","affiliation":[]},{"given":"Bruce G","family":"Anderson","sequence":"additional","affiliation":[]}],"member":"155","reference":[{"volume":"4","journal-title":"J. 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