Performance of Pt/MgAPO-11 Catalysts in the Hydroisomerization of n-dodecane |
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Authors: | Xiaomei Yang Zhusheng Xu Zhijian Tian Huaijun Ma Yunpeng Xu Wei Qu Liwu Lin |
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Affiliation: | (1) Laboratory of Natural Gas Utilization and Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshang Road, Dalian, 116023, P.R. China;(2) Graduate School of the Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, P.R. China;(3) State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshang Road, Dalian, 116023, P.R. China |
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Abstract: | MgAPO-11 molecular sieves with varying Mg contents synthesized by the hydrothermal method were used as supports for bifunctional
Pt/MgAPO-11 catalysts. MgAPO-11 molecular sieves and the corresponding catalysts were characterized by X-ray diffraction (XRD),
X-ray fluorescence spectroscopy (XRF), temperature-programmed desorption of NH3 (NH3-TPD), differential thermogravimetric (DTG) analysis, temperature-programmed reduction of H2 (H2-TPR), H2 chemisorption and catalytic reaction evaluation. The results indicated that the acidity generated via the substitution of Mg2+ for Al3+ in the framework increased with the Mg content. Acting as acidic components, the MgAPO-11 molecular sieves loaded with Pt
were tested in the hydroisomerization of n-dodecane. Optimum isomer yield was obtained over the Pt/MgAPO-11 catalyst that had neither the highest acidity nor the highest
Pt loading among the tested catalysts. In fact, the activity and the isomer yield both could attain a maximum on 0.5 wt.%
Pt/MgAPO-11 catalysts with differing Mg contents. A lower Mg content resulted in an insufficient acidity, whilst a higher
Mg content weakened the dehydrogenation/hydrogenation function of the Pt. These inappropriate balances between the acidic
and the metallic functions of the catalysts would lead to low activities and isomer yields. On the other hand, the 0.5 wt.%
Pt/MgAPO-11(3) catalyst was found to have a good balance between the acidic and the metallic functions, and thus exhibited
both high activity and isomer yield in comparison with the conventional 0.5 wt.% Pt/SAPO-11 catalyst. |
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Keywords: | Hydroisomerization n-dodecane MgAPO-11 AEL molecular sieves |
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