Process and apparatus for measuring gaseous fixed nitrogen speci

Details Process and apparatus for measuring gaseous fixed nitrogen speci Process and apparatus for measuring gaseous fixed nitrogen speci

1981-03-16

1982-06-08

Turk, Arnold

Chemistry: physical processes

Physical processes

Crystallization

23230PC, 23232E, 422 52, 422 78, 422 91, G01N 2175, G01N 3112

Patent

active

043337350

ABSTRACT:
Process and apparatus for measuring total fixed gaseous nitrogen species, including NH.sub.3, NO, NO.sub.2, HCN and organic amines in gaseous mixtures. The process involves catalytic conversion at elevated temperature of all fixed nitrogen species to nitric oxide, NO, followed by chemiluminescent measurement of the resulting NO concentration. The improvement features of the process are the use of a reduced pressure gaseous sample flow to prevent N.sub.2 poisoning of the heated platinum catalyst and a preheat step of the reduced pressure gaseous mixture in an inert, non-catalytic quartz preheater prior to catalytic conversion to prevent loss of some species, such as NH.sub.3, through premature catalyzed reaction with NO and subsequent loss from the system as N.sub.2.

REFERENCES:
patent: 3647387 (1972-03-01), Benson et al.
patent: 3919397 (1975-11-01), Gould
patent: 3996008 (1976-12-01), Fine et al.
patent: 4070155 (1978-01-01), Fraim
EPRI Report No. 223-1 (Mar. 1976) by R. F. Sawyer et al.
ACS Abstract, 173rd ACS Nat'l Meeting, New Orleans, Mar. 20-25, 1977, Environ Chem. Prepr. 17 #1:11-12.
NTIS Publication PB 298248 (Feb., 1974) "Optimized Chemiluminescence System for Measuring Atmospheric Ammonia".

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