Size, shape, and site selectivities in the photochemical reactions of molecules adsorbed on pentasil zeolites. Effects of coadsorbed water

Journal Article · Wed Apr 15 04:00:00 EDT 1987 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00242a033· OSTI ID:6629334

Turro, N J; Cheng, C; Abrams, L; Corbin, D R

The photochemistry of methylbenzyl benzyl ketones (ACOB) in the presence of pentasil zeolites follows strikingly different pathways due to the location of the adsorbed ketone. The product distribution, in terms of the cage effect (efficiency of germinate radical combination), demonstrates the effects of sorption and diffusion on the radical species produced by photolysis. p-ACOB is readily adsorbed within the pentasil framework and produces p-AB as the primary product. In contrast, the photolysis product distributions of o-ACOB can be dramatically varied depending upon the extent of its adsorption into the framework. By addition of a nonreactive titrant, such as water, after the ketone adsorption, the photolysis product distributions can be systematically varied depending upon the aluminum content of the framework. The observed results are completely described by considerations of (a) the size and shape sorption of the pentasil zeolites, (b) the sorption of water by the hydrophilic sites of the pentasil zeolites (which depend upon the framework aluminum content), and (c) the hydrophobic characteristics of the pentasil channels which do not contain framework aluminum.

• Research Organization: Columbia Univ., New York, NY
• OSTI ID: 6629334
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 109:8; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ADSORPTION
ALUMINIUM
AROMATICS
CATALYSTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
DIFFUSION
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KETONES
MATERIALS
METALS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOLYSIS
RADICALS
SHAPE
SIZE
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
WATER
ZEOLITES