A novel integrated rotary reactor for NOx reduction by CO and air
preheating: NOx removal performance and mechanism
Abstract
A novel integrated rotary reactor for NOx reduction by CO and air
preheating (iNA reactor) was proposed. NOx removal performance was
investigated in a fixed-bed reactor, which was used to simulate the
working conditions change in iNA reactor. Lab-synthesized Cu/FeCeOx were
used as catalyst. Two different modes were tested with iNA reactor:
short cycles and long cycles. Excellent NOx removal efficiencies of over
95% and 90% for short cycles and long cycles were observed in iNA
reactor. Moreover, compared with the constant-temperature rotary
reactor, better H2O and SO2 resistances were also found in iNA reactor.
The reaction mechanism was proposed based on in-situ DRIFT study. NOx
was stored as nitrates in the adsorption zone, and then decomposed
rapidly by both high temperatures and CO, leading to the deep catalyst
regeneration. Therefore, temperature swinging and the feed of CO were
key to having high iNA reactor performance for NOx removal.