Nature of the Active Sites of VOx/Al2O3 Catalysts for Propane Dehydrogenation,ACS Catalysis

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Nature of the Active Sites of VOx/Al2O3 Catalysts for Propane Dehydrogenation
ACS Catalysis ( IF 11.3 ) Pub Date : 2016-07-11 00:00:00 , DOI: 10.1021/acscatal.6b00893
Gang Liu ₁ , Zhi-Jian Zhao ₁ , Tengfang Wu ₁ , Liang Zeng ₁ , Jinlong Gong ₁

Affiliation

Supported VO_x catalysts are promising for use in propane dehydrogenation (PDH) because of the relatively superior activity and stable performance upon regeneration. However, the nature of the active sites and reaction mechanism during PDH over VO_x-based catalysts remains elusive. We examined active species by attaining various fractions of V⁵⁺, V⁴⁺, and V³⁺ ions by adjusting the surface vanadium density on an alumina support. The results reveal a close relationship between TOF and the fraction of V³⁺ ion, indicating that V³⁺ was more active for PDH. In situ diffuse reflectance infrared Fourier transform spectroscopy showed the same strong adsorbed species during both propane dehydrogenation and propylene hydrogenation. The results indicated that such an intermediate may correspond to V species containing a C═C bond, i.e., V–C₃H₅, and a reaction mechanism was proposed accordingly.

中文翻译：

丙烷脱氢用VO _x / Al ₂ O ₃催化剂活性部位的性质

负载的VO _x催化剂因其相对优越的活性和再生后的稳定性能，有望用于丙烷脱氢（PDH）。但是，在基于VO _x的催化剂上进行PDH期间，活性位点的性质和反应机理仍然难以捉摸。我们通过调节氧化铝载体上的表面钒密度，通过获得V ⁵⁺，V ⁴⁺和V ³⁺离子的各个部分来检查活性物质。结果表明，TOF与V ³⁺离子含量之间存在密切关系，表明V ³⁺对PDH的活性更高。原位漫反射红外傅里叶变换光谱在丙烷脱氢和丙烯加氢过程中显示出相同的强吸附物质。结果表明，这种中间体可能对应于具有C═C键的V物种，即V–C ₃ H ₅，并据此提出了反应机理。

更新日期：2016-07-11

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