The highly efficient removal of HCN over CuMn/CeO catalytic material
In this work, porous CeO 2 flower-like spheres loaded with bimetal oxides were prepared to achieve effective removal of HCN in the lower temperature region of 30-150 °C. Among all samples, the CeO 2 loaded with copper and manganese oxides at the mass ratio of 8/2 (Cu 8 Mn 2 /CeO 2 ) exhibited the hi...
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Published in | RSC advances Vol. 11; no. 15; pp. 8886 - 8896 |
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Main Authors | , , , , , , |
Format | Journal Article |
Published |
26.02.2021
|
Online Access | Get full text |
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Summary: | In this work, porous CeO
2
flower-like spheres loaded with bimetal oxides were prepared to achieve effective removal of HCN in the lower temperature region of 30-150 °C. Among all samples, the CeO
2
loaded with copper and manganese oxides at the mass ratio of 8/2 (Cu
8
Mn
2
/CeO
2
) exhibited the highest catalytic activity: the HCN removal rate was nearly 100% at 90 °C at the conditions of 120 000 h
−1
and 5 vol% H
2
O, the catalytic activity of which was higher than for other reported catalysts. The introduction of MnO
x
could improve the dispersion of CuO particles and increase the total acid sites of the prepared samples. It was proved that the synergy between CuO and MnO
x
, the chemisorption oxygen, the oxygen vacancies, the Cu
2+
and Mn
4+
all played an important role in determining the good catalytic activity of the prepared samples. NH
3
-TPD analysis indicated the introduction of MnO
x
promoted the conversion of NH
3
and N
2
selectivity by increasing the acid sites of the sample. According to the C, N balance data and FT-IR results, when the temperature was below 30 °C, the removal of HCN over Cu
8
Mn
2
/CeO
2
was mainly by chemisorption and the HCN breakthrough behaviors corresponded to the Yoon and Nelson's model. When temperature was above 120 °C, the HCN was totally removed by catalytic hydrolysis and catalytic oxidation.
In this work, porous CeO
2
flower-like spheres loaded with bimetal oxides were prepared to achieve effective removal of HCN in the lower temperature region of 30-150 °C. |
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Bibliography: | 10.1039/d0ra10177j Electronic supplementary information (ESI) available. See DOI |
ISSN: | 2046-2069 |
DOI: | 10.1039/d0ra10177j |