Investigation of low-pressure flames of a number of compounds containing sulfur by the ESR method

Role of toluene to acid gas (H2S and CO2) combustion in H2/O2–N2 flame under Claus condition

“…Their results further revealed that oxygen enrichment to combustion air increases the oxidizing role of CO 2 , which enhanced the formation of SO 2 , reduced CS 2 while enhancing COS formation due to increased formation of CO in the reactor at higher temperatures. However, their examination of sulfur chemistry in both H 2 S/O 2 and H 2 /Air flames under Claus condition consistently showed inhibition of H 2 oxidation by H 2 S. This finding agrees with those reported by Bernez-Cambot et al [18], Azatyan et al [19], and Pierucci et al [20]. Bernez-Cambot et al studied experimentally the flame structure of H 2 S/air diffusion flame under Claus condition.…”

“…The third zone is characterized by partial consumption of H 2 . Similarly, Azatyan et al [19] examined the behavior of H 2 S, CS 2 and COS combustion at low-pressure. They coupled ''electron spin resonance'' technique along with gas chromatography, and reported that H 2 S oxidation takes place in stages.…”

Effect of oxygen enrichment on acid gas combustion in hydrogen/air flames under claus conditions

“…This is attributed to the increase in temperature. Reactions (1)-(5) describe H 2 S oxidation [9,10].…”

“…This supports the hypothesis that additional amount of hydrogen is formed from hydrogen sulfide oxidation which could be significant at higher temperatures. And lastly, hydrogen sulfide is considered an inhibitor for hydrogen oxidation [9,10].…”

“…With the help of the aforementioned radical measurements they were able to provide kinetics parameters for various possible intermediate chemical reactions of sulfur compounds. Azatyan et al [9] examined the behavior of hydrogen sulfide, carbon disulfide, and carbonyl sulfide combustion at low-pressure using electron spin resonance technique along with gas chromatography. Their results revealed that first stage of H 2 S formation includes the formation of H 2 , SO 2 and SO and they suggested that the presence of H 2 S is considered inhibitor of H 2 oxidation.…”