Highly active NiO-CeO2 catalysts for synthetic natural gas production by CO2 methanation

Atzori, Luciano; Cutrufello, Maria Giorgia; Meloni, Daniela; Cannas, Carla; Gazzoli, Delia; Monaci, Roberto; Sini, Maria Franca; Rombi, Elisabetta

doi:10.1016/j.cattod.2017.05.065

Cited by 60 publications

(45 citation statements)

References 30 publications

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“…The Gaussian-type deconvolution of the profile was also carried out, thus allowing the evaluation of hydrogen consumption. All the catalytic samples had similar reduction behaviour with two broad reduction zones between 50-250 °C and above 250 °C, respectively ascribable to noble [37] metals (rhodium oxides are commonly reduced at lower temperatures compared to the Pt ones [38]) and non-noble metal [39] reduction. An additional shoulder always accompanies the major peak observed at lower temperature.…”

Section: Textural/structural Properties and H 2 -Tpr Measurementsmentioning

confidence: 91%

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

et al. 2017

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Abstract:In this work, a series of CeO 2 -SiO 2 (30 wt % of ceria)-based catalysts was prepared by the wetness impregnation method and tested for ESR (ethanol steam reforming) at 450-500 • C, atmospheric pressure and a water/ethanol ratio increasing from 4 to 6 (the ethanol concentration being fixed to 10 vol %); after every test, coke gasification measurements were performed at the same water partial pressure, and the temperature of the test and the gasified carbon was measured from the areas under the CO and CO 2 profiles. Finally, oxidation measurements under a 5% O 2 /N 2 stream made it possible to calculate the total carbon deposited. In an attempt to improve the coke resistance of a Pt-Ni/CeO 2 -SiO 2 catalyst, the effect of support basification by alkali addition (K and Cs), as well as Pt substitution by Rh was investigated. The novel catalysts, especially those containing Rh, displayed a lowering in the carbon formation rate; however, a faster reduction of ethanol conversion with time-on-stream and lessened hydrogen selectivities were recorded. In addition, no significant gain in terms of coke gasification rates was observed. The most active catalyst (Pt-Ni/CeO 2 -SiO 2 ) was also tested under different operative conditions, in order to study the effect of temperature and water/ethanol ratio on carbon formation and gasification. The increase in the water content resulted in an enhanced reactor-plugging time due to reduced carbonaceous deposits formation; however, no effect of steam concentration on the carbon gasification rate were recorded. On the other hand, the increase in temperature from 450-500 • C lowered the coke selectivity by almost one order of magnitude improving, at the same time, the contribution of the gasification reactions.

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Section: Textural/structural Properties and H 2 -Tpr Measurementsmentioning

confidence: 91%

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

et al. 2017

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“…Besides favoring CO activation on metallic Ni 0 [5,20], ceria is the main responsible for CO 2 adsorption and activation, as confirmed by the microcalorimetric results. CO 2 would preferentially adsorb on the ceria component of the support, most probably forming first carbonate and hydrogencarbonate species, which would then be hydrogenated to formates and finally to methane by the hydrogen previously adsorbed and activated by the metallic Ni 0 nanoparticles [27,36,38,42]. Therefore, the beneficial effect of the Ce content in the hydrogenation of CO 2 is most likely due also to the superior ability of CeO 2 in activating CO 2 .…”

Section: Co + 3 H2mentioning

confidence: 99%

CO and CO2 Co-Methanation on Ni/CeO2-ZrO2 Soft-Templated Catalysts

et al. 2019

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Supported nickel catalysts were synthesized, characterized, and employed in the carbon oxides co-methanation process. Five NiO/CeO2-ZrO2 mixed oxides, with the same Ni content and different Ce/Zr molar ratios, were prepared by the soft-template method. They were characterized through ICP-AES, N2 adsorption, XRD, and TPR. Reduced Ni/CeO2-ZrO2 catalysts were obtained by submitting the oxide systems to reduction treatment in H2 at 400 °C. They were characterized by XRD, H2-TPD, and CO2 adsorption microcalorimetry and their catalytic performances in the carbon oxides co-methanation were investigated. Catalytic tests were performed in a fixed-bed continuous-flow microreactor at atmospheric pressure. The effect of experimental conditions (reaction temperature, space velocity, reactants molar ratio) was also studied. Almost complete CO conversion was obtained on any catalyst, whereas CO2 conversion was much lower and increased with Ce content, at least up to Ce/Zr = 1. The beneficial effect of the Ce content could be related to the increased NiO reducibility and to the higher ability to adsorb and activate CO2. However, at high Ce/Zr ratios, it is probably counterbalanced by an interplay of reactions involving CO and CO2.

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“…From the distribution of the reduction peak position of MF‐NiO/2D‐VT and MW‐NiO/2D‐VT, the reduction peak of MW‐NiO/2D‐VT is at a lower temperature than that of MF‐NiO/2D‐VT. This occurs because nano‐NiO particles loaded on MW‐NiO/2D‐VT have a smaller crystal size and spherical shape (Figure ), are more easily reduced in the H 2 atmosphere, and are more likely to express their own metal oxide properties . The calculation of reaction activation energy in Figure also illustrates this.…”

Section: Resultsmentioning

confidence: 56%

Microwave‐Assisted Rapid Preparation of Vermiculite‐Loaded Nano‐Nickel Oxide As a Highly Efficient Catalyst for Acetylene Carbonylation to Synthesize Acrylic Acid

Guo

Shang

et al. 2020

ChemistrySelect

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With CuBr2 as a co‐catalyst, the nickel‐supported two‐dimensional layered vermiculite (2D‐VT)‐based composite [Ni(NO3)2•6H2O/2D‐VT] was used as a precursor and applied to various calcination methods to produce catalysts. These catalysts were used in the acetylene carbonylation reaction to synthesize acrylic acid (AA). The catalysts were characterized and evaluated by scanning electron microscope (SEM), transmission electron microscope (TEM), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), inductively coupled plasma (ICP), hydrogen temperature‐programmed reduction (H2‐TPR), nitrogen adsorption desorption analyzer (BET) and thermogravimetric analysis (TG). We found that the microwave (MW) radiation calcined catalyst (MW‐NiO/2D‐VT) exhibited better catalytic performance than the muffle furnace (MF) calcination catalyst (MF‐NiO/2D‐VT). This difference is observed owing to the fast speed of microwave radiation heating, short baking time, and the instantaneous formation of nano‐NiO particles that have better dispersibility and uniformity, which is more conducive to the performance expression of nickel oxide. Under the optimal reaction conditions, the yield of AA is 86.3%. During the reaction, the MW‐NiO/2D‐VT catalyst is more stable and produces less by‐deposits than the MF‐NiO/2D‐VT catalyst. Thus, MW‐NiO/2D‐VT is more conducive to improving the selectivity of AA. In addition, theoretical calculations show that the MW‐NiO/2D‐VT catalyst has a lower apparent activation energy, which kinetically explains why MW‐NiO/2D‐VT is an excellent catalyst.

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Highly active NiO-CeO2 catalysts for synthetic natural gas production by CO2 methanation

Cited by 60 publications

References 30 publications

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

CO and CO2 Co-Methanation on Ni/CeO2-ZrO2 Soft-Templated Catalysts

Microwave‐Assisted Rapid Preparation of Vermiculite‐Loaded Nano‐Nickel Oxide As a Highly Efficient Catalyst for Acetylene Carbonylation to Synthesize Acrylic Acid

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