CO2 reforming of methane over Ni/ZnAl2O4 catalysts: Influence of Ce addition on activity and stability

Movasati, Azam; Alavi, Seyed Mehdi; Mazloom, Golshan

doi:10.1016/j.ijhydene.2017.05.199

Cited by 52 publications

(14 citation statements)

References 55 publications

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“…Based on the Zn content used in the catalyst, ZnO and ZnAl 2 O 4 spinel phase can be obtained. In the catalysts with Zn/Al ratio lower than 1, the ZnAl 2 O 4 spinel phase (2Θ = 31.2°, 36.8°, 44.8°, 48.5°, 55.6°, 59.3°, 65.2°, JCPDS‐5‐669) was mainly formed in the support structure . With increasing Zn/Al ratio, the intensity of the diffraction lines of the spinel phase gradually decreased, reflection lines assigned to ZnO phase (2Θ = 31.8°, 34.4°, 36.3°, 47.5°, 56.6°, 62.8°, 66.3°, 67.9°, 69.0°) appeared and became more intense .…”

Section: Resultsmentioning

confidence: 99%

“…In the catalysts with Zn/Al ratio lower than 1, the ZnAl 2 O 4 spinel phase (2Θ = 31.2 ∘ , 36.8 ∘ , 44.8 ∘ , 48.5 ∘ , 55.6 ∘ , 59.3 ∘ , 65.2 ∘ , JCPDS-5-669) was mainly formed in the support structure. 8 With increasing Zn/Al ratio, the intensity of the diffraction lines of the spinel phase gradually decreased, reflection lines assigned to ZnO phase (2Θ = 31.8 ∘ , 34.4 ∘ , 36.3 ∘ , 47.5 ∘ , 56.6 ∘ , 62.8 ∘ , 66.3 ∘ , 67.9 ∘ , 69.0 ∘ ) appeared and became more intense. 18 Similar results were recorded by Anjaneyulu et al 18 when the Zn/Al ratio was 0.5 and 2.…”

Section: Characterization Tests Of the Fresh Catalystsmentioning

confidence: 95%

“…The different catalysts studied in the well-documented literature for DRM can be categorized into noble and non-noble metals such as (Rh, Pt) and (Ni, Co and Fe), respectively. 8 Supported Ni catalysts, especially Ni/Al 2 O 3 , are favored for commercialization of DRM technology due to their high activity, low cost and availability. [9][10][11] However, application of Ni-based catalysts at industrial scale has been restricted owing to two main concerns; sintering and deposited coke.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic performance of Ni supported on ZnO‐Al₂O₃ composites with different Zn content in methane dry reforming

Nataj

Alavi

Mazloom

2019

J of Chemical Tech & Biotech

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BACKGROUND Because of increasing environmental contaminations, hydrogen has attracted much attention as an effective and clean energy source. In addition, hydrogen and syngas are raw materials used in the production of valuable compounds. Methane dry reforming is one common method for syngas production. In this work, Ni catalysts supported on different ZnO–Al2O3 composite oxides were prepared. The effects of variation in Zn/Al ratio (Zn/Al = 0, 0.33, 0.5, 1, 2 and 3) on physico‐chemical properties and their activity and stability in methane dry reforming were investigated. RESULTS The results indicated that Zn addition led to decreasing surface area, weakening the interaction between active phase and support, improving Ni reduction and therefore enhancing initial activity. CONCLUSION When Zn content was low or just enough to produce ZnAl2O4 phase, only metallic Ni particles were detected after reaction which led to carbon filaments formation and deactivation of catalysts. Increasing Zn content formed NiZn alloy that played essential roles in activity and stability. High amounts of Zn (Zn/Al = 3) did not favor promoting effects due to the increasing active phase sizes and decreasing contact area. Ni/ZnO–Al2O3 with Zn/Al = 2 exhibited the highest activity and stability in methane dry reforming. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Characterization Tests Of the Fresh Catalystsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Catalytic performance of Ni supported on ZnO‐Al₂O₃ composites with different Zn content in methane dry reforming

Nataj

Alavi

Mazloom

2019

J of Chemical Tech & Biotech

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“…Composed of geometrically well-defined structures of central metal atoms connected by organic linkers, the MOF can be used as a structure-by-design precursor to produce highly-dispersed metallic particles (Rogge et al, 2017). The additional of CeO2 promotes higher activity with more stable basic sites, and inhibits the coke deposition due to its high oxygen mobility, high oxygen storage capacity and constraint on particle size, as reported in previous literature (Loc et al, 2017;Movasati et al, 2017) In this study, a facile approach focused on the effects of Ni:Ce molar ratio on catalytic performance of an alumina-supported catalyst in DRM. A series of bimetallic catalysts with various Ni/Ce ratios were prepared through solvothermal method, and characterized to study the physical and chemical properties of the MOF-derived catalysts.…”

Section: Introductionmentioning

confidence: 86%

Preparation of Metal Organic Framework (MOF) Derived Bimetallic Catalyst for Dry Reforming of Methane

