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| Effects of La contents on the structure and isomerization performance over solid superacid Ni-S2O82-/ZrO2-Al2O3 |
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SONG Hua1,2, ZHAO Lele1, SONG Hualin3, WANG Na1, LI Feng2
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(1.College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, China;2.Heilongjiang Provincial Key Laboratory of Chemical Engineering of Oil and Gas, Northeast Petroleum University, Daqing 163318, China;3.Key Laboratory of Cancer Prevention and Treatment of Heilongjiang Province, Mudanjiang Medical University, Mudanjiang 157011, China)
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| Abstract: |
| A series of La-Ni-S2O82-/ZrO2-Al2O3 (La-Ni-SZA) catalysts with different La mass fractions were prepared, which were characterized by XRD, BET, H2-TPR, FTIR and Py-IR techniques. The effects of the La content on the catalyst structure and isomerization performance were studied using n-petane isomerization as a probe reaction. The results show that the addition of an appropriate amount of La decreases the ZrO2 particle size of tetragonal phase in the catalyst, which improves the redox properties of the catalyst, and promotes the formation of L acid and B acid. The total acidity of catalysts decreases in the order of La(1.0)-Ni-SZA>Ni-SZA>SZA. The La(1.0)-Ni-SZA with La mass fraction of 1.0％ presents the best isomerization performance. At a reaction temperature of 140 ℃, a pressure of 2.0 MPa, a hydrogen/hydrocarbon molar ratio of 4, and a MHSV of 1.0 h-1, the isopentane yield reaches a maximum of 66.5％, which is significantly higher than the isopentane yield of Ni-SZA catalyst (55.0％) at the optimal reaction temperature of 180 ℃. |
| Key words: La Ni solid suoeracid n-pentane isomerization |
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