Effect of Ce/Ti ratio on the catalytic activity and stability of Ni/CeO2–TiO2 catalyst for dry reforming of methane

Kim, Sung Su; Lee, Sang Moon; Won, Jong Min; Yang, Hee Jae; Hong, Sung Chang

doi:10.1016/j.cej.2015.06.027

Cited by 60 publications

(22 citation statements)

References 43 publications

(63 reference statements)

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“…Different supports have been considered in the preparation of Nickel-based catalysts for DRM, such as single oxides (Al2O3 [23,24], MgO [25,26], CeO2 [27], ZrO2 [28], SiO2 [20,29]); ordered mesoporous silicas (SBA-15 [30], La2O3 [31], TiO2 [32]), The industrial applications of dry reforming are thus far limited to a combination of steam and dry reforming reactions. The addition of CO 2 into the feed allows a more accurate control of product distribution, i.e., generally resulting in lower H 2 /CO molar ratios.…”

Section: Introductionmentioning

confidence: 99%

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

et al. 2017

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Nickel-containing hydrotalcite-derived materials have been recently proposed as promising materials for methane dry reforming (DRM). Based on a literature review and on the experience of the authors, this review focuses on presenting past and recent achievements on increasing activity and stability of hydrotalcite-based materials for DRM. The use of different NiMgAl and NiAl hydrotalcite (HT) precursors, various methods for nickel introduction into HT structure, calcination conditions and promoters are discussed. HT-derived materials containing nickel generally exhibit high activity in DRM; however, the problem of preventing catalyst deactivation by coking, especially below 700 • C, is still an open question. The proposed solutions in the literature include: catalyst regeneration either in oxygen atmosphere or via hydrogasification; or application of various promoters, such as Zr, Ce or La, which was proven to enhance catalytic stability.

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Section: Introductionmentioning

confidence: 99%

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

et al. 2017

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“…At this temperature, CeO 2 particles can be reduced from Ce 4+ to Ce 3+ by H 2. On the other hand, the reduced CeO 2 particles could provide extra electrons that migrate to the neighbouring nickel sites or subsurface nickel merged inside MgO matrix and make Ni 2+ ions much easier to be reduced . The second reason is the reduction of the uncovered Ni 2+ ions at the outermost layer with square pyramidal coordination or the reduction of NiO that has no interaction with the MgO surface .…”

Section: Resultsmentioning

confidence: 99%

“…The first reason is the direct reduction of surface CeO 2 particles. At this temperature, CeO 2 particles can be reduced 24,25,38 The second reason is the reduction of the uncovered Ni 2+ ions at the outermost layer with square pyramidal coordination or the reduction of NiO that has no interaction with the MgO surface. 39,40 In order to further investigate the reason behind this, XRD experiment was conducted again to investigate the reduced catalysts, which were treated in a flow of 25 vol% H 2 in N 2 at 700°C for 2 hours.…”

Section: Characteristics Of Ni Speciesmentioning

confidence: 99%

“…In earlier studies, it was found that the strong metal‐support interaction (SMSI) inside the Ni‐Ce system enabled the stabilization of Ni particles and improved the reducibility of Ni 2+ ions . In fact, the spare electrons from Ce 3+ could migrate to neighbouring Ni 2+ ions and increase the reducibility of the subsurface Ni 2+ ions . This activation of nickel sites may improve hydrogen production via the acceleration of ion exchange between CO and H 2 O.…”

Section: Introductionmentioning

confidence: 99%

“…24 In fact, the spare electrons from Ce 3+ could migrate to neighbouring Ni 2+ ions and increase the reducibility of the subsurface Ni 2+ ions. 25 This activation of nickel sites may improve hydrogen production via the acceleration of ion exchange between CO and H 2 O. On the other hand, CeO 2 can accelerate water dissociation to form OH − groups, which are essential for the hydrogen production from C x H and C y O z H. 26,27 To develop a robust catalyst for the in situ hydrogen production in fuel cells, in this study, nano CeO x clusters were grown over the novel Ni x Mg y O matrix to introduce new interactions between CeO x clusters and the restrained nickel ions inside the subsurface MgO matrix.…”