Chin¹,

Leong²,

Lu³

et al. 2019

IJTech

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In the past decade, efforts have been focused on development of catalyst to show high activity for dry reforming of methane (DRM). The development of catalyst has been crucial to be carried out as this may significantly reduce the concentration of most common greenhouse gases, namely methane (CH4) and carbon dioxide (CO2) in the atmosphere. In present work, a series of varying molar ratio of Ni:Ce metal organic framework (MOF) derived catalysts were grown on alumina in one step. The synthesis steps were in accordance to reported solvothermal method for the syntheses of NH2-MIL-88B with slight modification. This was followed by reduction at 500C in hydrogen environment for 1 h. The physical and chemical properties of the catalysts were probed by powder XRD, BET surface area analysis, EDX, ICP, CO2-TPD and H2-TPR. XRD showed that diffraction patterns were in agreement with the diffraction pattern of MOF synthesized in previous work, thus confirmed the successful formation of the MOF structure. The variation in the molar ratio of Ni:Ce did not show significant difference in the diffraction pattern of the MOF-derived catalysts. For reduction phase, sharp diffraction peaks were detected at 2θ = 44.5, 51.85, and 76.37, which can be indexed to (1 1 1), (2 0 0) and (2 2 0) planes of face-centered cubic (FCC) metallic Ni, respectively. The addition of Ce promoted smaller particle size of Ni, ranging from 4.6 nm to 6.88 nm. The presence of CeO2 was observed at 2θ = 28.6, 33.0, and 56.4. Elemental distribution was compared between EDX and ICP-OES. ICP-OES and EDX analyses indicated that weight percent of bimetallic metal of Ni and Ce was consistent, in which the amount of respective metal obeyed the ratio trend of the metal precursors added during the MOF synthesis. This suggested the homogeneity of the catalyst, even though EDX showed relatively higher weight percent than ICP-OES. The catalytic performance of catalysts showed that 1Ni1Ce exhibited better conversion of CH4 and CO2, with 63.5% and 86.8% respectively at 800 o C, and the conversion tend to increase at a higher temperature. The results were convincing for the design of a performing catalyst for DRM process.

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“…Conventional catalytic supports including Al 2 O 3 , MgO, TiO 2 , ZrO 2 , SiC, zeolites, and nanostructured carbons were frequently reported in the literature for DRM [24][25][26][27][28]. The combination of several metal oxides allowed improving catalytic performance [27,29,30]. However, up-to-date and to the best of our knowledge, there is not application of DRM at large industrial scale yet.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Phan

Sane

Vasconcelos

et al. 2018

Applied Catalysis B: Environmental

135

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A B S T R A C T Hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) has all the criteria of a catalyst support, in particular its high thermal stability. However it is still less studied in the heterogeneous catalysis. For the first time, hydroxyapatite supported bimetallic Co-Ni catalysts were prepared and evaluated in the dry reforming of methane (DRM) process. Nanoparticles containing both nickel and cobalt were well formed on the surface of HAP by conventional impregnation methods. No modification of HAP structure was observed after metals deposition. DRM reaction was carried out at 700-750°C and around 1.6 bar, using a fixed-bed reactor which was fed with a mixture of 20%vol CH 4 , 20%vol CO 2 and 60%vol N 2 . CH 4 and CO 2 conversion reached up to 60 and 68% at 700°C, respectively, and 73 and 79% at 750°C, respectively during long reaction times of 50-160 h. Water as a by-product could be quantified along the catalytic reaction indicating the implication of reverse water-gas-shift reaction. TEM-EDX analysis of the used catalysts recovered after catalytic tests showed that coke deposition was limited and there was slight modification of metals particle size. The results obtained were very promising for the design of an efficient catalytic system for DRM process.

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CO2 reforming of methane over Ni/ZnAl2O4 catalysts: Influence of Ce addition on activity and stability

Cited by 52 publications

References 55 publications

Catalytic performance of Ni supported on ZnO‐Al₂O₃ composites with different Zn content in methane dry reforming

Catalytic performance of Ni supported on ZnO‐Al₂O₃ composites with different Zn content in methane dry reforming

Preparation of Metal Organic Framework (MOF) Derived Bimetallic Catalyst for Dry Reforming of Methane

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

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CO2 reforming of methane over Ni/ZnAl2O4 catalysts: Influence of Ce addition on activity and stability

Cited by 52 publications

References 55 publications

Catalytic performance of Ni supported on ZnO‐Al2O3 composites with different Zn content in methane dry reforming

Catalytic performance of Ni supported on ZnO‐Al2O3 composites with different Zn content in methane dry reforming

Preparation of Metal Organic Framework (MOF) Derived Bimetallic Catalyst for Dry Reforming of Methane

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

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Catalytic performance of Ni supported on ZnO‐Al₂O₃ composites with different Zn content in methane dry reforming

Catalytic performance of Ni supported on ZnO‐Al₂O₃ composites with different Zn content in methane dry reforming