Study on catalytic oxidation characteristics and influencing factors of Cu-Mn type CO catalyst

doi:10.16265/j.cnki.issn1003-3033.2025.01.0309

Abstract

Abstract:

In order to study the effect of different metal doping and precipitation temperatures on the catalytic oxidation of CO by Cu-Mn type catalyst, the co-precipitation method was used to prepare Cu-Mn type CO catalyst, and the catalytic oxidation of CO by Cu-Mn type CO catalyst under different metal doping and precipitation temperatures was tested and analyzed. The pore characteristics and surface crystal structure of the catalyst were obtained by automatic physical adsorption analyzer and X-ray diffraction (XRD). The reaction process of catalytic oxidation of CO was revealed by in-situ diffuse reflection infrared spectroscopy, and the potential application of the catalyst in coal mines was introduced. The results show that during the test time (within 80 s), with the increase of reaction time, the volume fraction of CO gradually decreased, slowly increased and then tended to be flat, and the amount of reactive CO substance gradually increased. The better the catalytic oxidation of CO, the larger the specific surface area, the smaller the average pore size and the larger the total pore volume. When the doped metals are Sn, Fe and Ce, the catalytic oxidation characteristics of the three catalysts are as follows: CuMnO_x-Ce>CuMnO_x-Sn>CuMnO_x-Fe, the amount of CO involved in the reaction was 0.015 3, 0.009 3 and 0.020 3 mol, and the removal efficiency of CO was 61%, 47% and 77%, respectively. When the precipitation temperature is 70 ℃, the number of crystal nuclei of the catalyst is significantly higher than that of the precipitation temperature is 60 and 80 ℃. When the precipitation temperature is 60, 70 and 80 ℃ respectively, the catalytic oxidation characteristics of the three catalysts are as follows: CuMnO_x-Ce-70>CuMnO_x-Ce-80>CuMnO_x-Ce-60, the amount of CO involved in the reaction was 0.019 45, 0.020 3 and 0.019 8 mol, and the elimination rates of CO were 74%, 77% and 75%, respectively. Abundant surface oxygen vacancy is the key factor to improve the performance of CO oxidation reaction and catalytic oxidation. The presence of CeO₂ contributes to the formation, oxygen activation and migration of carbon-containing species.

Key words: Cu-Mn type CO catalyst, catalytic oxidation characteristic, metal doping, precipitation temperature, CO volume fraction

CLC Number:

ZHOU Luhan, JIANG Yanhang, LI Xu, SUN Yashengnan, WANG Lixin. Study on catalytic oxidation characteristics and influencing factors of Cu-Mn type CO catalyst[J]. China Safety Science Journal, 2025, 35(1): 127-136.

