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Huang L.,Nanjing Southeast University | Huang L.,Nanjing Wolaide Energy Technology Co. | Zhou S.,Nanjing Southeast University | Zhou Y.,Nanjing Southeast University | And 3 more authors.
China Petroleum Processing and Petrochemical Technology | Year: 2012

PtSnSr/HZSM-5 catalysts with different amounts of strontium were prepared by sequential impregnation method, and characterized by BET analysis, TEM, NH3-TPD, H2-TPR, TPO and TG techniques. The results showed that the addition of strontium could modify the characteristics and properties of both acid function and metal function of Pt-Sn-based catalysts. In this case, PtSnSr/HZSM-5 catalyst with an appropriate amount of Sr (1.2%) showed higher catalytic activity and lower amount of coke deposits than PtSn/HZSM-5 catalyst. However, excessive loading of Sr could facilitate the reduction of Sn, which was unfavorable to the reaction. Afterwards, 1.0 m% of Na was added into the PtSnSr(1.2%)/HZSM-5 catalyst to improve the catalytic performance in propane dehydrogenation, and this catalyst displayed the best catalytic performance during our experiments. After having been subjected to reaction for 5 h, the PtSnNa(1.0%)Sr(1.2%)/HZSM-5 catalyst had achieved a higher than 95% selectivity towards propene along with a corresponding propane conversion rate of 32.2%. Source


Huang L.,Nanjing Southeast University | Huang L.,Nanjing Wolaide Energy Technology Co. | Zhou S.,Nanjing Southeast University | Zhou Y.,Nanjing Southeast University | And 3 more authors.
China Petroleum Processing and Petrochemical Technology | Year: 2013

The porous material ATZ with micro-mesopore hierarchical porosity was prepared by alkali treatment of parent HZSM-5 zeolite and applied for propane dehydrogenation. The zeolite samples were characterized by XRD, N 2-physisorption, and NH3-TPD analysis. The results showed that the alkali treatment can modify the physicochemical properties of HZSM-5 zeolite. In this case, the porous material ATZ showed larger external surface area with less acid sites as compared to the HZSM-5 zeolite. It was found out that the alkali treatment of HZSM-5 zeolite could promote the catalytic performance of PtSn/ATZ catalyst. The possible reason was ascribed to the low acidity of ATZ. Furthermore, the presence of mesopores could reduce the carbon deposits on the metallic surface, which was also favorable for the dehydrogenation reaction. Source

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