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 fixedbed reactor, which was used to simulate the working conditions change in the iNA reactor. Lab-synthesized Cu/FeCeO x were used as the catalyst. Two different modes were tested with the iNA reactor: short cycles and long cycles. Excellent NOx removal efficiencies of over 95% and 90% for short cycles and long cycles, respectively, were observed in the iNA reactor. Moreover, compared with the constant-temperature rotary reactor, better H 2 O and SO 2 resistances were also found in the iNA reactor.The reaction mechanism was proposed based on in situ diffuse reflectance infrared Fourier transform study. In the iNA process, 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.

Insight into the mechanism of direct N–C coupling in selective catalytic reduction of NO by CO over Ni(111)-supported graphene

“…8,9 Intensive experimental and theoretical efforts have been devoted to understanding the mechanism of the SCR of NO with CO, producing valuable chemicals, and designing and synthesizing highly efficient and stable catalysts. Currently, platinum-group metals, such as Pt, Pd, and Rh, 10–14 and transition metals, like Ce, Mn, Cu and Fe, 15–20 are known as efficient catalysts for the SCR of NO with CO, where NO and CO can be converted to harmless N 2 and CO 2 over these catalyst surfaces. However, the unstable performance and low metal usage efficiency seriously limit their further applications.…”