Acridine char

Figure 1. Retention of Acridine Char Nitrogen as a Function of Burnoff in Air at 773 K...

Mass Fraction of N Released from Acridine Char as a... 

The dramatic decrease in char nitrogen to N0X conversion for the acridine char cannot be attributed only to a 50 K increase in temperature. The char ignited at 873 K but not at 823 K. The bed temperature during oxidation at 873 K was probably considerably higher than 873 K. The bed temperature during oxidation of the phenanthridine char at the furnace temperature of 873 K is shown in Figure 9. A maximum temperature of 1006 K was reached within 3 minutes and the bed temperature remained 50 K higher than the furnace temperature even after 30 minutes. 

Figure 11. Effect of Acridine Char Sample Weignt on Conversion of Char N to NOx during Oxidation in Air at 873 K...

The proportion of the liberated nitrogen which was converted to N0X was also lower for the phenanthridine than the acridine char. It is believed that the balance of nitrogen is released as N2 due to the reduction of N0X by C and/or CO. A high concentration of carbon... 

See also Acid precipitation Acidic gases, collection from coal-fired power plants, 84-91 Acridine, nitrogen contents, 305 Acridine char... 

Acridine char nitrogen, retention as function of burnoff, 307/, 308/ Advection fluxes, calculation, 41-43 Aerosol particle size distribution, molecular clusters, 317 Aerosol scavenging pathway, acetic and formic acid formation, 223 Aerosol species, transformation over the western Atlantic, 52 Aerosol sulfate airborne determination, 298 See also Sulfate... 

The oxidation of chars prepared from nitrogen-containing precursors has been investigated. Chars produced from the nitrogen-containing compounds acridine and phenanthridine were oxidized at atmospheric pressure at temperatures of 773-873 K. The relative rates of nitrogen and carbon release and the formation of NO have been determined in relation to char nitrogen content and precursor type. 

At 773 K, carbon and nitrogen oxidation rates were different for both the acridine and phenanthridine chars, Figures 1 and 2. For... 

Effect of Temperature on Conversion of Char Nitrogen to N0X. The ef-fect of oxidation temperature upon the proportional release of N0X is tabulated in Table II for pure acridine and phenanthridine chars at... 

Figure 10. Conversion of Char N to N0X as a Function of Char N Content for a Range of Acridine and Phenanthridine-Based Chars...

It was also found that the conversion of released nitrogen to N0X decreased with increasing reaction temperature, increasing char nitrogen content (for both acridine and phenanthridine-based chars) and with increasing sample weight (bed height). 

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