Figures/Tables 12

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Fig.5

Fig.6

Fig.7

Table 2

Fig.8

Fig.9

Fig.10

References 16

[1]	孙亚胜男. 煤矿井下空间CO消融特性及影响机制研究[D]. 阜新: 辽宁工程技术大学, 2021.
	SUN Yashengnan. Research on CO elimination characteristics and influence mechanism in underground coal mine[D]. Fuxin: Liaoning Technical University, 2021.
[2]	CIMINO S, LISI L, TOTARELLA G, et al. Highly stable core-shell Pt-CeO₂ nanoparticles electrochemically deposited onto fecralloy foam reactors for the catalytic oxidation of CO[J]. Journal of Industrial and Engineering Chemistry, 2018,66:404-410.
[3]	胡嘉. Pd/Cu修饰OMS-2催化剂低温催化氧化CO性能研究[D]. 昆明: 昆明理工大学, 2019.
	HU Jia. Study on low temperature catalytic oxidation of CO over OMS-2 catalyst modified by Pd/Cu[D]. Kunming: Kunming University of Science and Technology, 2019.
[4]	黄志超, 王际童, 马成, 等. 低负载Pd/Al₂O₃催化剂的制备及其对CO室温催化性能研究[J]. 工业催化, 2021, 29(2):33-41. doi: 10.3969/j.issn.1008-1143.2021.02.006
	HUANG Zhichao, WANG Jitong, MA Cheng, et al. Preparation of Pd/Al₂O₃ catalyst with low Pd loading amount for CO oxidation at room temperature[J]. Industrial Catalysis, 2021, 29(2):33-41. doi: 10.3969/j.issn.1008-1143.2021.02.006
[5]	GULYAEV R V, SLAVINSKAYA E M, NOVOPASHIN S A, et al. Highly active PdCeO composite catalysts for low-temperature CO oxidation, prepared by plasma-arc synthesis[J]. Applied Catalysis B:Environmental, 2014,147:132-143.
[6]	柯国洲. Au-Ag/SBA-15催化剂的制备及其对CO催化氧化性能的研究[D]. 大连: 大连理工大学, 2013.
	KE Guozhou. Preparation of Au-Ag/SBA-15 catalyst and investigation of its catalytic performance for CO oxidation[D]. Dalian: Dalian University of Technology, 2013.
[7]	YEN Chunwan, LIN Mengliang, WANG Aiqin, et al. CO oxidation catalyzed by Au-Ag bimetallic nanoparticles supported in mesoporous silica[J]. The Journal of Physical Chemistry C, 2009, 113(41):17 831-17 839.
[8]	MOBINI S, MESHKANI F, REZAEI M. Supported Mn catalysts and the role of different supports in the catalytic oxidation of carbon monoxide[J]. Chemical Engineering Science, 2019,197:37-51.
[9]	SUN Yashengnan, ZHOU Xihua, BAI Gang, et al. Removal of CO generated by a gas explosion using a Cu-Mn elimination agent[J]. ACS Omega, 2021, 6(24):16 140-16 150.
[10]	陈然, 高晓亚, 王晶, 等. Ce改性Fe₂O₃催化剂对CO催化氧化的影响[J]. 化工进展, 2017, 36(10):3737-3742. doi: 10.16085/j.issn.1000-6613.2017-0090
	CHEN Ran, GAO Xiaoya, WANG Jing, et al. Effect of Ce modified Fe₂O₃ catalyst on CO catalytic oxidation[J]. Chemical Progress, 2017, 36(10):3737-3742.
[11]	申宏鹏, 黄金花, 李磊, 等. CuO-CeO₂/MO_x-Al₂O₃催化剂催化CO氧化性能的研究[J]. 应用化工, 2020, 49(9):2265-2269.
	SHEN Hongpeng, HUANG Jinhua, LI Lei, et al. Study on catalytic performance of CuO-CeO₂/MO_x-Al₂O₃ catalyst in carbon monoxide oxidation[J]. Applied Chemical Industry, 2020, 49(9):2265-2269.
[12]	刘小元. CeO₂基催化剂的制备及其CO氧化性能研究[D]. 合肥: 中国科学技术大学, 2019.
	LIU Xiaoyuan. Synthesize of CeO₂-based catalysts and their CO oxidation[D]. Hefei: University of Science and Technology of China, 2019.
[13]	WANG Beibei, ZHANG Hui, XU Wei, et al. Nature of active sites on Cu-CeO₂ catalysts activated by high-temperature thermal aging[J]. ACS Catalysis, American Chemical Society, 2020, 10(21):12 385-12 392.
[14]	DEY S, DHAL G C, MOHAN D, et al. Cobalt doped CuMnO_x catalysts for the preferential oxidation of carbon monoxide[J]. Applied Surface Science, 2018,441:303-316.
[15]	ZHENG Yan'e, LI Kongzhai, WANG Hua, et al. Structure dependence and reaction mechanism of CO oxidation: a model study on macroporous CeO₂ and CeO₂-ZrO₂ catalysts[J]. Journal of Catalysis, 2016,344:365-377.
[16]	WU Ke, FU Xinpu, YU Wenzhu, et al. Pt-Embedded CuO_x-CeO₂ multicore-shell composites: interfacial redox reaction-directed synthesis and composition-dependent performance for co oxidation[J]. ACS Applied Materials & Interfaces, 2018, 10(40):34 172-34 183.

样品名称	比表面积/ (m²·g^-1)	平均孔径/nm	总孔容/ (cm³·g^-1)
CuMnO_x-Sn	86.04	10.88	0.26
CuMnO_x-Fe	58.34	15.49	0.22
CuMnO_x-Ce	88.71	10.32	0.28

样品名称	比表面积/ (m²·g^-1)	平均孔径/nm	总孔容/ (cm³·g^-1)
CuMnO_x-Ce-60	68.71	11.01	0.24
CuMnO_x-Ce-70	88.71	10.32	0.28
CuMnO_x-Ce-80	72.23	14.82	0.25