2015
DOI: 10.1039/c5cc05226b
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A highly active and stable Ni–Mg phyllosilicate nanotubular catalyst for ultrahigh temperature water-gas shift reaction

Abstract: A Ni-Mg phyllosilcate (PS) nanotubular catalyst has been developed by introducing Mg into Ni phyllosilicate nanotubes (PSNTs). The thermal stability is improved significantly. Furthermore, this binary metal PS nanotubular catalyst exhibits excellent activity and stability for ultrahigh temperature water-gas shift (WGS) reaction.

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Cited by 58 publications
(27 citation statements)
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“…All the catalysts show two reduction peaks; one in the relatively low temperature range of 540–580 °C, which is usually attributed to the reduction of Ni 2+ species that interact weakly with the support, mainly NiO in our case . The other is at a high temperature of 750–780 °C, which could be assigned to the reduction of Ni 2+ species in the PS phase with a strong metal–support interaction . The coexistence of NiO and NiPS is, therefore, confirmed.…”
Section: Resultssupporting
confidence: 72%
“…All the catalysts show two reduction peaks; one in the relatively low temperature range of 540–580 °C, which is usually attributed to the reduction of Ni 2+ species that interact weakly with the support, mainly NiO in our case . The other is at a high temperature of 750–780 °C, which could be assigned to the reduction of Ni 2+ species in the PS phase with a strong metal–support interaction . The coexistence of NiO and NiPS is, therefore, confirmed.…”
Section: Resultssupporting
confidence: 72%
“…Thus consumed hydroxyls can be regenerated by chemisorbing H 2 O molecules on octahedral nickel oxides in PS . Recently, our group has also reported binary metal PS nanotubes for ultrahigh‐temperature WGS reaction . Therein, by introducing Mg into Ni‐containing PS, the thermal stability of the nanotube was improved significantly.…”
Section: Introductionmentioning
confidence: 99%
“…[27] Recently,o ur group has also reported binary metal PS nanotubes foru ltrahigh-temperature WGS reaction. [32] Therein, by introducingM gi nto Ni-containing PS, the thermals tabilityo ft he nanotube was improved significantly.H owever,t he effect of the hydroxyl group in the Ni-PS on the reactivity and selectivity of WGS reactionh as not been reportedt hus far.T herefore, our objective herein is the investigationo ft he effect of hydroxyl groups generated by Ni-PS on the WGS reaction. To explore the role and amounts of hydroxyl groups generated in Ni/SiO 2 catalysts via Ni-PS structures, we have synthesized Ni/SiO 2 catalysts by using two different methods, namely,i mpregnation( denoted as Ni/SiO 2 ) and ammonia evaporation (AE, denoted as Ni/SiO 2P ).…”
Section: Introductionmentioning
confidence: 99%
“…Based on the reports from Valsamakis et el., Masato et al., and previous work from our group, lanthanide oxysulfides revealed a similar redox mechanism in the WGS reaction (S 2− ↔S 6+ ) as CeO 2 (Ce 4+ ↔Ce 3+ ), but with eight times higher oxygen storage than CeO 2 . This category of catalyst functions well at ultrahigh temperatures (>700 °C) for the WGS reaction, enabling fast hydrogen production rates as perovskite catalytic systems . However, their catalytic activities, such as carbon monoxide (CO) conversion and hydrogen (H 2 ) selectivity, still need to be optimized.…”
Section: Introductionmentioning
confidence: 99%
“…Based on the reports from Valsamakis et el., [10,11] Masatoe tal., [12,13] and previous work from our group, [14,15] lanthanide oxysulfidesr evealeda similar redox mechanism in the WGS reaction (S 2À $S 6 + )a s CeO 2 (Ce 4 + $Ce 3 + ), but with eightt imes highero xygen storage than CeO 2 .T his categoryo fc atalyst functions well at ultrahigh temperatures (> 700 8C) for the WGS reaction, enabling fast hydrogen production rates as perovskite catalytic systems. [16,17] However,t heir catalytic activities, such as carbon monoxide (CO) conversion and hydrogen (H 2 )s electivity,s till need to be optimized. Therefore, given that occupying the Ln 3 + sites with Na + generates oxygen vacancies and possible lattice change, we hypothesize that sodium dopingm ay result in enhanced catalytic properties of lanthanide oxysulfides towards the WGS reaction, whereas maintaining desirable sulfur tolerance in both sulfur-free and sulfur-rich environments.…”
Section: Introductionmentioning
confidence: 99%