CO x -free hydrogen production from ammonia decomposition over sepiolite-supported nickel catalysts

Kurtoğlu, Samira Fatma; Sarp, Seda; Akkaya, Ceren Yılmaz; Yağci, B.; Motallebzadeh, Amir; Soyer-Uzun, Sezen; Uzun, Alper

doi:10.1016/j.ijhydene.2018.04.057

Cited by 47 publications

(14 citation statements)

References 58 publications

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“…273 In contrast, sepiolite (an abundant Si and Mg mineral) has demonstrated good catalytic results as a Ni support for the decomposition of ammonia. 274 Other types of compounds tested as supports for Ni are zirconium-based supports. For instance, Henpraserttae et al 275 tested the use of ZrO 2 as dopant for an alumina support, obtaining an increase in ammonia conversion of 11% at 500 °C compared to the catalyst supported only on alumina.…”

Section: Catalysts For the Thermal Decomposition Of Ammoniamentioning

confidence: 99%

See 1 more Smart Citation

Review of the Decomposition of Ammonia to Generate Hydrogen

Lucentini

Garcia

Vendrell

et al. 2021

Ind. Eng. Chem. Res.

301

193

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Because of the problems associated with the generation and storage of hydrogen in portable applications, the use of ammonia has been proposed for on-site production of hydrogen through ammonia decomposition. First, an analysis of the existing systems for ammonia decomposition and the challenges for this technology are presented. Then, the state of the art of the catalysts used to date for ammonia decomposition is described considering the catalysts composed of noble and non-noble metals and their combinations, as well as novel materials such as alkali metal amides and imides. The effect of the supports and promoters used is analyzed in detail, and the catalytic activity obtained is compared. An analysis of the kinetics of the reaction obtained with different catalysts is also presented and discussed, including the reaction mechanism, the determining step of the reaction, and the apparent activation energy. Finally, the structured reactors used to date for the decomposition reaction of ammonia are explored, as well as the possibilities offered by catalytic membrane reactors, which allow the on-site simultaneous production and separation of hydrogen.

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Section: Catalysts For the Thermal Decomposition Of Ammoniamentioning

confidence: 99%

“…At parity of Ni content, the Ni/SiO 2 catalyst showed superior activity and stability . In contrast, sepiolite (an abundant Si and Mg mineral) has demonstrated good catalytic results as a Ni support for the decomposition of ammonia …”

Section: Catalysts For the Thermal Decomposition Of Ammoniamentioning

confidence: 99%

Review of the Decomposition of Ammonia to Generate Hydrogen

Lucentini

Garcia

Vendrell

et al. 2021

Ind. Eng. Chem. Res.

301

193

View full text Add to dashboard Cite

show abstract

“…Peaks observed in Fig. 1 in the range of 2θ = 21° and 26 indicate the presence of the quartz SiO2 phase (Kurtoğlu et al, 2018). In addition, the peaks observed at 2θ=35 and 67° in both samples also represent SiO2 (Xie et al, 2017), (Shi et al, 2017), (Lu et al, 2015) and 2θ = 37, 43, 63, 75 and 80° peaks are interpreted as NiO (Daroughegi Mofrad, Rezaei, & Hayati-Ashtiani, 2019; Dong et al, 2020;Graça et al, 2014;Jiang, Huang, Dong, Qin, & Ji, 2018;Quindimil, De-La-Torre, Pereda-Ayo, González-Marcos, & González-Velasco, 2018).…”

Section: Characterization Resultsmentioning

confidence: 91%

CO2 Methanation Over Ni-Sepiolite Catalysts

Yarbaş¹,

Ayas²

2021

European Journal of Science and Technology

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“…To evaluate the catalytic activity and stability of the developed catalyst (20 h-L) compared with other Ni-based catalysts reported in the literature, ,, both the testing conditions and the results of different catalysts with similar AD reaction conditions are listed in Table . Due to the intrinsic nature of the as-developed Ni-structured catalysts, which have exposed active sites only on the surface, the hydrogen generation rates are expressed in two ways with different units (mmol H2 g cat –1 min –1 and mol H2 mol Ni –1 h –1 ) for a fair comparison.…”

Section: Resultsmentioning

confidence: 99%

Top-Down Syntheses of Nickel-Based Structured Catalysts for Hydrogen Production from Ammonia

Lee

Cha

Kwak

et al. 2020

ACS Appl. Mater. Interfaces

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We report the fabrication and catalytic performance evaluation of highly active and stable nickel (Ni)-based structured catalysts for ammonia dehydrogenation with nearly complete conversion using nonprecious metal catalysts. Lowtemperature chemical alloying (LTCA) followed by selective aluminum (Al) dealloying was utilized to synthesize foam-type structured catalysts ready for implementation in commercial-scale catalytic reactors. The crystalline phases of Ni−Al alloy (NiAl 3 , Ni 2 Al 3 , or both) in the near-surface layer were controlled by tuning the alloying time. The best-performing catalyst was obtained from a Ni foam substrate with a NiAl 3 /Ni 2 Al 3 overlayer synthesized by LTCA at 400 °C for 20 h. The developed Ni catalyst exhibited an activity enhancement of 10-fold over the nontreated Ni foam and showed outstanding activities of 15 800 mol H2 mol Ni −1h −1 (TOF: 4.39 s −1 ) and 19 978 mol H2 mol Ni −1 h −1 (TOF: 5.55 s −1 ) at 550 and 600 °C, respectively. This performance is unprecedented compared with previously reported Ni-based ammonia cracking catalysts with higher-end performance (TOFs of 0.08−1.45 s −1 at 550 °C). Moreover, this catalyst showed excellent stability for 100 h at 600 °C while discharging an extremely low NH 3 concentration of 1034 ppm. The NH 3 concentration in the exhaust gas was further reduced to 690 and 271 ppm at 700 and 800 °C, respectively, while no deactivation was observed at these elevated temperatures. Through material characterizations, we clarified that controlling the degree of Al alloying in the outermost layer of Ni is a crucial factor in determining the activity and stability because residual Al possibly modifies the electronic structure of Ni for enhanced activity as well as transforming to acidic alumina for increased intrinsic activity and stability.

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CO x -free hydrogen production from ammonia decomposition over sepiolite-supported nickel catalysts

Cited by 47 publications

References 58 publications

Review of the Decomposition of Ammonia to Generate Hydrogen

Review of the Decomposition of Ammonia to Generate Hydrogen

CO2 Methanation Over Ni-Sepiolite Catalysts

Top-Down Syntheses of Nickel-Based Structured Catalysts for Hydrogen Production from Ammonia

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