Hydrogen production by catalytic methane decomposition: Carbon materials as catalysts or catalyst supports

Zhang, Jianbo; Li, Xing; Chen, Huiyong; Qi, Meng; Zhang, Guorong; Hu, Haoquan; Ma, Xiaoxun

doi:10.1016/j.ijhydene.2017.06.197

Cited by 161 publications

(94 citation statements)

References 147 publications

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“…It is well known that carbon deposits generally prevent the contact between reactants and catalyst surfaces and thus stop heterogeneous catalytic reactions 13,15,16 . But, the CH 4 pyrolysis reaction on the surfaces of NPG still proceeded normally even NATURE COMMUNICATIONS | https://doi.org/10.1038/s41467-020-15806-8 ARTICLE when the thicknesses of the amorphous carbon layers exceeded 10 nm ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…H eterogeneous catalysis is a crucial process in industries of chemicals, energy and environmental protection and their related fundamental researches, such as hydrogenation 1-3 , CO oxidation [4][5][6][7][8] , and CH 4 activation and use [9][10][11][12][13][14][15][16] . In its currently increasing development, nanocatalysts [1][2][3]7,[9][10][11][12][13][14][15][16][17][18][19][20] and single-atom catalysts (SACs) 4,8,[21][22][23][24][25][26][27][28] are two different categories of vital heterogeneous catalysts. The two categories have exhibited excellent performances and complementary functions, and their catalytic processes/mechanisms are generally considered to be different from each other 24,25,28 .…”

mentioning

confidence: 99%

“…Among heterogeneous catalysis reactions, the methane (CH 4 ) pyrolysis is a fully green single-step technology for producing nanocarbon and hydrogen (H 2 ), the most environmentally friendly energy carrier [14][15][16] . It is also important for mitigating the environmental challenge associated with CH 4 emission 12,13,15,16 . Meanwhile, Au nanocatalysts and their derived catalysts have exhibited excellent catalytic activities for CH 4 activation and use 9,10,14 .…”

mentioning

confidence: 99%

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Dynamic co-catalysis of Au single atoms and nanoporous Au for methane pyrolysis

Xi¹,

Wang²,

Shen³

et al. 2020

Nat Commun

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Nanocatalysts and single-atom catalysts are both vital for heterogeneous catalysis. They are recognized as two different categories of catalysts. Nevertheless, recent theoretical works have indicated that Au nanoparticles/clusters release Au single atoms in CO oxidation, and they co-catalyze the oxidation. However, to date, neither experimental evidence for the cocatalysis nor direct observations on any heterogeneous catalysis process of single-atom catalysts are reported. Here, the dynamic process of nanoporous Au to catalyze methane pyrolysis is monitored by in situ transmission electron microscopy with high spatial-temporal resolutions. It demonstrates that nanoporous Au surfaces partially disintegrate, releasing Au single atoms. As demonstrated by DFT calculation, the single atoms could co-catalyze the reaction with nanoporous Au. Moreover, the single atoms dynamically aggregate into nanoparticles, which re-disintegrate back to single atoms. This work manifests that under certain conditions, the heterogeneous catalysis processes of nanocatalysts and single-atom catalysts are not independent, where their dynamic co-catalysis exists.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Dynamic co-catalysis of Au single atoms and nanoporous Au for methane pyrolysis

Xi¹,

Wang²,

Shen³

et al. 2020

Nat Commun

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“…Zhang et al studied hydrogen production by carbon materials as catalysts or catalyst supports. They observed the carbon deposits from methane decomposition often had a smaller surface area and less activity than the original carbon catalyst, therein necessitating regeneration in a cyclic process [75]. Yang et al tested the deep regeneration of activated carbon as a catalyst and performed an autothermal analysis for chemical looping methane thermo-catalytic decomposition process [76].…”

Section: Co2 Gasification Of Tcd Carbonmentioning

confidence: 99%

Carbons as Catalysts in Thermo-Catalytic Hydrocarbon Decomposition: A Review

Wal

Nkiawete

2020

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Thermo-catalytic decomposition is well-suited for the generation of hydrogen from natural gas. In a decarbonization process for fossil fuel—pre-combustion—solid carbon is produced, with potential commercial uses including energy storage. Metal catalysts have the disadvantages of coking and deactivation, whereas carbon materials as catalysts offer resistance to deactivation and poisoning. Many forms of carbon have been tested with varied characterization techniques providing insights into the catalyzed carbon deposition. The breadth of studies testing carbon materials motivated this review. Thermocatalytic decomposition (TCD) rates and active duration vary widely across carbons tested. Regeneration remains rarely investigated but does appear necessary in a cyclic TCD–partial oxidation sequence. Presently, studies making fundamental connections between active sites and deposit nanostructures are few.

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“…Despite significant progresses have been made in preparation and applications of carbon-based catalysts, however, there are still some important issues that have yet to be addressed. For example, nanocarbon catalysts with high performance are highly desired and remain a great challenge, and affordable methods for synthesis, industrial scalability, and economic viability are needed as well [2].…”

Section: /2mentioning

confidence: 99%