Correlation of zeolites Nul and ZSM-5 acid site strength with catalytic activity and selectivity. Final report

Technical Report · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6923082

Hayhurst, D T

The effect of various pretreatments on catalytic properties of medium pore size zeolites, namely Nu-1 and ZSM-5, was determined. A breakdown begins in the as synthesized Nu-1 structure at 520/sup 0/C and the Nu-1 is essentially amorphous by 700/sup 0/C. The acidity of different metal impregnated ZSM-5's were characterized by microgravimetric measurement of ammonia adsorbed onto the acid sites of the zeolite. The isosteric heats of adsorption were measured at very low ammonia coverage. The heat of adsorption of the ZSM-5 sample with no metal was as high as 160KJ mole/sup -1/. The maximum heat of adsorption for the sample impregnated in acetone solution stayed as high as 160KJ mole/sup -1/ and dropped to 120KJ mole/sup -1/ for the sample impregnated in water solution. Also the maximum heat of adsorption for the samples impregnated with cobalt and thorium in acetone and water solution dropped from 170KJ mole/sup -1/ correspondingly to 145KJ mole/sup -1/ and 134KJ mole/sup -1/. Total numbers of acid sites decreased upon metal impregnation. 50 references, 26 figures, 15 tables.

• Research Organization: Cleveland State Univ., OH (USA). Dept. of Chemical Engineering
• DOE Contract Number: AC22-80PC30187
• OSTI ID: 6923082
• Report Number(s): DOE/PC/30187-T1; ON: DE84003147
• Country of Publication: United States
• Language: English

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ACTINIDES
ADSORPTION
ADSORPTION HEAT
AMMONIA
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COBALT
CONVERSION
CORRELATIONS
DATA
ELECTRON MICROSCOPY
ELEMENTS
ENTHALPY
EXPERIMENTAL DATA
GRAVIMETRIC ANALYSIS
HEAT TREATMENTS
HIGH TEMPERATURE
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGENATION
IMPREGNATION
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MICROSCOPY
MINERALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
SCANNING ELECTRON MICROSCOPY
SORPTION
SORPTIVE PROPERTIES
SPECIFICITY
SURFACE PROPERTIES
TEMPERATURE EFFECTS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMIC PROPERTIES
THORIUM
TRANSITION ELEMENTS
ZEOLITES