Proton-loaded zeolites. 2. Dehydrohalogenation versus decationization kinetics: Cation and acidity effects

Journal Article · Thu Oct 18 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100384a054· OSTI ID:6050672

Ozin, G A; Oezkar, S; McMurray, L ^[1]

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1. Univ. of Toronto, Ontario (Canada)

The work presented in part 1 of this study established that the sorption of anhydrous HX into dehydrated Na{sub 56}Y progresses through a sequence of steps involving HX ionization and charge separation, oxygen framework protonation, formation of {alpha}-cage confined cation-anion contact ion pairs, and proton solvation by HX. A logical extension, which is the subjected of this study, concerns the effect of extraframework alkali metal cation type (M = Li{sup +}, Na{sup +}, K{sup +}, Rb{sup +}, Cs{sup +}) on the sorption process. The question of the acidity of proton-loaded zeolites compared to Broensted acid zeolites is addressed by using probe reactions with weak bases like ethane and cyclopropane. Additional insight into these systems is also obtained from a quantitative comparison of the kinetic and thermodynamic activation parameters for the dehydrohalogenation of proton-loaded zeolites exemplified by (HX){sub 8}Na{sub 56}Y relative to the decationization (dehydroxylation) of Broensted acid zeolites represented by H{sub 8}Na{sub 48}Y.

• OSTI ID: 6050672
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:21; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METALS
ALKANES
BROENSTED ACIDS
CALCULATION METHODS
CHEMICAL REACTION KINETICS
ELEMENTS
ETHANE
HYDROCARBONS
HYDROGEN COMPOUNDS
INFRARED SPECTRA
INORGANIC ACIDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
METALS
MINERALS
ORGANIC COMPOUNDS
PH VALUE
REACTION KINETICS
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
ZEOLITES