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Study on the denitrification performance of FeLaO/activated coke for NH-SCR and the effect of CO escaped from activated coke at mid-high temperature on catalytic activity

Environmental Science and Pollution Research, ISSN: 1614-7499, Vol: 26, Issue: 20, Page: 20248-20263
2019
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Currently, activated coke is widely used in the removal of multiple pollutants from industrial flue gas. In this paper, a series of novel FeLaO/AC catalysts was prepared by the incipient wetness impregnation for NH-SCR denitrification reaction. The introduction of Fe-La bimetal oxides significantly improved the denitrification performance of activated coke at mid-high temperature, and 4% FeLaO/AC exhibited a superior NO conversion efficiency of 90.1% at 400 °C. The catalysts were further characterized by BET, SEM, XRD, Raman, EPR, XPS, FTIR, NH-TPD, H-TPR, et al., whose results showed that the perovskite-type oxide of LaFeO and oxygen vacancies were produced on the catalysts’ surfaces during roasting. Fe-La doping enhanced the amount of acid sites (mainly Lewis and other stronger acid sites) and the content of multifarious oxygen species, which were beneficial for NO removal at mid-high temperature. Moreover, it was investigated that the effect of released CO from activated coke at mid-high temperature on the NO removal through the lifetime test, in which it was found that a large amount of CO produced by pyrolysis of activated coke could promote the NO removal, and long-term escaping of CO on the activated coke carrier did not have a significant negative impact on catalytic performance. The results of the TG-IR test showed that volatile matter is released from the activated coke while TG results showed that the weight loss rate of 4% FeLaO/AC only was 0.0015~0.007%/min at 300–400 °C. Hence, 4% FeLaO/AC had excellent thermal stability and denitrification performance to be continuously used at mid-high temperature. Finally, the mechanisms were proposed on the basis of experiments and characterization results.

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