Effect of rare earth elements (La, Y, Pr) in multi-element composite perovskite oxide supports for ammonia synthesis

Li, Wei; Wang, Shuang; Li, Jinping

doi:10.1016/j.jre.2020.06.006

Cited by 21 publications

(12 citation statements)

References 40 publications

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“…The high basicity of Ru/BCY-10 is closely related to its enhanced reducibility owing to the facile O L removal. Previous studies have demonstrated that the removal of O L from reducible supports results in the generation of electron-rich basic sites in the oxygen-deficient suboxide supports. ,, Thus, these results support that Y doping facilitates the formation of an SMSI interface between the electron-rich BCY- x supports and the Ru particles.…”

Section: Resultssupporting

confidence: 74%

Y-Doped BaCeO₃ Perovskite-Supported Ru Catalysts for CO_x-Free Hydrogen Production from Ammonia: Effect of Strong Metal–Support Interactions

Jeon

Kim

Tayal

et al. 2022

ACS Sustainable Chem. Eng.

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The development of highly efficient Ru-based catalysts for NH3 decomposition is necessary to enable the utilization of NH3 as a CO x -free H2 carrier. Modulation of the interactions between the basic support materials and Ru particles significantly enhances the performance of Ru-based catalysts for NH3 decomposition. In this study, the strong metal–support interaction (SMSI) interface between the BaCeO3 perovskite support and Ru particles was controlled by yttrium (Y) doping in the range of 0–20 mol %. The substitution of Y3+ into Ce4+ sites improved the reducibility of the support for the removal of lattice oxygen atoms, which promoted the formation of the SMSI interface between the mobile oxygen-deficient suboxide supports and Ru particles. The Ru catalysts supported on Y-doped BaCeO3 exhibited superior activity compared to undoped and other representative Ru catalysts. Moreover, the SMSI shell encapsulating the Ru particles improved the stability of the Y-doped Ru catalyst. This comprehensive study demonstrates that the enhancement in catalytic performance is attributable to facilitated N2 desorption, which is the rate-limiting step for NH3 decomposition over Ru-based catalysts, via the formation of the SMSI interface. These research findings show that the control of the SMSI interface is a promising strategy for designing highly active catalysts to be used in NH3 decomposition.

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Section: Resultssupporting

confidence: 74%

Y-Doped BaCeO₃ Perovskite-Supported Ru Catalysts for CO_x-Free Hydrogen Production from Ammonia: Effect of Strong Metal–Support Interactions

Jeon

Kim

Tayal

et al. 2022

ACS Sustainable Chem. Eng.

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“…The higher activity of Ru/BaCe 0.9 Y 0.1 O 3−δ was ascribed to the enhancement of the electronic conductivity by doping with Y 3+ . The comparison of Ru/BaCe 0.9 La 0.1 O 3−δ , Ru/BaCe 0.9 Y 0.1 O 3−δ , and Ru/ BaCe 0.9 Pr 0.1 O 3−δ was conducted by Li et al [68] They found that the Ru/BaCe 0.9 La 0.1 O 3−δ catalyst generated more oxygen vacancies than the other two catalysts, and thus more efficient electrons transferred from BaCe 0.9 La 0.1 O 3−δ to Ru. The strong metal-support interaction reduced the supported Ru size from 6.18 to 2.99 nm, ensuring more active B 5 -type sites.…”

Section: Re-incorporated Perovskitesmentioning

confidence: 99%

Insight into rare-earth-incorporated catalysts: The chance for a more efficient ammonia synthesis

Gong

et al. 2022

J Adv Ceram

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Recent studies have suggested that rare earth (RE) elements in catalysts significantly influence the performance of the ammonia synthesis. The REs appear in various forms in the ammonia synthesis catalysts including supports (oxides, hydrides, and nitrides), promotors, and intermetallic. Besides the conventional RE oxide-supporting catalysts (mainly Ru/REO), some new RE-containing catalyst systems, such as electrode and nitride systems, could drive the ammonia synthesis via a benign Mars—van Krevelen mechanism or multi-active-site mode, affording high ammonia synthesis performance under mild conditions. These works demonstrate the great potential of RE-containing catalysts for more efficient ammonia synthesis. This review summarizes the contributions of different kinds of RE-based catalysts and highlights the function mechanism of incorporated REs. Finally, an overview of this area and the challenges for further investigation are provided.

