Catalytic Denitration Performance and Mechanism of Copper-Loaded Ni0.09Ti0.91O2 Nanotube
With the increasing pollution of nitrogen oxides,the development of denitration catalysts has become a key factor for the treatment.In this research,copper-loaded Ni0.09Ti0.91O2 nanotube denitration catalysts were prepared by hydrothermal and calcination two-step methods.The structure and catalytic denitration performance were studied.The nanotube structure of the catalysts was determined by N2 adsorption-desorption,X-ray diffraction,scanning electron microscopy,transmission electron microscopy and other methodologies.Results show that Ni0.09Ti0.91O2 nanotubes have anatase structures,and copper atomic clusters are distributed on the surface of the nanotubes.Nitrogen adsorption and desorption tests show that the specific surface area of Ni0.09Ti0.91O2 before and after loading copper is 263.51 and 216.54 m2·g-1,respectively.The copper on the surface of the nanotubes is uniformly dispersed.The denitration efficiency of Ni0.09Ti0.91O2 nanotube with 7wt％copper nearly reaches 100％,which is higher than that of the nanotube catalyst without copper,and it has good anti-poisoning performance.The results of in-situ diffuse reflection infrared spectroscopy tests show that the NH3-SCR process of copper-loaded Ni0.09Ti0.91O2 follows the L-H mechanism.In this research,the denitration performance of copper-loaded Ni0.09Ti0.91O2 nanoparticle was also studied as a comparison.The catalyst of Ni0.09Ti0.91O2 nanotube loaded with 7wt％copper shows the best denitrification and anti-poisoning properties,presenting good application prospects.
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