Dealuminated H-Y zeolites: Relation between physicochemical properties and catalytic activity in heptane and decane isomerization
作者： M. J. Remy , D. Stanica , G. Poncelet , E. J. P. Feijen , P. J. Grobet
DOI: 10.1021/JP953006X
关键词: Isomerization 、 Adsorption 、 Decane 、 Chemistry 、 Octahedron 、 Catalysis 、 Heptane 、 Physical chemistry 、 Inorganic chemistry 、 X-ray photoelectron spectroscopy 、 Zeolite
摘要: The acidity of a series commercial dt aluminated H-Y zeolites was studied by means MAS NMR and XPS spectroscopy. Al-27 has shown the presence three types Al in dealuminated samples: framework tetrahedral Al, nonframework octahedral third type Al. As inferred from Si/Al ratio obtained Si-29 spectra evolution the. unit cell parameter determined XRD, this may be localized into zeolite framework. characterization samples their acid form allowed us to establish relative concentration at outer surface particles. Upon adsorption ammonia on zeolites, sites have been evidenced XPS. analysis data indicates that strength associated with atoms is not influenced other catalytic results heptane decane hydroisomerization certain very efficient. information provided NMR, combined literature data, partially elucidate origin high activity some zeolites.
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