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Citation: CHENG Jiang-hao, SU Ya-xin, LIN Rui, ZHANG Xian-wei, WEN Ni-ni, DENG Wen-yi, ZHOU Hao. Experimental study on the selective catalytic reduction of NO by C3H6 over Cu modified Fe/Al-PILC catalysts[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(7): 823-833. shu

Experimental study on the selective catalytic reduction of NO by C3H6 over Cu modified Fe/Al-PILC catalysts

  • 1.

    School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China

  • 2.

    Changzhou Vocational Institute of Engineering, Changzhou 213164, China

  • Corresponding author: SU Ya-xin, suyx@dhu.edu.cn
  • Received Date: 28 March 2019
    Revised Date: 10 May 2019

    Fund Project: National Natural Science Foundation of China 51278095Jiangsu Province Natural Science Foundation BK20181161The project was supported by Jiangsu Province Natural Science Foundation (BK20181161), the Fundamental Research Funds for the Central Universities (2232019D3-24), and National Natural Science Foundation of China (51278095)the Fundamental Research Funds for the Central Universities 2232019D3-24

Figures(9)

  • In order to improve the low temperature activity of Fe/Al-PILC catalysts for SCR of NO, copper doping was used for the modification. xCu-Fe/Al-PILC catalysts were prepared by ultrasonic impregnation technique and characterized by XRD, N2 adsorption-desorption, H2-TPR, UV-vis, XPS and Py-FTIR. The SCR of NO with C3H6 tests were carried out in a fixed bed reactor. The experimental results showed that the xCu-Fe/Al-PILC catalysts can effectively solve the problem of insufficient SCR activity of Fe/Al-PILC catalysts at low temperature and as well as improve the activity at medium and high temperature. High NO reduction efficiency, 80% and beyond could be achieved at a wide temperature range of 200-500℃ by the catalysts, among which 0.13Cu-Fe/Al-PILC exhibited 90% of the NO conversion at 250-500℃ and maximum NO reduction efficiency of 93% at 250℃. XRD and N2 adsorption-desorption results proved that the catalysts modified by copper provided more active sites and increased the reaction rate. The results of H2-TPR indicated that the doping of copper improved the catalyst's redox ability at lower temperature, while enhanced the catalyst's redox ability at medium and high temperature. UV-vis and XPS study showed that the doping of copper not only increased the higher oxidation state of iron but also produced more isolated Fe3+ which is the low-temperature active species. Py-FTIR test illustrated that Lewis acid and Brönsted acid existed simultaneously on the catalyst surface, and Lewis acid sites were the activity center of the SCR reaction.
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