A study of the synergy between support surface properties and catalyst deactivation for CO 2  reforming over supported Ni nanoparticles

Das, Subhasis; Sengupta, Manideepa; Patel, Jim; Bordoloi, Ankur

doi:10.1016/j.apcata.2017.07.044

Cited by 121 publications

(48 citation statements)

References 39 publications

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“…In addition, an excess amount of atomic oxygen can oxidize neighboring Ni atoms into NiO, which are not catalytically active towards DRM reaction. Very recently it has been demonstrated that excessive surface basicity led to catalyst deactivation by carbon formation and formation of metal-oxides [59]. The excessive surface acidity also caused the catalytic deactivation by carbon deposition through the promoted decomposition of methane.…”

Section: Adjustment Of Acidity and Basicity Of Catalyst Surfacementioning

confidence: 99%

“…The excessive surface acidity also caused the catalytic deactivation by carbon deposition through the promoted decomposition of methane. Das et al suggested that the moderate acidity and basicity on catalyst surface is important factor, together with their homogeneous distribution that determines catalytic conversion ratio of DRM reaction and long-term stability of supported metal catalysts (Figure 4) [59]. La2O3 has been also used either as a basic support or a basic promoter for supported Ni catalysts [60].…”

Section: Adjustment Of Acidity and Basicity Of Catalyst Surfacementioning

confidence: 99%

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Recent Scientific Progress on Developing Supported Ni Catalysts for Dry (CO2) Reforming of Methane

Seo

2018

Catalysts

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Two major green house gases (CO 2 and CH 4 ) can be converted into useful synthetic gas (H 2 and CO) during dry reforming of methane (DRM) reaction, and a lot of scientific efforts has been made to develop efficient catalysts for dry reforming of methane (DRM). Noble metal-based catalysts can effectively assist DRM reaction, however they are not economically viable. Alternatively, non-noble based catalysts have been studied so far, and supported Ni catalysts have been considered as a promising candidate for DRM catalyst. Main drawback of Ni catalysts is its catalytic instability under operating conditions of DRM (>700 • C). Recently, it has been demonstrated that the appropriate choice of metal-oxide supports can address this issue since the chemical and physical of metal-oxide supports can prevent coke formation and stabilize the small Ni nanoparticles under harsh conditions of DRM operation. This mini-review covers the recent scientific findings on the development of supported Ni catalysts for DRM reaction, including the synthetic methods of supported Ni nanoparticles with high sintering resistance.

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Section: Adjustment Of Acidity and Basicity Of Catalyst Surfacementioning

confidence: 99%

Section: Adjustment Of Acidity and Basicity Of Catalyst Surfacementioning

confidence: 99%

Recent Scientific Progress on Developing Supported Ni Catalysts for Dry (CO2) Reforming of Methane

Seo

2018

Catalysts

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“…They propose a bifunctional mechanism triggered by surface hydroxyl groups. Das et al . concluded in their investigations of Ni supported on modified silica and alumina that a moderate acidity‐basicity is best for a stable and active DRM catalyst.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Dry Reforming of Methane: Insights from Model Systems

Wittich¹,

et al. 2020

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Catalytic dry reforming under industrially relevant conditions of high pressures and high temperatures poses severe challenges towards catalyst materials and process engineering. The demanding conditions under which the reaction is performed lead to a coupling of reactions occurring in the gas phase and reactions which are catalyzed by the material employed as catalyst. A profound analysis of the mechanisms occurring in gas phase and resulting products from gas phase reactions is key to understanding part of the challenges that any catalyst material, irrespective of its nature, will have to cope with. The deposition of coke on an active catalyst is as well one of the most limiting factors for catalyst lifetime and catalyst activity in dry reforming. Therefore, an understanding of the thermodynamics behind coke formation and an intricate description of the mechanisms driving the evolution of coke is a vital piece of the picture. Acid-base properties of the catalyst material and the role and nature of the active metal do also need to be considered. A large part of the review deals with mechanisms which are relevant for coke gasification and insights into materials properties, which are relevant to allow for reaction pathways along these lines. The review article focusses on research results which have been achieved using model systems -typically the analysis of model systems is a more rewarding exercise compared to fully formulated industrial catalyst systems, as here more elucidating structure-property relationships can be drawn. Additionally the article discusses dry methane reforming in the context of alternative syngas generation technologies and attempts to create an application perspective for the reader in the context of a sustainable approach towards carbon capture and storage.

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“…The peak observed on Ni/FZSM‐5 at 529.1, 530.8 and 532.1 corresponds to Si ‐ O ‐ Ni, Si ‐ O ‐ Al and Si ‐ O ‐ Si bonds, respectively . In the case of Ni‐Ta/FZSM‐5, additional peak at 532.9 eV belonging to Si ‐ O ‐ Ta bond was observed . In addition, small Ta 4f 7/2 peak (Figure C) around 26.1 eV is attributed to Ta 5+ presence on Ni‐Ta/FZSM‐5 catalyst …”

Section: Resultsmentioning

confidence: 98%

Fibrous spherical Ni‐M/ZSM‐5 (M: Mg, Ca, Ta, Ga) catalysts for methane dry reforming: The interplay between surface acidity‐basicity and coking resistance

et al. 2020

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A highly active and robust fibrous spherical ZSM-5-supported nickel catalyst with different promoters (Mg, Ca, Ta, Ga) have been synthesised by microemulsion method for dry reforming of methane (DRM). The structural framework provided by the unique fibrous spherical ZSM-5 aided confinement of Ni particles. Catalytic activity was improved by homogenous distribution of surface acid-basic sites, thereby reducing the propensity of coke deposition.Bimetallic Ni-Ta catalyst produced the highest CH 4 and CO 2 conversions at 93% and 98%, respectively, with H 2 /CO ratio closer to unity (0.97). The nature of acid sites and bimetallic Ni-Ta synergism amplified interaction of catalyst components, resulting in improved interaction with the reactants, thus impeding metal sintering and coke deposition. Consequently, the Ni-Ta/FZSM-5 catalyst shows long-term activity (80 hours) for the DRM reaction at 800 C. K E Y W O R D Sdry reforming, methane, Ni/ZSM-5, nickel, tantalum

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A study of the synergy between support surface properties and catalyst deactivation for CO 2 reforming over supported Ni nanoparticles

Cited by 121 publications

References 39 publications

Recent Scientific Progress on Developing Supported Ni Catalysts for Dry (CO2) Reforming of Methane

Recent Scientific Progress on Developing Supported Ni Catalysts for Dry (CO2) Reforming of Methane

Catalytic Dry Reforming of Methane: Insights from Model Systems

Fibrous spherical Ni‐M/ZSM‐5 (M: Mg, Ca, Ta, Ga) catalysts for methane dry reforming: The interplay between surface acidity‐basicity and coking resistance

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