Pilot-scale evaluation of a novel TiO2-supported V2O5 catalyst for DeNOx at low temperatures at a waste incinerator

Abstract

The removal of NOx by catalytic technology at low temperatures is significant for treatment of flue gas in waste incineration plants, especially at temperatures below 200 degrees C. A novel highly active TiO2-supported vanadium oxide catalyst at low temperatures (200-250 degrees C) has been developed for the selective catalytic reduction (SCR) de-NOx process with ammonia. The catalyst was evaluated in a pilot-scale equipment, and the results were compared with those obtained in our previous work using laboratory scale (small volume test) equipment as well as bench-scale laboratory equipment. In the present work, we have performed our experiments in pilot scale equipment using a part of effluent flue gas that was obtained from flue gas cleaning equipment in a full-scale waste incineration plant in South Korea. Based on our previous work, we have prepared a TiO2-supported V2O5 catalyst coated (with a loading of 7 wt% of impregnated V2O5) on a honeycomb cordierite monolith to remove NOx from a waste incinerator flue gas at low temperatures. The NOx (nitrogen oxides) removal efficiency of the SCR catalyst bed was measured in a catalyst fixed-bed reactor (flow rate: 100 m(3) h(-1)) using real exhaust gas from the waste incinerator. The experimental results showed that the V2O5/TiO2 SCR catalyst exhibited good DeNOx performance (over 98% conversion at an operating temperature of 300 degrees C, 95% at 250 degrees C, and 70% at 200 degrees C), and was much better than the performance of commercial SCR catalysts (as low as 55% conversion at 250 degrees C) under the same operating conditions. (C) 2016 Elsevier Ltd. All rights reserved.