Nitrogen-doped carbon nanotubes as efficient catalysts for isobutane dehydrogenation

Mu, Jiali; Liu, Baoan; Shi, Junjun; Long, Jinxing; Lv, LuFeng; Li, Xuehui

doi:10.1039/c6cy02314b

Cited by 19 publications

(7 citation statements)

References 48 publications

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“…The direct dehydrogenation of isobutane was conducted according to our reported method with modification. 34 Typically, 200 mg of catalyst was fixed on quartz-wool plugs in a conventional fixed-bed quartz tubular reactor of 8 mm inner diameter. The reaction temperature was set at 600 °C.…”

Section: ■ Materials and Methodsmentioning

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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Section: ■ Materials and Methodsmentioning

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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“…In the C1s spectrum of N-SWCNTs-50 (Figure 2k), the peaks at 284.8, 285.1, 286.8 and 289 eV correspond to CC/CC, CO/CN, CO, and COC bonds, respectively. [34,35] Deconvolution of the N1s fine spectra leads to four types of nitrogenous substances: pyridine N (N-6, 398.1 eV), pyrrole N (N-5, 399.8 eV), quaternary N (N-Q, 400.8 eV) and pyridine-N-oxide (N-X, 402.5 eV) (Figure 2l). [34,36] It is previously indicated that N-5 and N-6 located at the edge of the carbon chain backbone can provide a certain pseudo-capacitance for supercapacitors.…”

Section: Resultsmentioning

confidence: 99%

Floating Catalyst Chemical Vapor Deposition Patterning Nitrogen‐Doped Single‐Walled Carbon Nanotubes for Shape Tailorable and Flexible Micro‐Supercapacitors

Dong

Zhang

Liao

et al. 2023

Adv Funct Materials

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Micro-supercapacitors (MSCs) as high-power density energy storage units are designed to meet the booming development of flexible electronics, requiring simple and fast fabrication technology. Herein, a fast and direct solvent-free patterning method is reported to fabricate shape-tailorable and flexible MSCs by floating catalyst chemical vapor deposition (FCCVD). The nitrogen-doped single-walled carbon nanotubes (N-SWCNTs) are directly deposited on a patterned filter by FCCVD with designable patterns and facilely dry-transferred on versatile substrates. The obtained MSCs deliver an excellent areal capacitance of 3.6 mF cm −2 and volumetric capacitance of 98.6 F cm −3 at a scan rate of 5 mV s −1 along with excellent long-term cycle stability over 125 000 circles. Furthermore, the MSCs show good performance uniformity, which can be readily integrated via connection in parallel or series to deliver a stable high voltage (4 V with five serially connected devices) and large capacitance (5.1 mF with five parallel devices) at a scan rate of 100 mV s −1 , enabling powering the light emitting displays. Therefore, this method blazes the trail of directly preparing flexible, shape-customizable, and high-performance MSCs.

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“…The observed differences in product selectivity between the samples could be related to nitrogen‐containing groups, since the initial propylene selectivity decreases with increasing nitrogen content in all samples (Figure S9). Although the role of nitrogen functionalities in cracking reactions is not well understood, reduced selectivity due to cracking was previously reported over nitrogen‐doped carbons in the dehydrogenation of isobutane [25] …”

Section: Resultsmentioning

confidence: 99%

Impact of Heteroatom Speciation on the Activity and Stability of Carbon‐Based Catalysts for Propane Dehydrogenation

et al. 2021

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Metal‐free carbon catalysts represent attractive alternatives to platinum and chromium‐containing systems for the on‐purpose production of propylene, a crucial chemical building block, via non‐oxidative propane dehydrogenation. However, the role of heteroatoms in determining reactivity and stability is poorly understood. Here, the study of a platform of polyaniline‐derived and activated carbons, with distinct porous properties, and heteroatom type, content, and speciation, enables establishing improved structure‐performance relationships. In‐depth characterization reveals that, while several oxygen species potentially catalyze the reaction, carbonyl groups are the main functionality governing the activity. Oxygen loss via propane‐driven water evolution is the main deactivation path. Six‐fold enhanced stability evidenced over carbon catalysts derived from KOH‐post‐treated polyanilines demonstrates the importance of controlling the nanostructure for enhancing longevity.

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Nitrogen-doped carbon nanotubes as efficient catalysts for isobutane dehydrogenation

Abstract: Large-scale production of isobutene from isobutane requires high-performance and cost-effective catalysts.

Cited by 19 publications

References 48 publications

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

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

Floating Catalyst Chemical Vapor Deposition Patterning Nitrogen‐Doped Single‐Walled Carbon Nanotubes for Shape Tailorable and Flexible Micro‐Supercapacitors

Impact of Heteroatom Speciation on the Activity and Stability of Carbon‐Based Catalysts for Propane Dehydrogenation

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Nitrogen-doped carbon nanotubes as efficient catalysts for isobutane dehydrogenation

Abstract: Large-scale production of isobutene from isobutane requires high-performance and cost-effective catalysts.

Cited by 19 publications

References 48 publications

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

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

Floating Catalyst Chemical Vapor Deposition Patterning Nitrogen‐Doped Single‐Walled Carbon Nanotubes for Shape Tailorable and Flexible Micro‐Supercapacitors

Impact of Heteroatom Speciation on the Activity and Stability of Carbon‐Based Catalysts for Propane Dehydrogenation

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

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