Citation: LI Jiang-Bing, MA Hong-Fang, ZHANG Hai-Tao, SUN Qi-Wen, YING Wei-Yong, FANG Ding-Ye. Comparison of FeMn, FeMnNa and FeMnK Catalysts for the Preparation of Light Olefins from Syngas[J]. Acta Physico-Chimica Sinica, ;2014, 30(10): 1932-1940. doi: 10.3866/PKU.WHXB201408051 shu

Comparison of FeMn, FeMnNa and FeMnK Catalysts for the Preparation of Light Olefins from Syngas

1.
1. State Key Laboratory of Chemical Engineering, Engineering Research Center of Large Scale Reactor Engineering and Technology of the Ministry of Education, East China University of Science and Technology, Shanghai 200237, P. R. China;
2. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, The Xinjiang Uygur Autonomous Region, P. R. China;
3. State Key Laboratory of Coal Liquefaction and Coal Chemical Technology, Shanghai 201203, P. R. China

Received Date: 20 June 2014
Available Online: 5 August 2014
Fund Project:

The influence of sodium and potassium promoters on the structure and reaction behavior of an FeMn catalyst toward light olefin synthesis from syngas was investigated by N₂ adsorption, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), H₂ temperature-programmed reduction (H₂-TPR), CO/CO₂ temperature-programmed desorption (CO/CO₂-TPD), Mössbauer spectroscopy (MES) and CO+H₂ reaction. We found that an increase in manganese improves the dispersion of the active Fe component and light olefin selectivity; however, excessive enrichment with the Mn promoter on the catalyst surface suppresses CO conversion. Potassium and sodium inhibit the reduction of the catalyst in H₂ and improve the adsorption of CO₂ and CO because of the enhanced surface basicity of the catalysts. After reduction with syngas (n_H₂/n_CO=20) and reaction with syngas (n_H₂/n_CO=3.5), the analysis of the bulk structure was compared with those of the FeMn, FeMnNa, and FeMnK catalysts. The results show that FeC_x is found in relatively high levels in the FeMnK catalysts because of the stronger alkalinity and adsorbability of CO. However, Fischer-Tropsch synthesis (FTS) results indicate that sodium and potassium improved the selectivity toward light olefins. The best catalytic performance was achieved by the FeMnNa catalyst. Its CO conversion and light olefins selectivity were 96.2% and 30.5% (molar fraction), respectively.
- Light olefin,
- Fischer-Tropsch synthesis,
- FeMn catalyst,
- Sodium promoter,
- Potassium promoter
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