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A novel fused iron catalyst for ammonia synthesis promoted with rare earth gangue

Journal of Rare Earths 2008年第5期26卷 711-716页

作者：俞秀金林炳裕林建新王榕魏可镁 National Engineering Research Center of Chemical Fertilizer catalyst Fuzhou University

Rare earth gangue, which mainly consists of mixtures of light rare earths such as lanthana, ceria, neodymium oxide and praseodymium oxide, was used as the promoter of fused iron catalysts for ammonia synthesis. The result showed that the activity of the catalyst promoted with rare earth gangue was comparable with those of commercial iron catalysts with high amount of cobalt. The role of rare earths was owed to their advantages for favoring the deep reduction of the main composite in catalyst, i.e., iron oxide. This fmding indicated that the use of rare earth gangue could decrease the content of cobalt or even completely replace cobalt, which was used to be regarded as unsub- stitutable promoters for high performance ammonia catalyst; therefore, the cost of fused iron catalysts would decrease significantly.

关键词： rare earth gangue promoter fused iron catalyst ammonia synthesis

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Study on the Precursor Phase Composition of fused iron catalyst for Fischer-Tropsch Synthesis

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Chinese Chemical Letters 2005年第10期16卷 1393-1396页

作者： Ju Li SHEN Hua Zhang LIU Xiao Nian LI Weng Feng HAN Yi Fan ZHENG Catalysis Institute of Zhejiang University of Technology State Key Laboratory Breeding Base of Green-Chemistry Synthesis Technology Hangzhou 310014

The effect of the precursor composition of fused iron catalyst on the performance of Fischer-Tropsch synthesis was investigated. XRD, BET and CO2 adsorption experiments were carried out to provide better insight into the relationship therein. The results showed that the selectivity of C5＋ hydrocarbon products was dependent on the mole ratio of Fe^2＋/Fe^3＋, which was represented by a hump-shaped curve. catalysts with precursors containing Fe3O4 phase favored the magnetite spinal formation during F-T reaction, while Fe（1-x）O-based catalysts were more likely to favor the formation and growth of the iron carbide crystals.

关键词： Fischer-Tropsch synthesis fused iron catalyst precursor selectivity.

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