Journal
FUEL PROCESSING TECHNOLOGY
Volume 152, Issue -, Pages 102-107Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2016.06.010
Keywords
Catalytic NO reduction; Flue gas cleaning; NOx emission; Activated-char
Funding
- Natural Science Foundation of China [21176109, U1361120, 21476100]
- Liaoning Outstanding Professorship Funding Program of Liaoning Province, China
- Australian Research Council Linkage Program [LP160100540]
- Australian National Low Emissions Coal Research Development [G4-1115-0255]
- Australian Research Council [LP160100540] Funding Source: Australian Research Council
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The development of lignite-char-supported metal oxide catalyst for reduction of nitric oxide (NO) is investigated in this paper. The characteristics of NO reduction by copper and iron oxide catalysts supported on activated lignite chars (ALC) was studied using a fixed-bed reactor at 300 degrees C. The results showed that the impregnation of Cu on ALC resulted in higher catalytic reactivity during NO reduction compared with that of Fe. Chemisorption of O-2 and NO on Cu/ALC catalyst was found to play an important role in denitrification. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analyses showed that chemically adsorbed oxygen facilitates the formation of C(O) complex and oxidation of Cu-0 to Cu+ for Cu/ALC catalyst. The C(O) intermediates and C* production formed due to the fact that C/O-2 reaction promoted the reduction of NO. It is suggested that the catalytic reaction of NO in this case comprised of C/O-2 reaction, C(O)/NO reaction and formation of N-2 and CO2. Cu seemed to have significantly promoted the C(O) formation and CO oxidation compared with Fe. The catalytic reactivity of Cu species for C(O) formation and CO oxidation followed the order of Cu-0>Cu+>Cu2+. Fe3O4 was believed to be the active phase in Fe catalyst. The oxygen and char-supported metal catalysts significantly promoted C/NO reaction, and therefore may lead to a lower operation temperature of NOx removal. (C) 2016 Elsevier B.V. All rights reserved.
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