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“…Due to incompletely occupied 4f and empty 5d orbitals, rare-earth element praseodymium (Pr) has been widely applied as an additive in various elds (Li et al 2021;Qi et al 2020;Yan et al 2020;Mamidi et al 2018). As a promoter, Pr has also been used to enhance the catalytic activity, resistance to SO 2 and H 2 O of Mn-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

An investigation on the promoting effect of Pr modification on SO2 resistance over MnOx catalysts for selective reduction of NO with NH3

Zhai

Han

et al. 2021

Environ Sci Pollut Res

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Manganese oxides (MnO x ) exhibit excellent low-temperature activities in SCR reaction of NO with NH 3 , and they are considered as a promising catalyst for future application. However, MnO x still suffer from poor resistance to SO 2 and H 2 O. In this work, Pr was used to modify MnO x catalysts via co-precipitation process, and MnPrO x catalyst exhibited superior SO 2 resistance over pure MnO x catalyst. A series of characterization techniques, such as XRD, BET, H 2 -TPR, XPS, TG and in-situ DRIFTS, were adopted to explore the promoting effect of Pr modi cation on SO 2 resistance over MnO x catalyst in detail. The results indicated that, in the presence of SO 2 in feed gas, it seemed that PrO x rather than MnO x were apt to react with SO 2 , which was favorable to protect Mn active sites on the catalyst surface to some extent. It was known that there was strong competitive adsorption between SO 2 and NH 3 /NO species on SCR catalyst surface. In-situ DRIFTS results revealed that the adsorption of NH 3 and NO on MnO x catalyst had been severely suppressed after the introduction of SO 2 , resulting in the relevant SCR reactions following either L-H or E-R mechanisms would be inhibited obviously. But for Pr-modi ed MnO x catalyst, the introduction of SO 2 almost had no effect on the adsorption of NH 3 on catalyst surface, while it exerted a relatively noticeable impact on the adsorption of NO. As a result, SCR reactions occurred on Pr-modi ed MnO x catalyst surface could still proceed in a near-normal way through E-R rather than L-H mechanisms.Therefore, Pr modi cation on MnO x catalyst exhibited a distinctively promoting effect on SO 2 resistance performance in SCR process. HighlightsPr-modi ed MnO x catalyst exhibited superior SO 2 resistance over MnO x catalyst.Pr modi cation could inhibit the sulfation of Mn active sites on the surface of MnO x catalyst.For Pr-modi ed MnO x catalyst, the adsorption of NH 3 on Lewis acid sites was almost not affected by SO 2 , and the inhibition degree of SO 2 for NO adsorption was lower than that of MnO x catalyst.The SCR reaction on Pr-modi ed MnO x catalyst might follow E-R mechanism in the presence of SO 2 .

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Effect of rare earth elements (La, Y, Pr) in multi-element composite perovskite oxide supports for ammonia synthesis

Cited by 21 publications

References 40 publications

Y-Doped BaCeO₃ Perovskite-Supported Ru Catalysts for CO_x-Free Hydrogen Production from Ammonia: Effect of Strong Metal–Support Interactions

Y-Doped BaCeO₃ Perovskite-Supported Ru Catalysts for CO_x-Free Hydrogen Production from Ammonia: Effect of Strong Metal–Support Interactions

Insight into rare-earth-incorporated catalysts: The chance for a more efficient ammonia synthesis

An investigation on the promoting effect of Pr modification on SO2 resistance over MnOx catalysts for selective reduction of NO with NH3

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Effect of rare earth elements (La, Y, Pr) in multi-element composite perovskite oxide supports for ammonia synthesis

Cited by 21 publications

References 40 publications

Y-Doped BaCeO3 Perovskite-Supported Ru Catalysts for COx-Free Hydrogen Production from Ammonia: Effect of Strong Metal–Support Interactions

Y-Doped BaCeO3 Perovskite-Supported Ru Catalysts for COx-Free Hydrogen Production from Ammonia: Effect of Strong Metal–Support Interactions

Insight into rare-earth-incorporated catalysts: The chance for a more efficient ammonia synthesis

An investigation on the promoting effect of Pr modification on SO2 resistance over MnOx catalysts for selective reduction of NO with NH3

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Y-Doped BaCeO₃ Perovskite-Supported Ru Catalysts for CO_x-Free Hydrogen Production from Ammonia: Effect of Strong Metal–Support Interactions

Y-Doped BaCeO₃ Perovskite-Supported Ru Catalysts for CO_x-Free Hydrogen Production from Ammonia: Effect of Strong Metal–Support Interactions