Catalysts for NO/sub x/ reduction using ammonia
In the present work, two basically different catalyst compositions were studied. The first was a commercial catalyst, Harshaw V0301, approximately 10% vanadia supported on alumina; the second was a modified molecular-sieve catalyst prepared in our laboratories. The basic design employed for minimizing the pressure drop was that of a parallel-passage reactor, PPR, comprising a set of stainless-steel screens coated on both sides with catalyst particles and mounted in parallel on a steel-rod frame with spaces between them for passage of the gas flowing parallel to the screens. Of the three catalyst compositions tested, Harshaw V0301 was somewhat more active than the modified molecular sieve, MS I, but the improved modification, MS II, showed greater activity than the Harshaw catalyst. The NO/sub x/ conversion obtained with the modified molecular-sieve catalysts increases as reaction temperature increases, at least up to somewhere over 450/sup 0/ C. Preliminary design calculations and cost estimates for full-scale PPR units to control NO/sub x/ emissions from utility power plants indicate that this approach holds much promise for obtaining high NO/sub x/ conversions at high space velocities with low pressure drops, and also with attractively low capital investment and operating costs. 4 references, 8 figures, 1 table. (JMT)
- Research Organization:
- Univ. of Massachusetts, Amherst
- OSTI ID:
- 5249379
- Journal Information:
- Environ. Prog.; (United States), Vol. 1:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NITROGEN OXIDES
AIR POLLUTION CONTROL
REDUCTION
CATALYSTS
ALUMINIUM OXIDES
AMMONIA
BOILERS
CHEMICAL REACTIONS
ECONOMICS
EXHAUST GASES
GASEOUS WASTES
MOLECULAR SIEVES
PARTICLE SIZE
RETROFITTING
STACKS
VANADIUM OXIDES
ADSORBENTS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CONTROL
FLUIDS
GASES
HYDRIDES
HYDROGEN COMPOUNDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
SIZE
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
WASTES
424000* - Engineering- Pollution Control Equipment- (1980-1989)