Citation: XUE Meng-Wei, ZHOU Yu-Ming, ZHANG Yi-Wei, HUANG Li, LIU Xuan, DUAN Yong-Zheng. Effects of Mg Addition on Catalytic Performance of PtNa/Sn-ZSM-5 in Propane Dehydrogenation[J]. Acta Physico-Chimica Sinica, ;2012, 28(04): 928-934. doi: 10.3866/PKU.WHXB201202073 shu

Effects of Mg Addition on Catalytic Performance of PtNa/Sn-ZSM-5 in Propane Dehydrogenation

1.
1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China;
2. School of Biochemical and Environmental Engineering, Nanjing Xiaozhuang University, Nanjing 211171, P. R. China

Received Date: 25 November 2011
Available Online: 7 February 2012
Fund Project: 国家自然科学基金(50873026, 21106017) (50873026, 21106017) 江苏省产学研前瞻性联合研究项目(BY2009153) (BY2009153)高等学校博士学科点专项科研基金(20100092120047)资助 (20100092120047)

The effects of Mg addition on the catalytic performance of PtNa/Sn-ZSM-5 in propane dehydrogenation was investigated using catalytic reaction performance tests and physicochemical characterizations such as X-ray diffraction (XRD), nitrogen adsorption, transmission electron microscopy (TEM), NH₃ temperature-programmed desorption (NH₃-TPD), H₂ temperature-programmed reduction (H₂-TPR), and O₂ temperature-programmed oxidation (O₂-TPO). It was found that addition of appropriate amounts of Mg (0.3% and 0.5%, mass fraction) promoted the dispersion of metallic particles and decreased carbon deposition. In these cases, the presence of Mg in the PtMgNa/Sn-ZSM-5 catalyst could inhibit reduction of Sn species, thus more Sn could exist in oxidized states, which is advantageous to the reaction. However, when the content of Mg was excessive, the metallic particles were not well distributed and the particles agglomerated more easily. Moreover, the reduction of Sn species at high temperatures is relatively easy, which is disadvantageous to the reaction. In our experiments, the addition of 0.5% Mg to the PtNa/Sn-ZSM-5 catalyst gave the best catalytic performance. After reaction for 7 h, higher than 95% selectivity toward propene was achieved with a corresponding propane conversion value of 38.7%.
- Mg,
- Sn-ZSM-5,
- Propane dehydrogenation,
- Catalytic performance,
- Catalyst
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