Kinetics of hydrogen iodide decomposition over activated carbon catalysts in pellets

Favuzza, P.; Felici, C.; Nardi, Luca; Tarquini, P.; Tito, Amélia

doi:10.1016/j.apcatb.2011.03.032

Cited by 50 publications

(15 citation statements)

References 35 publications

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“…For lower activation energies, the reaction can be faster at a given temperature. These activation energies are in good agreement with the literature values …”

Section: Resultssupporting

confidence: 92%

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Performance of Activated‐Carbon‐Supported Ni, Co, and Ni–Co Catalysts for Hydrogen Iodide Decomposition in a Thermochemical Water‐Splitting Sulfur–Iodine Cycle

Singhania

Bhaskarwar

2018

Energy Tech

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Bimetallic Ni–Co/activated carbon (Ni–Co/AC) and monometallic Ni/AC and Co/AC catalysts were prepared to investigate their catalytic activity for hydrogen‐iodide decomposition in the sulfur–iodine (SI) cycle. Transmission electron microscopy (TEM) revealed an average size of approximately 3 nm particles for Ni–Co/AC. Ni–Co/AC possesses a higher ID/IG intensity ratio in Raman spectroscopy than the monometallic catalysts and support, which is an indication of high degree of defects. Hydrogen‐iodide decomposition was performed on a fixed vertical bed quartz reactor at a weight hourly space velocity (WHSV) of 12.9 h−1 and different temperatures (400–550 °C). Bimetallic catalysts exhibited better activity and stability than the monometallic catalysts. The composition of Ni/Co in the bimetallic Ni–Co catalyst played the key role in dictating the activity of catalyst. It was observed that the loading ratio of 3:1 for Ni/Co achieved the maximal hydrogen‐iodide conversion value. Bimetallic Ni(3 %)–Co(1 %)/AC showed excellent time‐on‐stream stability of 70 h for the hydrogen‐iodide decomposition reaction. The post‐reaction characterization studies (X‐ray diffraction and Brunauer–Emmett–Teller surface area measurements) confirmed that the bimetallic Ni–Co/AC catalyst has a stable structure and shows high corrosion resistance against the corrosive hydrogen iodide environment. Also, it was observed that the apparent activation energy of the bimetallic Ni–Co/AC catalyst was smaller than the monometallic Ni and Co catalysts. The effect of iodine on hydrogen‐iodide conversion was also studied.

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“…For lower activation energies, the reaction can be faster at a given temperature. These activation energies are in good agreement with the literature values …”

Section: Resultssupporting

confidence: 92%

“…reported AC‐supported Pt catalysts as highly active catalysts in their Review. Favuzza et al . showed a high time‐on‐stream stability of AC for 100 h for hydrogen iodide decomposition.…”

Section: Introductionmentioning

confidence: 99%

Performance of Activated‐Carbon‐Supported Ni, Co, and Ni–Co Catalysts for Hydrogen Iodide Decomposition in a Thermochemical Water‐Splitting Sulfur–Iodine Cycle

Singhania

Bhaskarwar

2018

Energy Tech

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“…Berndhä user et al [17] compared the calculated homogeneous gas phase reaction results with direct HI decomposition from H 2 OeHIeI 2 solutions, and found that the velocity of the direct HI decomposition is some orders of magnitude higher than the gas phase reaction. Favuzza et al [18] compared the decomposition rates of pure HI and liquid HIeH 2 O solution under the same reactor pressure conditions. They found that pure HI decomposition rate is higher than that of azeotrope solution.…”

Section: Introductionmentioning

confidence: 99%

Detailed kinetic modeling of homogeneous HI decomposition for hydrogen production, part I: Effect of H2O on HI decomposition

Zhang

Lin

et al. 2012

International Journal of Hydrogen Energy

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“…Favuzza et al [30] also reported the high stability of AC for 140 h during hydrogen iodidedecomposition. Wang et al [31] reported the overview of catalyst development at Institute of Nuclear and New Energy Technology, Tsinghua University, (INET), and also concluded that the future choice of catalysts for the hydrogen iodide-decomposition could either be "inexpensive catalyst (with a large quantity of AC) with large reactor" or "expensive catalyst (small quantity of supported Pt) with small reactor".…”

Section: Introductionmentioning

confidence: 98%

Catalytic performance of bimetallic Ni-Pt nanoparticles supported on activated carbon, gamma-alumina, zirconia, and ceria for hydrogen production in sulfur-iodine thermochemical cycle

Singhania

Krishnan

Bhaskarwar

et al. 2016

International Journal of Hydrogen Energy

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Bimetallic Ni-Pt nanoparticles supported on four different supports (activated carbon (AC)) 1 , γ-alumina, zirconia, and ceria) were prepared by modified impregnation-reduction technique for decomposition of hydrogen iodide to hydrogen and iodine, in the thermochemical water-splitting sulfur-iodine (SI) cycle. The catalysts were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET) method to find their structure, morphology, and surface area, respectively. High metal dispersions (Ni-Pt) were obtained with particle sizes of the order of 10 nm or lesser, in the high-surface-area supports. The hydrogen iodide-decomposition results showed the following catalytic activity order of Ni-Pt nanoparticles on different supports: Ni(2.5%)-Pt(2.5%)/AC > Ni(2.5%)-Pt(2.5%)/γ-alumina > Ni(2.5%)-Pt(2.5%)/Zirconia > Ni(2.5%)-Pt(2.5%)/Ceria. Bimetallic Ni(2.5%)-Pt(2.5%)/AC also showed excellent stability for 100 h in the hydrogen iodide-decomposition reaction, and with a higher performance relative to the corresponding Pt supported catalyst under the same operating conditions.

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Kinetics of hydrogen iodide decomposition over activated carbon catalysts in pellets

Cited by 50 publications

References 35 publications

Performance of Activated‐Carbon‐Supported Ni, Co, and Ni–Co Catalysts for Hydrogen Iodide Decomposition in a Thermochemical Water‐Splitting Sulfur–Iodine Cycle

Performance of Activated‐Carbon‐Supported Ni, Co, and Ni–Co Catalysts for Hydrogen Iodide Decomposition in a Thermochemical Water‐Splitting Sulfur–Iodine Cycle

Detailed kinetic modeling of homogeneous HI decomposition for hydrogen production, part I: Effect of H2O on HI decomposition

Catalytic performance of bimetallic Ni-Pt nanoparticles supported on activated carbon, gamma-alumina, zirconia, and ceria for hydrogen production in sulfur-iodine thermochemical cycle

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