Abstract
In this paper, the porous CeO2 flowerlike spheres support and a series of CuO/CeO2 prepared by different methods were synthesized. The SEM, XRD, BET, H2-TPR and FT-IR characterization were conducted to probe the physicochemical properties of the samples. To evaluate the HCN catalytic removal efficiency over the prepared samples, the breakthrough time of HCN over different samples were investigated. The results implied the CuO/CeO2 prepared by precipitation method (donated as Ce-5) showed highest catalytic activity, the breakthrough time of which was more than 70 min at 30 °C. It was proved the dispersion of CuO phase on the support, the redox properties and the interaction between CuO and CeO2 support over CuO/CeO2 played an important role in the HCN catalytic removal process. FT-IR analysis demonstrated the CuCN was generated due to the chemisorption of CuO and HCN.
Highlights
Hydrogen cyanide (HCN), which is colorless and poisonous with boiling point of 26 °C, comes from various sources, including the combustion of fossil, selective reduction of NOx, polymer pyrolysis and yellow phosphorus production [1,2,3]
Wang [10] reported that La1Cuy9/TiO2 showed the best performance for HCN removal, the removal rate of 100 ppm HCN over which could achieve 100%
From the figure 2(2) and 2(6), it can be seen that pore structure was formed by interweaved nanosheets on the surface of support, which testified CuO particles were uniformly dispersed on the CeO2 support
Summary
Hydrogen cyanide (HCN), which is colorless and poisonous with boiling point of 26 °C , comes from various sources, including the combustion of fossil, selective reduction of NOx, polymer pyrolysis and yellow phosphorus production [1,2,3]. There are main four methods for the removal of HCN, including absorption, combustion, catalytic hydrolysis and catalytic oxidation [7]. TiO2 anatase exhibited a high HCN hydrolysis activity and could attain 90% conversion at 400 °C. Ma [11] reported the DI-20Al-Ti prepared by self-assembly method can achieve 100% HCN conversion and 90% CO selectivity at 250°C, which was attributed to its large specific surface area, high dispersion of micropore, and a mass of alkaline sites. Hu [12] prepared Fe-Cu/ HZSM-5 catalytic material by sol-gel method, the HCN conversion and N2 selectivity over which were 100% and 80% at 250°C. The synergetic of bio-metal of Fe-Cu/ HZSM-5 enhance the reduction performance toward HCN due to the increase of dispersion of metal oxide compared with load single metal
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