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Regulating acid sites by transition metals to promote C-H bond cracking ability of Pd catalysts for methane complete combustion performance improvement
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Lianghui XIA1, Jingjing WANG1, Yanfei JIAN1, Yujie LIU1, Chi HE1, 2
Thermal Power Generation | 2024, 53(7) : 135 - 142
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Thermal Power Generation | 2024, 53(7): 135-142
• Thermal energy science research •
Regulating acid sites by transition metals to promote C-H bond cracking ability of Pd catalysts for methane complete combustion performance improvement
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Lianghui XIA1, Jingjing WANG1, Yanfei JIAN1, Yujie LIU1, Chi HE1, 2
Affiliations
  • 1.State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
  • 2.National Engineering Laboratory for VOCs Pollution Control Material & Technology, Beijing 101408, China
Published: 2024-07-25 doi: 10.19666/j.rlfd.202402036
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Methane is one of the main components of atmospheric pollutants, which is challenging to be eliminated by catalytic oxidation under mild conditions because of its tetrahedral structure stability. In this work, the acidic sites of Pd-based catalysts are modified by introducing transition metals (Cr, Mo, W) to promote the cleavage of C-H bonds and therefore to enhance the catalytic oxidation performance of methane. The oxygen vacancies, acidity and redox property of prepared catalysts are systematically characterized by XRD, Raman, H2-TPR and NH3-TPD techniques. The results show that, the transition metal modification increases the acidic site of Pd catalysts obviously, and the modified PdM catalysts have a higher amount of oxygen vacancies. However, only Mo modified PdMo catalyst exhibits better redox performance, while Cr and W modified PdCr and PdW catalysts show slightly lower redox performance. The results of the methane oxidation reaction confirm that the PdMo catalyst with moderate acidic sites displays excellent performance in the methane oxidation reaction, and its T90 decreases by about 150 ℃, while the PdCr and PdW catalysts with more and less acidic sites show lower methane oxidation activity. The results indicate that the number of acid sites and the redox properties of the catalyst jointly determine the methane oxidation performance. This conclusion provides critical insights for design and preparation of catalysts for complete oxidation of methane at low temperatures.

methane  /  Pd catalysts  /  transition metal  /  acidic site  /  redox property
Lianghui XIA, Jingjing WANG, Yanfei JIAN, Yujie LIU, Chi HE. Regulating acid sites by transition metals to promote C-H bond cracking ability of Pd catalysts for methane complete combustion performance improvement[J]. Thermal Power Generation, 2024 , 53 (7) : 135 -142 . DOI: 10.19666/j.rlfd.202402036
Funding
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  • National Key Research and Development Plan(2022YFB4101500)
  • National Natural Science Foundation of China(22276145; 21922606)
Appendix
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Year 2024 volume 53 Issue 7
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Article Info
doi: 10.19666/j.rlfd.202402036
  • Receive Date：2024-02-20
  • Online Date：2026-01-07
  • Published：2024-07-25
Article Data
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History
  • Received：2024-02-20
Funding
National Key Research and Development Plan(2022YFB4101500)
National Natural Science Foundation of China(22276145; 21922606)
Affiliations
    1.State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    2.National Engineering Laboratory for VOCs Pollution Control Material & Technology, Beijing 101408, China
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表12种不同金属材料的力学参数
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Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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