FLOW-INJECTION THERMAL-ANALYSIS MASS-SPECTROMETRY - APPLICATION TO STUDIES OF CARBON GASIFICATION REACTIONS

Flow injection combined with thermal analysis-mass spectrometry is a u seful technique for studying gasification reactions. It provides a rap id, powerful method of separating the variables of a particular reacti on, such as reactant concentration, reactant composition and temperatu re, studying their influence on the reaction products and differential thermal analysis. The present work illustrates the technique using th e following examples: (1) the reaction of NO with carbon, and (2) the reaction of NH3 and NO over carbon. In both cases, >99% isotopically p ure C-13 was used, so that N-2 and CO, and also N2O and CO2 could be m ass-resolved. The results also illustrate the application of the techn ique to the study of the effect of oxygen concentration and gasificati on temperature on the formation of N2O and N-2 during the NO-carbon re action. The results show that the N2O:N-2 ratio increases with oxygen concentration while the N2O concentration decreases with increasing te mperature. (C) 1997 Elsevier Science Ltd. All rights reserved.