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

Quan, Cui; Gao, Ningbo; Wang, Huihui; Sun, Hongman; Wu, Chunfei; Wang, Xinxin; Ma, Zhe

doi:10.1002/er.4365

Cited by 32 publications

(23 citation statements)

References 31 publications

(76 reference statements)

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“…However, biomass is considered as a promising renewable energy source. 8,9 Furthermore, activated carbon can be prepared from various feedstocks, including coal, blue-coke, and organic materials. 2,3 Activated carbon is carbonaceous material containing developed internal pore structure with high specific surface area.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

2019

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Activated carbon is a promising material that has a broad application prospect.In this work, biomass (tea seed shell) was used to prepare activated carbon with KOH activation (referred to as AC), and nitrogen was doped in activated carbon using melamine as the nitrogen source (referred to as NAC-x, where x is the mass ratio of melamine and activated carbon). The obtained activated biomass carbon (activated bio-carbon) samples were characterized by Brunauer-Emmett-Teller (BET)-specific surface area analysis, ultimate analysis, X-ray photoelectron spectroscopy (XPS) analysis, Raman spectrum analysis, and X-ray diffraction (XRD) patterns. The specific surface areas of activated bio-carbons were 1503.20 m 2 /g (AC), 1064.54 m 2 /g (NAC-1), 1187.93 m 2 /g (NAC-2), 1055.32 m 2 /g (NAC-3), and 706.22 m 2 /g (NAC-4), revealing that nitrogen-doping process leads to decrease in specific surface area. XPS analysis revealed that the main nitrogen-containing functional groups were pyrrolic-N and pyridinic-N. The capacity of CO 2 capture and electrochemical performance of activated bio-carbon samples were investigated. The CO 2 capturing capacity followed this order: AC (3.15 mmol/g) > NAC-2 (2.75 mmol/g) > NAC-1 (2.69 mmol/g) > NAC-3 (2.44 mmol/g) > NAC-4 (1.95 mmol/g) at 298 K at 1 bar, which is consistent with the order of specific surface area. The specific surface area played a dominant role in CO 2 capturing capacity. As for supercapacitor, AC-4 showed the highest specific capacitance (168 F/g) at the current density of 0.5 A/g, but NAC-2 showed the best electrochemical performance (89 F/g) at 2 A/g. Nitrogen-containing functional groups and specific surface area both had an important impact on electrochemical performance. In general, NAC-3 and NAC-2 produced excellent electrochemical performance. Compared with NAC-3, less melamine was used to prepare NAC-2; therefore, NAC-2 was considered as the best activated bio-carbon for supercapacitor for 141 F/g (at 0.5 A/g), 108 F/g (at 1 A/g), and 89 F/g (at 2 A/g) in this work.

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Section: Introductionmentioning

confidence: 99%

“…[5][6][7] And it can be applied as catalyst support. 8,9 Furthermore, activated carbon can be prepared from various feedstocks, including coal, blue-coke, and organic materials. [10][11][12] Biomass is an ideal feedstock to prepare high specific surface area activated carbon.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

2019

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“…The second oxidation peaks appeared at about 500°C is related to oxidation of filamentous carbons such as carbon nanotubes (CNTs) and the result is consistent with SEM image in Figure C, D. Compared with Ni/AB‐2 catalyst, the mass loss of Ni‐Ce/AB‐2 catalyst during before and after reaction is less than fresh Ni‐Ce/AB‐2 catalyst, which indicated that the addition of Ce can reduce the generation of amorphous carbon during the reaction and promote the formation of filamentous carbon. It is reported that amorphous carbons are prone to encapsulate active catalytic sites, resulting in the deactivation of catalyst . The reduction of amorphous carbon deposition is beneficial to the improvement of catalytic activity.…”

Section: Resultsmentioning

confidence: 99%

“…Reforming gaseous products were measured by an infrared syngas analyzer (ETG, Italy) which could detect the gas concentration (vol%) of H 2 , CO, CO 2 , CH 4 , N 2 online with a sampling interval of 1 second. The detailed calculation method for the molar flow of the produced gas (mmol/min) has been presented in our previous work …”

Section: Methodsmentioning

confidence: 99%

Development of activated biochar supported Ni catalyst for enhancing toluene steam reforming

