Oxidative Dehydrogenation of Propane over MoOx and POx Supported on Carbon Nanotube Catalysts

Bai, Zhenwei; Liu, Liping; Xiong, Guang

doi:10.1002/cctc.201100242

Cited by 17 publications

(6 citation statements)

References 34 publications

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“…Their high costs when used as bulks bring them to the field of nanoparticle (NP) science, generally applied as metallic NP on top of a substrate or support [ 15 , 16 , 17 , 18 , 19 ]. Since these metals are dispersed as metallic NPs on a support, their chemical activity increases using a considerable small amount of metal.…”

Section: Introductionmentioning

confidence: 99%

A high-throughput analytical tool for quantification of 15 metallic nanoparticles supported on carbon black

Souza

Paniz

Pedron

et al. 2019

Heliyon

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Metallic nanoparticles (NPs) have been widely used in different areas of science. Usually, they are immobilized on a low-cost support for catalysis purposes. However, there is a lack of studies for specific methods for analytical quantification since the extraction of these metallic NPs from the matrix is still a challenge. In this work, 15 metallic NPs were synthesized (Pt, Pd, Au, Ag, Rh, Ru, Nb, Mn, Co, Cu, Zr, Sn, Ce, Ni and W) supported on a commercial carbon black (Vulcan XC72). Then, six different methods were employed for sample preparation and further determination by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The results can be divided in three groups concerning the extraction of metallic NPs: the first group could be extracted from the matrix with nitric acid, for the second one it was necessary to employ a digestion at 25 °C (room temperature), and finally a third group which was found to be independent of acid and temperature. These findings can contribute to future research in the field of catalysis to improve their characterization regarding the metallic NPs.

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Section: Introductionmentioning

confidence: 99%

A high-throughput analytical tool for quantification of 15 metallic nanoparticles supported on carbon black

Souza

Paniz

Pedron

et al. 2019

Heliyon

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“…Mo is earth abundant and has a similar electronic structure to Cr. Oxides, carbides, and nitrides of molybdenum have thus been widely utilized in catalytic applications, which but are not limited to alkene isomerization, hydrogenation, hydrogenolysis, and hydrodesulfurization. − In contrast, as a candidate for catalytic dehydrogenation, Mo-based catalyst has been mainly studied in oxidative dehydrogenation of ethane, − propane, − and n -butane in previous studies. , For example, the catalytic performances of molybdenum oxides, including MoO 3 crystallites, MoO x monomers, or polymers, are typically affected by the supporting species, the molybdenum oxidation state, and the dispersion of the metals. Wang and co-workers showed that the Mo/MgAl 2 O 4 catalyst can achieve ca.…”

Section: Introductionmentioning

confidence: 99%

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

Shi

et al. 2018

ACS Appl. Mater. Interfaces

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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.

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“…Corma − and Katz have shown that the catalytic perfοrmance of delaminated zeolites is different from that of the same zeolite prior to delamination. Doped MoS 2 , which is used as a catalyst in the oil industry, also seems to be a two-dimensional system whose activity is mainly at the border of the platelets. − It has been shown that submonolayers of molybdenum oxide supported on another oxide are better catalysts for methanol oxidation − or oxidative dehydrogenation of propane ,− than MoO 3 powder. The catalytic activity deteriorates when more than a monolayer of molybdenum oxide is added to the support.…”

Section: Introductionmentioning

confidence: 99%

“…Doped MoS2, which is used as a catalyst in the oil industry, also seems to be a two-dimensional system whose activity is mainly at the border of the platelets. [17][18][19] It has been shown that submonolayers of molybdenum oxide supported on another oxide are better catalysts for methanol oxidation [20][21][22][23][24][25][26][27][28][29][30] or oxidative dehydrogenation of propane 23,[31][32][33][34][35] than MoO3 powder.…”

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confidence: 99%

Oxygen Vacancy Formation on α-MoO₃ Slabs and Ribbons

Agarwal

Metiu

2016

J. Phys. Chem. C

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MoO3 is a versatile catalyst for oxidation reactions that consists of bilayers connected by van der Waals interaction. In principle a MoO3 nanocrystal can be exfoliated to create twodimensional ribbons. For this article, we study the difference between the chemistry of slabs having a variety of crystal faces and that of the edges of ribbons cut from a two-dimensional bilayer. As a descriptor of chemical reactivity we use the energy of oxygen-vacancy formation: the easier it is to form an oxygen vacancy, the better oxidant the face of a slab or the edge of a two-dimensional ribbon is. We find that the properties of ribbon edges are different from those of the corresponding slab surfaces. The surface energies of slabs are in the order (010)s < (100)s < (101)s < (001)s, whereas the edge energies of ribbons are in the order <100>r ~ <101>r < <001>r (the subscript s indicates a slab and r, a ribbon). Among the surfaces studied, we have found that (001)s and (101)s faces have the lowest oxygen-vacancy formation energies, and (010)s has the highest. In contrast, among the edges studied, <101>r has the lowest vacancy formation energies. Our calculations suggest that no benefit is obtained by creating <100>r or <001>r ribbon edges. However, a significant decrease of oxygen-vacancy formation energies is observed on formation of <101>r edge by exfoliating (101)s slabs. Also, among the structures studied, we found <101>r edges to be the most reactive and (010)s surfaces to be the least reactive.

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Oxidative Dehydrogenation of Propane over MoO_x and PO_x Supported on Carbon Nanotube Catalysts

Cited by 17 publications

References 34 publications

A high-throughput analytical tool for quantification of 15 metallic nanoparticles supported on carbon black

A high-throughput analytical tool for quantification of 15 metallic nanoparticles supported on carbon black

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

Oxygen Vacancy Formation on α-MoO₃ Slabs and Ribbons

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Oxidative Dehydrogenation of Propane over MoOx and POx Supported on Carbon Nanotube Catalysts

Cited by 17 publications

References 34 publications

A high-throughput analytical tool for quantification of 15 metallic nanoparticles supported on carbon black

A high-throughput analytical tool for quantification of 15 metallic nanoparticles supported on carbon black

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

Oxygen Vacancy Formation on α-MoO3 Slabs and Ribbons

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Product

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Oxidative Dehydrogenation of Propane over MoO_x and PO_x Supported on Carbon Nanotube Catalysts

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

Oxygen Vacancy Formation on α-MoO₃ Slabs and Ribbons