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Effect of Potassium Nitrate Modification on the Performance of Copper‐Manganese Oxide Catalyst for Enhanced Soot Combustion
Author(s) -
Zhao Han,
Zhou Xiaoxia,
Huang Weimin,
Pan Linyu,
Wang Min,
Li Qinru,
Shi Jianlin,
Chen Hangrong
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201701735
Subject(s) - catalysis , soot , manganese , combustion , copper , copper oxide , phase (matter) , potassium , chemical engineering , inorganic chemistry , oxide , chemistry , catalytic combustion , nanoparticle , materials science , nanotechnology , organic chemistry , engineering
An enhanced catalytic activity and improved reusability were achieved by applying facile KNO 3 modification during the synthesis of a copper‐manganese mixed oxide (CuMnO). Upon KNO 3 modification, the characteristic finishing temperature ( T f ) of catalytic soot combustion was decreased from 360 °C for CuMnO to 338 °C for the K‐modified product CuMnO(K). Moreover, this T f value for CuMnO(K) remained remarkably low (346 °C) even after five runs of an activity test. The excellent performance of CuMnO(K) is attributed to its well‐dispersed nanoparticle morphology, which is totally different from the microspherical features of CuMnO and is beneficial for its sufficient contact with the soot particles. Additionally, an interesting phase evolution of CuMnO(K) was observed for the first time from Cu 1.5 Mn 1.5 O 4 to the mixed phases of CuO, K 2 Mn 4 O 8 , and MnO x during the consecutive test runs. These mixed phases are believed to be responsible for the enhancement and stabilization of the catalytic activity. Furthermore, the mechanism for the morphology transformation upon KNO 3 modification and for the phase evolution during soot combustion was investigated.