2020

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Catalytic steam reforming of tar is considered to be an attractive pathway for tar removal and H 2 production in the modern world. In this study, activation of biochar (B) from pine wood pyrolysis was performed to boost its specific surface area and pore structure. The activated biochar (AB) was used as a catalyst support with the aim to enhance the catalytic activity. The catalytic reforming performance of toluene over Ni/AB catalyst was investigated, and the catalytic behavior of Ni/AB catalysts was compared with Ni/Al 2 O 3 and Ni/B. The effect of potassium hydroxide (KOH) to biochar ratio, Ni loading, reforming temperature, weight hourly space velocity and steam to carbon ratio(S/C) on the performance of Ni/AB catalysts were studied. The results showed that Ni/AB catalysts exhibited a superior catalytic activity for carbon conversion and H 2 production to Ni/B and Ni/Al 2 O 3 catalysts. In addition, high carbon conversion (86.2%) and H 2 production (64.3%) can be achieved with Ni/AB catalyst under the optimal operating conditions. Furthermore, in order to improve the stability of the Ni/AB catalyst, Ce was introduced to Ni/AB catalyst. According to stability tests, the H 2 concentration of Ni-Ce/AB catalysts was still higher than 2.24 mmol/min even after 20 hours reaction.

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“…Nowadays, hydrogen as energy carrier is the most attractive because of its high calorific value and zero pollution. 1 Hydrocarbon and its derivatives, such as methane/natural gas [2][3][4][5][6] and alcohol/organic acid [7][8][9][10][11][12][13] steam reforming has been employed for hydrogen production for the high conversion efficiency of this process. Long-chain hydrocarbon fuels, [14][15][16][17] such as ndodecane, have widely used as hydrogen source since their high density, high hydrogen yield and good transportability.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the preparation of Ni‐Ce‐Pr catalysts for efficient hydrogen production by n ‐dodecane steam reforming

et al. 2019

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Summary Nowadays, the development of fuel cell is getting more and more inseparable from the production of hydrogen. Long‐chain hydrocarbons steam reforming is a feasible way for hydrogen supply. Herein, various nickel‐ceria‐praseodymium (Ni‐Ce‐Pr) catalysts have been prepared by a sol‐gel method. Multiple parameters during catalyst preparation, including the amount of Ni, the content of doped Pr and the calcination temperature, were systematically studied for tuning the catalytic performance for n‐dodecane steam reforming in a fixed‐bed reactor under 15 mL/gcat·h at 600°C and water‐to‐carbon molar ratio of 2 at 0.1 MPa. Reaction data showed that both the amount of Ni and the content of doped Pr will greatly affect the n‐dodecane conversion and hydrogen production. Additionally, the calcination temperature during catalyst preparation showed a big influence on its performance for n‐dodecane steam reforming. After optimization, 10Ni‐CePr2‐600 exhibits the highest activity and stability for n‐dodecane steam reforming, accompanying with the lowest rate of coke deposition (0.015 gc/gcat·h). The structure and oxygen vacancy of the catalyst was characterized by H2‐TPR, Raman, and X‐ray photoelectron spectroscopy (XPS). The superior activity and stability of 10Ni‐CePr2‐600 are ascribed to the strong interaction between NiO and support along with abundant oxygen vacancies in the Pr‐doped ceria.

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

Cited by 32 publications

References 31 publications

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Development of activated biochar supported Ni catalyst for enhancing toluene steam reforming

Optimizing the preparation of Ni‐Ce‐Pr catalysts for efficient hydrogen production by n ‐dodecane steam reforming

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

Cited by 32 publications

References 31 publications

Nitrogen‐doping activated biomass carbon from tea seed shell for CO 2 capture and supercapacitor

Nitrogen‐doping activated biomass carbon from tea seed shell for CO 2 capture and supercapacitor

Development of activated biochar supported Ni catalyst for enhancing toluene steam reforming

Optimizing the preparation of Ni‐Ce‐Pr catalysts for efficient hydrogen production by n ‐dodecane steam reforming

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Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor

Nitrogen‐doping activated biomass carbon from tea seed shell for CO ₂ capture and supercapacitor