Hybrid Mo–C_T Nanowires as Highly Efficient Catalysts for Direct Dehydrogenation of Isobutane

Abstract

Direct dehydrogenation of isobutane to isobutene has drawn extensive attention for synthesizing various chemicals. The Mo-based catalysts hold promise as an alternative to the toxic CrO - and scarce Pt-based catalysts. However, the low activity and rapid deactivation of the Mo-based catalysts greatly hinder their practical applications. Herein, we demonstrate a feasible approach toward the development of efficient and non-noble metal dehydrogenation catalysts based on Mo-C hybrid nanowires calcined at different temperatures. In particular, the optimal Mo-C catalyst exhibits isobutane consumption rate of 3.9 mmol g h and isobutene selectivity of 73% with production rate of 2.8 mmol g h. The catalyst maintained 90% of its initial activity after 50 h of reaction. Extensive characterizations reveal that such prominent performance is well correlated with the adsorption abilities of isobutane and isobutene and the formation of η-MoC species. In contrast, the generation of β-MoC crystalline phase during long-term reaction causes minor decline in activity. Compared to MoO and β-MoC, η-MoC plays a role more likely in suppressing the cracking reaction. This work demonstrates a feasible approach toward the development of efficient and non-noble metal dehydrogenation catalysts.

Cu(II)-Based Water-Dispersible Humic Acid: Synthesis, Characterizations, and Antifungal and Growth-Promoting Performances

“…45 The Mo 6+ may be attributed to the unavoidably oxidation for the surface of the MoO 2 in air, which is consistent with previous reports. 33 Additionally, another two peaks at 229.2 and 231.2 eV can be assigned to Mo 2+ 3d 5/2 and Mo 2+ 3d 3/2 , respectively, which may be attributed to molybdenum carbide. 45 Hence, all the above characterization results indicate the hierarchical hollow nanospherical MoO 2 -C-HN catalyst was successfully prepared.…”

“…31 It is of great importance to develop a cost-effective and sustainable nontoxicity catalyst for the solid phase activation of humic acid. 32 Oxides and carbides of molybdenum, a promising non-noble metal catalyst, have been widely applied in dehydrogenation, 33 the hydrogen evolution reaction, 34 and the water−gas shift reaction. 35 The application of oxides and carbides of molybdenum catalyst, especially of 3D structures in the activation of humic acid for improved water solubility, has been rarely reported.…”

Activation of Humic Acid in Lignite Using Molybdate-Phosphorus Hierarchical Hollow Nanosphere Catalyst Oxidation: Molecular Characterization and Rice Seed Germination-Promoting Performances

“…Molybdenum carbide (Mo–C) compounds as a non-noble metal catalyst have showed excellent catalytic performance in different fields owing to their unique physical and chemical properties. , For example, Hu and Vrubel reported a Mo 2 C catalyst with a good catalytic activity in hydrogen evolution reaction . Mu groups reported the application of a Mo–C catalyst in the dehydrogenation of isobutane . Despite the intensive studies on different applications of molybdenum carbide nanomaterial, the effect of Mo–C nanomaterials on the activation of humic acid remains elusive.…”

“…19 Mu groups reported the application of a Mo−C catalyst in the dehydrogenation of isobutane. 20 Despite the intensive studies on different applications of molybdenum carbide nanomaterial, the effect of Mo−C nanomaterials on the activation of humic acid remains elusive. Moreover, these traditional molybdenum carbide nanocrystal hybrid catalysts exhibit remarkable performance in a variety of fields, and they suffer from poor stability, 21,22 which limits their further development and applications.…”

Facile synthesis of ordered mesoporous zinc alumina catalysts and their dehydrogenation behavior

“…[6][7][8] At present, all kinds of metal catalysts, such as vanadiumbased, iron-based, molybdenum-based catalysts, have been widely investigated in this dehydrogenation reaction. [9][10][11][12] In particular, owing to the excellent catalytic performance, Zn based catalysts have been interested and gazed considerably in the direct dehydrogenation of isobutane. For example, Zn modied HZSM-5 materials were found effective for activation of isobutane and high conversion obtained.…”