Preparation of MoVTe(Sb)Nb mixed oxide catalysts using a slurry method for selective oxidative dehydrogenation of ethane |
| |
Authors: | Qi Xie Luqian Chen Weizheng Weng Huilin Wan |
| |
Affiliation: | State Key Laboratory for Physical Chemistry of the Solid Surfaces, Department of Chemistry and Institute of Physical Chemistry, Xiamen University, Xiamen 361005, PR China |
| |
Abstract: | The preparation of bulk MoVTe(Sb)Nb mixed oxide catalysts using a traditional slurry method, results in highly active catalysts for oxidative dehydrogenation of ethane to ethene. Several major phases including orthorhombic M1, hexagonal M2 or MoxM1−xO2.8 (M = V or Nb) have been detected in the catalysts from characterization results such as X-ray diffraction (XRD), SEM and EDX analyses. Ethane conversion and yield to ethene increase with increasing content of the M1 phase in the catalysts. The maximum yield of ethene (ca. 87% selectivity and ca. 90% conversion, STYC2H4 of 176 g h−1) has been obtained with a MoV0.31Te0.2Nb0.14 mixed oxide catalyst, calcined at 873 K under nitrogen, containing almost pure orthorhombic M1 phase and small amounts of unidentified impurity phases, operating at a relatively low reaction temperature of 673 K. The orthorhombic M1 phase has been shown to be the most active in ethane activation and the most selective for ethene formation. The hexagonal M2 phase is relatively inactive in ethane activation and less selective for ethene formation. The Te-free phases such as Sb4Mo10O31 and MoxM1−xO2.8 (M = V or Nb) show the lowest selectivity to ethene. |
| |
Keywords: | Ethene MoVTe(Sb)Nb mixed oxide catalyst Selective oxidation of ethane Slurry method ODHE |
本文献已被 ScienceDirect 等数据库收录! |
|