期刊
CATALYSIS LETTERS
卷 145, 期 7, 页码 1413-1419出版社
SPRINGER
DOI: 10.1007/s10562-015-1533-4
关键词
Metallic Co species; Cracking; Tetrahedral Co2+ ions; Surface Co spinel; Propylene
资金
- National Natural Science Foundation of China [U1362201]
- Fundamental Research Funds for the Central Universities [R1404019A]
Co/Al2O3 catalysts with different Co3O4 loadings were studied in catalytic dehydrogenation of propane. The optimal results of 21.5 wt% propylene yield and 83.6 % selectivity were obtained at 5 wt% loading. XRD, DRS and XPS results showed that at loadings below 10 wt%, the surface Co spinel formed from tetrahedral Co2+ ions during the course of reaction constituted the active site for dehydrogenation reaction. Whereas at high loadings (above 10 wt%), only Co3O4 crystallites presented, which were easily reduced to metallic Co species, resulting in dramatically enhanced cracking reaction and the formation of abundant methane. [GRAPHICS] .
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