Section: Introductionmentioning

confidence: 99%

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Highly efficient steam reforming of ethanol (SRE) over CeO _x grown on the nano Ni _x Mg _y O matrix: H ₂ production under a high GHSV condition

et al. 2019

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Summary Steam reforming of ethanol (SRE) over non‐noble metal catalysts is normally conducted at high temperature (>600°C) to thermodynamically favour the catalytic process and carbon deposition mitigation. However, high temperature inhibits water‐gas shift reaction (WGSR) and therefore restrains the yield of H2 and leads to the formation of an excessive amount of CO. The modification of non‐noble metal catalyst to enhance WGSR is an attractive alternative. In this study, CeOx was firstly loaded onto a nano‐scaled NixMgyO matrix and subsequently used as the catalyst for hydrogen production via SRE. Morphology of the catalyst materials was characterized by using a series of technologies, while H2‐temperature programmed reduction (H2‐TPR), CO‐temperature programmed deposition (CO‐TPD), and X‐ray photoelectron spectroscopy (XPS), were employed to study the surface nickel, ceria clusters, and their interactions. The catalytic activity and durability of the catalyst were studied in the temperature region of 500°C to 800°C. The CeOx‐coated nano NixMgyO matrix exhibited an outstanding hydrogen yield of 4.82 mol/molethanol under a high gas hourly space velocity (GHSV) of 200 000 hour−1. It is found that the unique Ni0‐CeOx structure facilitates the adsorption of CO on the surface and therefore promotes the effective hydrogen production via WGSR. Moreover, this modified NixMgyO matrix was found to be a more robust and anticoking nanocatalyst because of reversible switch between Ce4+ and Ce3+.

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Mesoporous Ni(OH)₂/CeNi_xO_y Composites Derived Ni/CeNi_xO_y Catalysts for Dry Reforming of Methane

Dou

Bao

2017

ChemCatChem

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Designing stable nickel‐based catalysts is critical for dry reforming of methane with carbon dioxide (DRM) to produce fuels and chemicals. Herein, mesoporous Ni(OH)2/CeNixOy composites were prepared by a one‐pot hydrothermal synthetic route. Aggregation of Ni(OH)2 nanoplates and CeNixOy nanocrystals generates mesopores from the void space and creates a surface area as high as 138 m2 g−1. With the Ni content in the range of 0.7–12.5 %, the mesoporous structure is stable after reduction with the highest surface area as 94 m2 g−1. Reduction of Ni(OH)2/CeNixOy composites at 500 °C converts Ni(OH)2 nanoplates into Ni nanoparticles. The size of the reduced Ni nanoparticles was controlled from 10 to 140 nm by adjusting the Ni loading from 0.7 to 42.7 %. The catalysts with Ni/(Ni+Ce) ratios of 0.4 and 0.5, 0.4 Ni/CeNixOy and 0.5 Ni/CeNixOy, respectively, exhibit enhanced catalytic performance for DRM reaction with their activities 3–5 times as high as those of 0.6 Ni/CeNixOy and 0.8 Ni/CeNixOy catalysts, owing to the good dispersion of 10 nm Ni nanoparticles within mesoporous CeNixOy. Furthermore, the 0.5 Ni/CeNixOy catalyst is very stable for DRM for 140 h. The robust stability of 0.5 Ni/CeNixOy catalyst possibly stems from the strong interactions between Ni nanoparticles and the CeNixOy surface, which stabilize Ni nanoparticles during DRM reaction.

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Effect of Ce/Ti ratio on the catalytic activity and stability of Ni/CeO2–TiO2 catalyst for dry reforming of methane

Cited by 60 publications

References 43 publications

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

Highly efficient steam reforming of ethanol (SRE) over CeO _x grown on the nano Ni _x Mg _y O matrix: H ₂ production under a high GHSV condition

Mesoporous Ni(OH)₂/CeNi_xO_y Composites Derived Ni/CeNi_xO_y Catalysts for Dry Reforming of Methane

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Effect of Ce/Ti ratio on the catalytic activity and stability of Ni/CeO2–TiO2 catalyst for dry reforming of methane

Cited by 60 publications

References 43 publications

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

Highly efficient steam reforming of ethanol (SRE) over CeO x grown on the nano Ni x Mg y O matrix: H 2 production under a high GHSV condition

Mesoporous Ni(OH)2/CeNixOy Composites Derived Ni/CeNixOy Catalysts for Dry Reforming of Methane

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Highly efficient steam reforming of ethanol (SRE) over CeO _x grown on the nano Ni _x Mg _y O matrix: H ₂ production under a high GHSV condition

Mesoporous Ni(OH)₂/CeNi_xO_y Composites Derived Ni/CeNi_xO_y Catalysts for Dry Reforming of Methane