Catalytic activity of zirconium phosphate and some derived phases in the dehydration of alcohols and isomerization of butenes
The catalytic activity of ..cap alpha..-Zr(HPO/sub 4/)/sub 2/ x H/sub 2/O prepared by different methods and of phases derived from it by heating between 200 and 1100/sup 0/C or by ion exchange with Na/sup +/, Cs/sup +/, or Ag/sup +/, has been investigated by means of different acid-catalyzed test reactions, namely, isopropanol, 1- or 2-butanol dehydration, and 1-butene isomerization. The active centers of both Zr(HPO/sub 4/)/sub 2/ and ZrP/sub 2/O/sub 7/ phases are mainly the surface Broensted sites, as indicated by the strong decrease or annihilation of their catalytic activity after surface Cs/sup +/ poisoning. An explanation of the low residual activity detected for same samples is given. As deduced from the products of 1-butene isomerization, the acidic sites are generally of medium strength. However, on heating between 350 and 700/sup 0/C, when partial or total condensation of hydrogen phosphate to P-O-P groups occurs (with progressive formation of the layered pyrophosphate phase) they transform into sites of medium-high strength.
- Research Organization:
- Universita di Roma, Italy
- OSTI ID:
- 5533719
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 103:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400 -- Petroleum-- Processing
090221* -- Alcohol Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ALCOHOLS
ALKALI METALS
ALKENES
BUTANOLS
BUTENES
CATALYTIC EFFECTS
CESIUM
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DEHYDRATION
ELEMENTS
HEAT TREATMENTS
HYDROCARBONS
HYDROXY COMPOUNDS
ION EXCHANGE
ISOMERIZATION
KINETICS
METALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POISONING
PROPANOLS
PYROPHOSPHATES
REACTION KINETICS
SILVER
SODIUM
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZIRCONIUM COMPOUNDS
ZIRCONIUM PHOSPHATES