Opposite effects of self-growth amorphous carbon and carbon nanotubes on the reforming of toluene with Ni/α-Al2O3 for hydrogen production

He, Limo; Hu, Song; Jiang, Long; Syed‐Hassan, Syed Shatir A.; Wang, Lele; Xu, Kai; Xiao, Lingfeng; Su, Sheng; Chen, Xiaofang

doi:10.1016/j.ijhydene.2017.04.230

Cited by 68 publications

(41 citation statements)

References 44 publications

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“…The CO2 evolution profiles for the four catalysts are presented in Figure 11, while Table 1 while those around 610 o C would suggest the formation of filamentous or whisker carbon [71]. The different types of coke deposited on Ni during steam reforming of various compounds have been widely reported [72,73], suggesting amorphous carbon, covering active sites, to result in catalytic activity decrease, while filamentous carbon, diffusing through Ni and leaving active sites still accessible, to not lead to pronounced deactivation [74]. The overall higher amount of coke deposited, particularly of amorphous carbon, on Ni/ZrO2-La2O3 is in agreement with the TOS results where that catalyst was shown to exhibit a relatively higher deactivation compared to Ni/CeO2-ZrO2-La2O3.…”

Section: Temperature-programmed Oxidation Of Spent Catalystsmentioning

confidence: 99%

Elucidation of metal and support effects during ethanol steam reforming over Ni and Rh based catalysts supported on (CeO2)-ZrO2-La2O3

2021

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Section: Temperature-programmed Oxidation Of Spent Catalystsmentioning

confidence: 99%

Elucidation of metal and support effects during ethanol steam reforming over Ni and Rh based catalysts supported on (CeO2)-ZrO2-La2O3

2021

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“…It is generally considered that coke deposition always causes harmful effects on catalytic reactions. The encapsulation of the metal particles and choking of catalyst pores by coke usually lead to the deactivation of catalyst . Different forms of carbons could be observed on Ni surface and evidence exists to show that the formation of certain types of carbon on Ni surface can actually play a positive effect.…”

Section: Introductionmentioning

confidence: 99%

“…The encapsulation of the metal particles and choking of catalyst pores by coke usually lead to the deactivation of catalyst. 16 Different forms of carbons could be observed on Ni surface and evidence exists to show that the formation of certain types of carbon on Ni surface can actually play a positive effect. For example, Souza et al 17 observed that the filamentous carbon formation at different activation conditions could increase the stability and activity of the catalyst during CO 2 reforming of methane.…”

Section: Introductionmentioning

confidence: 99%

Ethanol steam reforming on Ni/CaO catalysts for coproduction of hydrogen and carbon nanotubes

et al. 2019

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Summary Catalytic steam reforming of ethanol is considered as a promising technology for producing H2 in the modern world. In this study, using a fixed‐bed reactor, steam reforming of ethanol was performed for production of carbon nanotubes (CNTs) and H2 simultaneously at 600°C on Ni/CaO catalysts. Commercial CaO and a synthetic CaO prepared using sol‐gel were scrutinized for ethanol's catalytic steam reforming. Analysis results of N2 isothermal adsorption indicate that the CaO synthesized by sol‐gel has more pore volume and surface area in comparison with the commercial CaO. When Ni was loaded, the Ni/CaO catalyst shows an encouraging catalytic property for H2 production, and an increase in Ni loading could improve H2 production. The Ni/CaO catalyst with sol‐gel CaO support has presented a higher hydrogen production and better catalytic stability than the catalysts with the commercial CaO support at low Ni loading. The highest hydrogen yield is 76.8% at Ni loading content of 10% for the Ni/sol‐gel CaO catalyst with WHSV of 3.32/h and S/C ratio of 3. The carbon formed after steam reforming primarily consists of filamentous carbons and amorphous carbons, and CNTs are the predominant type of carbon deposition. The deposited extent of carbon on the used Ni/CaO catalyst lessen upon more Ni loading, and the elongated CNTs are desired to be formed at the surface of the Ni/sol‐gel CaO catalyst. Thus, an efficient process and improved economic value is associated with prompt hydrogen production and CNTs from ethanol steam reforming.

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“…The D band around 1345 cm À 1 which attributed to the amorphous carbon species and G band around 1578 cm À 1 which attributed to the graphitic carbon with a high degree of crystallinity, order, and symmetry are barely observed on the catalyst surface. [23] These results combined with the XRD patterns imply that the deactivation during the reaction process is due to the reduction of active sites caused by grain growth rather than the accumulation of carbon deposits. The X-ray absorption near edge structure spectra were collected to understand the oxidation state of Ni on NiFe/CeO 2 -C1 and NiFe/CeO 2 À S and shown in Figure 6(b).…”

Section: Xps Raman and Xanesmentioning

confidence: 89%

Unveiling the Role of Active Oxygen Species in Oxidative Dehydrogenation of Ethane with CO₂ over NiFe/CeO₂

et al. 2021

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The oxidative dehydrogenation of ethane (ODH) assisted by CO 2 to produce ethylene is inevitably accompanied by the side reaction of dry reforming (DRE) to produce carbon monoxide. However, the key factor determining the dehydrogenation selectivity is still ambiguous. In this paper, four different NiFe/ CeO 2 catalysts were synthesized via an impregnation method over four types of CeO 2 . The dehydrogenation selectivity of the four catalysts ranged from 40 % to 83 %. Temperature-programmed surface reaction and transient response experiments reveal the existence of two types of oxygen species over NiFe/ CeO 2 catalysts. FeO x layers exist as an oxygen species supply buffer over CeO 2 supports. Weakly electrophilic oxygen species supplied by FeO x overlayers could participate in producing C 2 H 4 while strong electrophilic oxygen species supplied by CeO 2 supports could participate in producing CO. The content of weakly electrophilic oxygen species is identified to be a rational descriptor of C 2 H 4 selectivity.

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Opposite effects of self-growth amorphous carbon and carbon nanotubes on the reforming of toluene with Ni/α-Al2O3 for hydrogen production

Cited by 68 publications

References 44 publications

Elucidation of metal and support effects during ethanol steam reforming over Ni and Rh based catalysts supported on (CeO2)-ZrO2-La2O3

Elucidation of metal and support effects during ethanol steam reforming over Ni and Rh based catalysts supported on (CeO2)-ZrO2-La2O3

Ethanol steam reforming on Ni/CaO catalysts for coproduction of hydrogen and carbon nanotubes

Unveiling the Role of Active Oxygen Species in Oxidative Dehydrogenation of Ethane with CO₂ over NiFe/CeO₂

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Opposite effects of self-growth amorphous carbon and carbon nanotubes on the reforming of toluene with Ni/α-Al2O3 for hydrogen production

Cited by 68 publications

References 44 publications

Elucidation of metal and support effects during ethanol steam reforming over Ni and Rh based catalysts supported on (CeO2)-ZrO2-La2O3

Elucidation of metal and support effects during ethanol steam reforming over Ni and Rh based catalysts supported on (CeO2)-ZrO2-La2O3

Ethanol steam reforming on Ni/CaO catalysts for coproduction of hydrogen and carbon nanotubes

Unveiling the Role of Active Oxygen Species in Oxidative Dehydrogenation of Ethane with CO2 over NiFe/CeO2

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Product

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Unveiling the Role of Active Oxygen Species in Oxidative Dehydrogenation of Ethane with CO₂ over NiFe/CeO₂