不同元素掺杂锰基催化剂的NH3-SCR反应性能研究

doi:10.19964/j.issn.1006-4990.2022-0640

Abstract

Abstract:

In order to study the influence of the acid-base and redox capacity of the catalyst on the NH₃-SCR performance of pure manganese oxide catalyst，the alkaline earth metals of Sr，transition metals of Ce，Fe and nonmetal of Si were selected to modify the pure manganese oxide catalyst.All catalysts were prepared by coprecipitation method.The catalysts were characterized by XRD，N₂-BET，NH₃-TPD，XPS and H₂-TPR.The XRD results showed that the main phases of the manganese-based catalyst prepared by the method used in this experiment were Mn₂O₃ and Mn₅O₈.The N₂-BET results showed that Ce、Fe、Si could effectively increase the specific surface area of pure manganese oxides.The NH₃-TPD and XPS showed that the introduction of Ce、Fe、Si increased the content of oxygen（O_Ⅱ） and Mn⁴⁺ on the surface of pure manganese oxides，the doping of Ce and Si increased the total acid content of the catalyst，and Fe effectively regulated the distribution of acid sites.The H₂-TPR showed that all the elements except Ce weakened the redox capacity of pure manganese oxide catalyst.The denitrification activity of all catalysts was tested at 100~400 ℃.MnCeO _x showed excellent denitrification activity at low temperature and MnSiO _x showed good denitrification activity at medium and high temperature.

Key words: NH₃-SCR, Mn₂O₃, Mn₅O₈

CLC Number:

TQ137.12

TAN Renjun, LUO Shizhong, WANG Tao, DU Peining, JING Fangli. Study on NH₃-SCR performance of manganese based catalysts doped with different elements[J]. Inorganic Chemicals Industry, 2023, 55(7): 115-121.

Figures/Tables 11

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催化剂名称	BET比表面积/（m²·g^-1）	比孔容/ （cm³·g^-1）	平均孔径/ nm
MnO _x	9.8	0.05	20.5
MnSiO _x	122.7	0.27	8.7
MnSrO _x	10.0	0.07	27.1
MnCeO _x	52.0	0.26	20.3
MnFeO _x	34.2	0.18	20.7

催化剂名称	NH₃脱附量/（mmol·g^-1）
催化剂名称	峰1	峰2	峰3	总脱附量
MnO _x	0.006	0.011	0.053	0.070
MnSiO _x	0.029	0.078	0.082	0.189
MnSrO _x	0.005	0.016	0.058	0.079
MnCeO _x	0.027	0.053	0.079	0.159
MnFeO _x	0.013	0.030	0.012	0.055

催化剂名称	O物种物质的量比 n（O_Ⅰ）/n（O_Ⅱ）/n（O_Ⅲ）	Mn物种物质的量比 n（Mn²⁺）/n（Mn³⁺）/n（Mn⁴⁺）
MnO _x	50.1/27.7/22.2	7.0/59.3/33.7
MnSiO _x	42.2/33.3/24.5	—/55.8/44.2
MnSrO _x	53.6/28.8/17.6	7.6/57.1/35.3
MnCeO _x	42.3/34.7/23.0	—/54.5/45.5
MnFeO _x	48.1/37.8/14.1	—/54.7/45.3

催化剂名称	温度/℃			总耗氢量/ （mmol·g^-1）
催化剂名称	峰1	峰2		总耗氢量/ （mmol·g^-1）
MnO _x	334	456	0.270
MnSiO _x	344	504	0.188
MnSrO _x	351	478	0.242
MnCeO _x	314	426	0.164
MnFeO _x	372	475	0.216

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on NH₃-SCR performance of manganese based catalysts doped with different elements

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