TY - JOUR
T1 - Effects of different exposed crystal surfaces of CeO2 loaded on an MnO2/X catalyst for the NH3-SCR reaction
AU - Wang, Shihao
AU - Li, Xiaodi
AU - Ren, Shan
AU - Xing, Xiangdong
AU - Chen, Lin
AU - Yang, Jie
AU - Liu, Manyi
AU - Xie, Yixin
N1 - Publisher Copyright:
© 2022 The Royal Society of Chemistry
PY - 2022/6/17
Y1 - 2022/6/17
N2 - To study the effects of the loading of different exposed crystal surfaces of CeO2 on an MnO2/X catalyst for the NH3-selective catalytic reduction (SCR) reaction, Mn/X, Mn-CeNP/X, Mn-CeNC/X and Mn-CeNR/X catalysts were synthesized via a solid-state diffusion method. Scanning electron microscopy (SEM), X-ray diffractometry (XRD), Brunauer-Emmett-Teller (BET) analysis, X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H2-TPR), ammonia temperature-programmed desorption (NH3-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements were used to characterize the physicochemical properties and reaction mechanism of the prepared catalysts. The results exhibted that the Mn-CeNC/X catalyst showed superior low-temperature activity in the range of 100-200 °C, and the Mn-CeNR/X catalyst showed better N2 selectivity and SO2 resistance in the NH3-SCR reaction. This indicated that the loading of different exposed crystal surfaces of CeO2 could have a huge impact on the SCR performance of Mn/X catalysts. According to the characterization results, the surperior low-temperature SCR activity of the Mn-CeNC/X catalyst could be attributed to its abundant acidic sites, excellent reducibility, high Mn4+/(Mn2+ + Mn3+ + Mn4+) ratio and abundant surface chemisorbed labile oxygen. However, the Mn-CeNR/X catalyst exhibited better N2 selectivity in the NH3-SCR reaction, which could be attributed to the low ratio of Mn4+/(Mn4+ + Mn3+ + Mn2+) and its strong adsorption capacity toward NO. Finally, possible reaction pathways and a mechanism model of the Mn-CeNC/X catalysts were proposed.
AB - To study the effects of the loading of different exposed crystal surfaces of CeO2 on an MnO2/X catalyst for the NH3-selective catalytic reduction (SCR) reaction, Mn/X, Mn-CeNP/X, Mn-CeNC/X and Mn-CeNR/X catalysts were synthesized via a solid-state diffusion method. Scanning electron microscopy (SEM), X-ray diffractometry (XRD), Brunauer-Emmett-Teller (BET) analysis, X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H2-TPR), ammonia temperature-programmed desorption (NH3-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements were used to characterize the physicochemical properties and reaction mechanism of the prepared catalysts. The results exhibted that the Mn-CeNC/X catalyst showed superior low-temperature activity in the range of 100-200 °C, and the Mn-CeNR/X catalyst showed better N2 selectivity and SO2 resistance in the NH3-SCR reaction. This indicated that the loading of different exposed crystal surfaces of CeO2 could have a huge impact on the SCR performance of Mn/X catalysts. According to the characterization results, the surperior low-temperature SCR activity of the Mn-CeNC/X catalyst could be attributed to its abundant acidic sites, excellent reducibility, high Mn4+/(Mn2+ + Mn3+ + Mn4+) ratio and abundant surface chemisorbed labile oxygen. However, the Mn-CeNR/X catalyst exhibited better N2 selectivity in the NH3-SCR reaction, which could be attributed to the low ratio of Mn4+/(Mn4+ + Mn3+ + Mn2+) and its strong adsorption capacity toward NO. Finally, possible reaction pathways and a mechanism model of the Mn-CeNC/X catalysts were proposed.
UR - https://www.scopus.com/pages/publications/85133559389
U2 - 10.1039/d2ce00570k
DO - 10.1039/d2ce00570k
M3 - 文章
AN - SCOPUS:85133559389
SN - 1466-8033
VL - 24
SP - 4991
EP - 5002
JO - CrystEngComm
JF - CrystEngComm
IS - 27
ER -