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Removing NO x , CO and HC from automobile exhaust based on chemical looping combustion
Author(s) -
Wu Yongjian,
Luo Chunhuan,
Wu Wei,
Su Qingquan
Publication year - 2019
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6103
Subject(s) - oxygen , chemistry , chemical looping combustion , carbon monoxide , combustion , catalysis , exhaust gas , oxide , metal , inorganic chemistry , organic chemistry
Background To meet more stringent automobile exhaust emission standards without using platinum group metal three‐way catalysts (TWCs), two nonprecious metal oxide oxygen carriers, Cu10/Al90 and Ni10/Al90, were investigated for the simultaneous and thorough removal of nitrogen oxides (NO x ), carbon monoxide (CO) and hydrocarbons (HC) from automobile exhaust. Results In oxidation reactions of the reductive oxygen carriers with NO, the reductive oxygen carriers were converted to the oxidative oxygen carriers and NO was simultaneously reduced to N 2 . Then, the oxidative oxygen carriers were regenerated to the reductive oxygen carriers with reducing gases, including CO, H 2 and HC. At the same time, CO was converted to CO 2 , H 2 was converted to H 2 O, and HC was converted to CO 2 and H 2 O. The simultaneous removal of NO x , CO and HC could be achieved based on a chemical looping combustion mechanism. Compared with Ni10/Al90, Cu10/Al90 exhibited better performance for removing NO, CO and C 3 H 6 from simulated automobile exhaust. However, the reductive Ni10/Al90 had an excellent steam reforming catalytic activity and was capable of converting residual C 3 H 6 in the exhaust to harmless H 2 and CO 2 . Conclusion Based on these findings, a novel chemical looping combustion process is proposed, in which the first oxygen carrier‐filling layer based on Cu10/Al90 removed NO x , CO and HC simultaneously, and the second oxygen carrier‐filling layer based on Ni10/Al90 removed residual NO and C 3 H 6 . © 2019 Society of Chemical Industry