Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 11, Pages 8134-8145Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5004969
Keywords
NH3-SCR; CuO-CeO2-TiO2; acid sites; strong interactions; DRIFTS
Funding
- Ministry of Science and Technology, PR China [2010CB732304, 2013AA065302]
- National Natural Science Foundation of China [51202126, 51372137]
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A CuO-CeO2-TiO2 catalyst for selective catalytic reduction of NO with NH3 (NH3-SCR) at low temperatures was prepared by a sol gel method and characterized by X-ray diffraction, Brunner-Emmett-Teller surface area, ultraviolet-visible spectroscopy, H-2 temperature-programmed reduction, scanning electron microscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). The CuO-CeO2-TiO2 ternary oxide catalyst shows excellent NH3-SCR activity in a low-temperature range of 150-250 degrees C. Lewis acid sites generated from Cu2+ are the main active sites for ammonia activation at low temperature, which is crucial for low temperature NH3-SCR activity. The introduction of ceria results in increased reducibility of CuO species and strong interactions between CuO particles with the matrix. The interactions between copper, cerium and titanium oxides lead to high dispersion of metal oxides with increased active oxygen and enhanced catalyst acidity. Homogeneously mixed metal oxides facilitate the fast SCR reaction among Cu2+-NO, nitrate (coordinated on cerium sites) and ammonia (on titanium sites) on the CuO-CeO2-TiO2 catalyst at low temperatures.
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