Removal of NOx by microwave reactor with ammonium bicarbonate and Ga-A zeolites at low temperature

• Published in: Energy (Oxford) Vol. 32; no. 8; pp. 1455 - 1459
• Main Authors: WEI, Z. S, DU, Z. Y, LIN, Z. H, HE, H. M, QIU, R. L
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Science 01.08.2007
• Subjects: Air pollution caused by fuel industries; Applied sciences; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Pollution reduction; Nitrogen oxide; Air pollution control; Denitrification; Microwave; Zeolite; Ammonium Hydrogencarbonates; Molecular sieve; Low temperature
• ISSN: 0360-5442
• DOI: 10.1016/j.energy.2006.11.007

Microwave reactor with the mixture of ammonium bicarbonate (NH4HCO3) and Ga-A zeolites was set up to study the removal of nitrogen oxides (NOx) from waste gas with excess oxygen concentration (14-19%) at low temperature (80-120°C). The results showed that the microwave reactor filled with NH4HCO3 and Ga-A zeolites could reduce NOx to nitrogen with the best purifying efficiency of 95.45% and the best denitrification amount of 89.28mgh-1. The optimal microwave power and residence time (RT) on denitrification was 259-280W and 0.259s, respectively. Microwave denitrification effect of the experiment using ammonium bicarbonate and Ga-A zeolites was much higher than that using ammonium bicarbonate or Ga-A zeolites only. The mechanism for microwave-induced NOx reduction can be explained as the microwave-induced catalytic reaction between NOx and ammonium bicarbonate with Ga-A zeolites being the catalyst and microwave absorbent.