NOx reduction by CO over ASC catalysts in a simulated rotary reactor: Effect of reaction conditions. Issue 3 (June 2019)

• Record Type: Journal Article
• Authors: Sun, Peiliang; Cheng, Xingxing; Wang, Zhiqiang; Lai, Yanhua; Ma, Chunyuan; Chang, Jingcai
• Is Part Of: Journal of the Energy Institute. Volume 92:Issue 3(2019)
• Page Start: 488
• Page End: 501
• Publication Date: 2019-06
• Subjects: deNOx -- Rotary reactor -- O2 concentration -- GHSV -- Reduction time; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2018.04.009
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: A rotary reactor, separated the NOx removal process into adsorption stage and reduction stage, was utilized to remove the NOx from the flue gas. The influences of various reaction conditions on the reactor were tested, i.e., oxygen concentration in the adsorption zone, time ratio of adsorption and reduction, gas hourly space velocity (GHSV) of the reactor, GHSV of the reduction zone and effect of H2 O and SO2 . The results showed that the synthesized ASC catalyst had higher deNOx efficiency with the increasing of oxygen concentration in flue gas. Meanwhile, the GHSV of the reactor had an obvious influence on NOx adsorption, and high NOx adsorption and reduction efficiencies were observed at 10, 000 h −1 . The optimal reaction conditions in this research were concluded as follows: oxygen concentration was 8%, time ratio of adsorption and reduction was 60 s: 60 s, GHSV of the adsorption zone was 10, 000 h −1 and GHSV of the reduction zone was 12, 000 h −1 . While the water and SO2 tolerance of catalysts was weak, and the catalysts would be inactivated when exposed to 100 ppm SO2 in 1.5 h. Free nitrate ions were the main nitrate species on the catalyst surface. In situ DRIFT study showed that a large amount of free nitrate ions was released from the catalyst surface when the reduction time was increased from 30 s to 60 s, and much NOx was adsorbed on the catalyst surface in the form of free nitrate ions when the oxygen concentration was 8%. Highlights: deNOx performance of a novel rotary reactor under different conditions was investigated. High O2 concentration, low GHSV of reactor or long reduction time can lead to high deNOx efficiency. The influence of varied reaction conditions on the adsorption and reduction reactions was summarized.