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New Nanocrystalline Cu/MnO x Catalysts Prepared from Supercritical Antisolvent Precipitation
Author(s) -
Tang ZiRong,
Jones Christopher D.,
Aldridge James K. W.,
Davies Thomas E.,
Bartley Jonathan K.,
Carley Albert F.,
Taylor Stuart H.,
Allix Mathieu,
Dickinson Calum,
Rosseinsky Matthew J.,
Claridge John B.,
Xu Zhongling,
Crudace Mandy J.,
Hutchings Graham J.
Publication year - 2009
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.200900195
Subject(s) - nanocrystalline material , supercritical fluid , calcination , crystallite , spinel , materials science , tetragonal crystal system , chemical engineering , catalysis , coprecipitation , precipitation , mineralogy , crystal structure , crystallography , metallurgy , nanotechnology , chemistry , organic chemistry , physics , meteorology , engineering
Supercritical CO 2 is used as an antisolvent to precipitate out nanostructured homogeneous mixtures of Cu 2+ and Mn 3+ with crystallites of 10–20 nm in diameter. Following calcination, this material forms a crystalline tetragonal spinel, CuMn 2 O 4 , with a branched chainlike structure with a length of 160–200 nm and diameters of approximately 40 nm. This new material is more than twice as active per unit surface area as the conventionally prepared hopcalite catalysts for the oxidation of carbon monoxide. This is the first time that homogeneous mixed oxides have been formed using this method.