Acidity and sorbate shape selectivity of H-ZSM-22, H-ZSM-48, and H-ZSM-50 zeolites

Journal Article · Wed May 01 04:00:00 EDT 1991 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90032-Y· OSTI ID:5530350

Choudhary, V R; Singh, A P; Kumar, R ^[1]

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1. National Chemical Lab., Pune (India)

ZSM-22, ZSM-48, and ZSM-50 zeolites have unidimensional channels, formed by 10-membered rings, having pore dimensions 0.45 {times} 0.55 nm, 0.53 {times} 0.56 nm, and 0.41 {times} 0.58 nm, respectively. These zeolites belong to the class of medium-pore zeolites. The pores of ZSM-48 are near circular, whereas those of the other two zeolites are elliptical. The channels of ZSM-22 and -48 zeolites are linear and have uniform cross sections. However, the zeolite ZSM-50 has side pockets (0.58 {times} 0.68 nm in cross section and 0.81 nm deep) to the channels (4). Since these zeolites differ from each other in their channel structure, it is interesting to know the shape selectivity of these zeolites in sorption for sorbates/reactants of different critical sizes and configurations and also their acid-strength distribution. The present investigation was undertaken for obtaining information on the above. Sorbates used were: m-xylene, o-xylene, 1,2,4-TMB, isopropylbenzene, 2,2-DMB, 2,3-DMB, and isooctane.

• OSTI ID: 5530350
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 129:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKANES
ALKYLATED AROMATICS
AROMATICS
AZINES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMISORPTION
CHROMATOGRAPHY
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
ELEMENTS
FLUIDS
GAS CHROMATOGRAPHY
GASES
HEAT TREATMENTS
HELIUM
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
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MICROSTRUCTURE
MINERALS
NONMETALS
OCTANE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
POROSITY
PYRIDINE
PYRIDINES
RARE GASES
SEPARATION PROCESSES
SHAPE
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SYNTHESIS
XYLENES
ZEOLITES