Sequential impregnation vs. sol-gel synthesized Ni/Al2O3-CeO2 nanocatalyst for dry reforming of methane: Effect of synthesis method and support promotion

Aghamohammadi, Sogand; Haghighi, Mohammad; Maleki, Mahin; Rahemi, Nader

doi:10.1016/j.mcat.2017.01.012

Cited by 117 publications

(35 citation statements)

References 54 publications

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“…Recently, Ni has gained the attention of several research teams working in the RWGS due to its relatively high activity and its economic viability compared to the noble metals discussed previously [12]. Additionally, the use of transition metal oxides, such as Al 2 O 3 , MgO, ZrO 2 and TiO 2 , have been investigated as supports for Ni catalysts [11,12,16,17]. Among these metal oxide carriers, researchers have proved that alumina can help the Ni particles dispersion via a large surface area [18].…”

Section: Introductionmentioning

confidence: 99%

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Yang

Pastor‐Pérez

et al. 2018

Applied Catalysis B: Environmental

151

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In the context of Carbon Capture and Utilisation (CCU), the catalytic reduction of CO 2 to CO via reverse watergas shift (RWGS) reaction is a desirable route for CO 2 valorisation. Herein, we have developed highly effective Ni-based catalysts for this reaction. Our study reveals that CeO 2 -Al 2 O 3 is an excellent support for this process helping to achieve high degrees of CO 2 conversions. Interestingly, FeO x and CrO x , which are well-known active components for the forward shift reaction, have opposite effects when used as promoters in the RWGS reaction. The use of iron remarkably boosts the activity, selectivity and stability of the Ni-based catalysts, while adding chromium results detrimental to the overall catalytic performance. In fact, the iron-doped material was tested under extreme conditions (in terms of space velocity) displaying fairly good activity/stability results. This indicates that this sort of catalysts could be potentially used to design compact RWGS reactors for flexible CO 2 utilisation units.

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Section: Introductionmentioning

confidence: 99%

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Yang

Pastor‐Pérez

et al. 2018

Applied Catalysis B: Environmental

151

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“…In the same way, comparative results for the temperature of 550°C are also shown in this Figure. In conventional FBR, as well as in other conventional reactors used in bibliography (mostly fixed bed reactors), the H 2 /CO ratio was roughly the one that could be achieved according to the thermodynamic equilibrium regardless of the methane conversion. Moreover, this methane conversion was always equal to or lower than the one for equilibrium estimated for gas phase at the working temperature (except for the works of Aghamohammadi et al [29] and Damyanova et al [30], working at 550°C and using catalysts containing Ce).…”

Section: Comparison With the Literaturementioning

confidence: 66%

Pure hydrogen from biogas: Intensified methane dry reforming in a two-zone fluidized bed reactor using permselective membranes

Durán

Sanz-Martínez

Soler

et al. 2019

Chemical Engineering Journal

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Methane dry reforming of biogas can be a sustainable source of hydrogen but the development of this technology is hindered by limitations such as endothermicity and catalyst deactivation by coke. A two zone fluidized bed reactor coupling permselective Pd/Ag membranes counteracts them and allows to intensify the process obtaining a stable pure hydrogen production. Here we report the effect of operation variables (i.e., temperature, total bed height, nature and partial pressure of regenerative agent, relative height of the regeneration and reaction zones, and use of an activation period) on the yield to hydrogen and stability of the process. Hydrogen over-yields, compared with the conventional fluidized bed reactor, in the range of +200% to +100% were obtained for the entire interval of temperatures 475-575°C whilst maintaining stable operation by continuous catalyst regeneration. Around 70% of it was pure hydrogen coming from the permeate side of the membranes. The proposed reactor configuration greatly increases both methane conversion and selectivity to hydrogen (expressed as H 2 /CO ratio), not only in relation to our own conventional reactor findings but also regarding other published results.

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“…Both syntheses approaches has shown a stable performance up to 10 h however, sol-gel synthesis technique recorded a considerably higher CH4 conversion than the impregnation route (90% versus 35% at 750 °C). In a similar study by Han et al [18], the addition of 2 wt % CeO2 to Al2O3 was studied at different Ni loadings (5-30 mol CeO 2 was reported to have excellent characteristics as a support material for Ni impregnation in DRM reactions, owing to its high oxygen mobility and positive impact on the oxidation state of Ni species [12,16,17]. However, the beneficial impact of CeO 2 are more pronounced when used as a promotor for Al 2 O 3 supports as demonstrated by Haghighi and coworkers [18].…”

Section: Effects Of the Support On The Catalytic Activity In Drmmentioning

confidence: 72%

Recent Advances in Supported Metal Catalysts for Syngas Production from Methane

2018

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Abstract:Over the past few years, great attention is paid to syngas production processes from different resources especially from abundant sources, such as methane. This review of the literature is intended for syngas production from methane through the dry reforming (DRM) and the steam reforming of methane (SRM). The catalyst development for DRM and SRM represents the key factor to realize a commercial application through the utilization of more efficient catalytic systems. Due to the enormous amount of published literature in this field, the current work is mainly dedicated to the most recent achievements in the metal-oxide catalyst development for DRM and SRM in the past five years. Ni-based supported catalysts are considered the most widely used catalysts for DRM and SRM, which are commercially available; hence, this review has focused on the recent advancements achieved in Ni catalysts with special focus on the various attempts to address the catalyst deactivation challenge in both DRM and SRM applications. Furthermore, other catalytic systems, including Co-based catalysts, noble metals (Pt, Rh, Ru, and Ir), and bimetallic systems have been included in this literature review to understand the observed improvements in the catalytic activities and coke suppression property of these catalysts.

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Sequential impregnation vs. sol-gel synthesized Ni/Al2O3-CeO2 nanocatalyst for dry reforming of methane: Effect of synthesis method and support promotion

Cited by 117 publications

References 54 publications

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Pure hydrogen from biogas: Intensified methane dry reforming in a two-zone fluidized bed reactor using permselective membranes

Recent Advances in Supported Metal Catalysts for Syngas Production from Methane

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