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Citation: LI Li-Min, XU Wei, WANG Li-Kui. Mössbauer Spectroscopy of Zr- and Ca-containing Fused Iron Catalysts for Ammonia Synthesis[J]. Chinese Journal of Applied Chemistry, ;2003, 20(2): 155-158. shu

Mössbauer Spectroscopy of Zr- and Ca-containing Fused Iron Catalysts for Ammonia Synthesis

1.
Department of Chemistry, Zhengzhou University, Zhengzhou 450052

Corresponding author: LI Li-Min,
Received Date: 19 July 2002
Available Online: 12 November 2002
Fund Project: 河南省教育厅自然科学基金资助项目(98150009) (98150009)

Møssbauer spectra of Zr- and Ca-containing fused iron catalysts for ammonia synthesis have been investigated. The results show that the presence of Zr(Ⅳ) in the octahedral B sites of Fe₃O₄ results in the expansion of B sites, facilitating the reduction of the catalyst and uniform distribution of Al(Ⅲ). For the catalysts containing both Zr⁴⁺ and Ca²⁺ ions the number of Zr⁴⁺ entering Fe₃O₄ lattice decreases due to the interaction between zirconium and calcium, and the Fe²⁺ ions are reduced more easily at A site of the catalysts. Such a phenomenon occurs more clearly for spherical catalysts obtained from rapid cooling by water.
- Mössbauer spectroscopy,
- catalyst containing Zr,
- catalyst containing Ca,
- fused iron catalyst,
- ammonia synthesis
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