Comparison of the acidity/site energy distribution in catalytically important zeolites

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90182-6· OSTI ID:6783089

Choudhary, V R; Akolekar, D B ^[1]

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1. National Chemical Laboratory, Pune (India)

The most commonly used zeolites in various catalytic reactions are HY, rare-earth-exchanged X- and Y-type zeolites, H-mordenite (HM), L-type zeolites, and the pentasil high silica (ZSM-5, ZSM-8 and ZSM-11) zeolites. These zeolites differ very widely in their Si/Al ratios and also in their channel structures and diameters. The structural Al (i.e., tetrahedral Al) is responsible for the presence of high-strength acid sites in the zeolites. Because of their different Al contents and structures, zeolites differ widely in their acidity and consequently in their catalytic properties. In the present investigation the acidity (strong acid sites) and acid strength distributions of catalytically important zeolites HY, CeNaY, CeNaX, HKL, HM, H-ZSM-5, H-ZSM-8, and H-ZSM-11 have been compared by measuring step-wise thermal desorption of pyridine from the zeolites using the GC adsorption/desorption technique.

• OSTI ID: 6783089
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 119:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603 -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM
AZINES
CHEMICAL PREPARATION
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
CHEMISORPTION
CHROMATOGRAPHY
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DESORPTION
ELEMENTS
GAS CHROMATOGRAPHY
HETEROCYCLIC COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MICROSTRUCTURE
MINERALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PH VALUE
PYRIDINE
PYRIDINES
QUANTITY RATIO
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
SYNTHESIS
ZEOLITES