CO<sub>2</sub> methanation over Ni–Al and Co–Al LDH-derived catalysts: the role of basicity

Lima, Dirléia dos Santos; Dias, Yan Resing; Perez‐Lopez, Oscar W.

doi:10.1039/d0se01059f

Cited by 33 publications

(38 citation statements)

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“…The peaks at around 360 °C and 500 °C were associated with two reduction processes of Co 3 O 4 to CoO and CoO to Co, respectively. The third peak at high reduction temperature appeared at around 700 °C, which could be explained by the fact that the formation of well‐dispersed CoO x species in the pore channel or the formation of CoAl 2 O 4 under calcination step [17,28] . In addition, the reduction peaks of Co 3 O 4 ‐Al 2 O 3 @USY and Co 3 O 4 ‐Al 2 O 3 catalysts were shifted towards higher temperatures compared with Co 3 O 4 /USY catalyst, which made it clear that the stronger interaction between Co and the support was formed.…”

Section: Resultsmentioning

confidence: 95%

“…The third peak at high reduction temperature appeared at around 700 °C, which could be explained by the fact that the formation of well-dispersed CoO x species in the pore channel or the formation of CoAl 2 O 4 under calcination step. [17,28] In addition, the reduction peaks of Co 3 O 4 -Al 2 O 3 @USY and Co 3 O 4 -Al 2 O 3 catalysts were shifted towards higher temperatures compared with Co 3 O 4 /USY catalyst, which made it clear that the stronger interaction between Co and the support was formed. The strong interaction was proved to be caused by the formation of the LDH structure, which could facilitate the formation of Table 1.…”

Section: Characterizationmentioning

confidence: 95%

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Fabricating Bifunctional Co−Al₂O₃@USY Catalyst via In‐Situ Growth Method for Mild Hydrodeoxygenation of Lignin to Naphthenes

Cheng

Jia

et al. 2022

ChemCatChem

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To enhance the catalytic activity and stability of metal catalysts in the hydrodeoxygenation of lignin derivatives into naphthenes, a bifunctional Co−Al2O3@USY catalyst was fabricated by the reduction of CoAl layered double hydroxide in‐situ grown on the USY zeolite. In the hydrodeoxygenation of guaiacol, a 100.0 % conversion with cyclohexane yield up to 93.6 % was achieved at 180 °C, 3 MPa for 4 h, which should be the hitherto lowest reaction temperature that has been reported over Co‐based metal catalysts. This catalyst was also relatively stable with 5 runs and exhibited excellent catalytic performance in the hydrodeoxygenation of other lignin model compounds and even real lignin feedstock into naphthenes. The high‐efficiency of Co−Al2O3@USY was attributed to the synergistic effect between well‐dispersed small Co nanoparticles and abundant acidic sites on the USY surface, while the outstanding stability was attributed to the anchoring effect of Al2O3 matrix to Co nanoparticles which avoided the leaching of Co species and particle agglomeration. This work provides a potential strategy for the design of an efficient and stable catalyst for lignin utilization.

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Section: Resultsmentioning

confidence: 95%

Section: Characterizationmentioning

confidence: 95%

Fabricating Bifunctional Co−Al₂O₃@USY Catalyst via In‐Situ Growth Method for Mild Hydrodeoxygenation of Lignin to Naphthenes

Cheng

Jia

et al. 2022

ChemCatChem

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“…60,61 The NiAl 2 O 4 phase at 45 has probably been overlapped by the NiO signal at 43.3 . 62 The presence of Cu into Ni-C was confirmed in the diffractograms of both Cu-WC and Cu-FC samples, by reflections at 2θ = 35.7 , 38.5 , 48.8 , 58.2 , and 61.4 which correspond to CuO. 63,64 The reduced catalysts in Figure 3A,B show peaks at 44.6 and 52 assigned to the Ni phase.…”

Section: Catalyst's Characterizationmentioning

confidence: 83%

“…63,64 The reduced catalysts in Figure 3A,B show peaks at 44.6 and 52 assigned to the Ni phase. 62 In addition, the Cu-FR e Cu-WR samples present two other narrow peaks with greater intensity at 43. From reference.…”

Section: Catalyst's Characterizationmentioning

confidence: 98%

Biogas reforming to syngas over cu‐modified Ni‐Al‐LDH catalysts

Rosset

Féris

Perez‐Lopez

2022

Intl J of Energy Research

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Ni-Al-LDH catalyst was modified with Cu to improve catalyst activity and deactivation resistance in biogas reforming. The samples were obtained by impregnation of Cu on Ni-Al previously prepared by coprecipitation, and characterized by X-ray diffractometry, N 2 physisorption, temperatureprogrammed reduction, CO 2 temperature-programmed desorption, and temperature-programmed oxidation. Catalytic tests were performed with CH 4 / CO 2 = 1.5 at 600 and 700 C in a fixed bed reactor. The characterization results revealed that the presence of Cu facilitates the reduction of Ni 2+ to Ni . The washing step influences the properties of the catalyst, since samples with low Cu content showed greater activity and stability than catalysts with high Cu content. At 700 C, the best results were obtained with the unreduced catalyst, with CH 4 conversions above 75%, because the reduction with H 2 at such condition causes catalyst sintering. No deactivation was observed at 600 C. The results achieved by the unreduced catalysts show potential for the production of H 2 as they do not require theactivation with H 2 . A mechanism for activating the catalyst with CH 4 was proposed.

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“…The catalytic tests were carried out in a system previously described, composed by a fixed‐bed tubular quartz reactor, an electric resistive furnace, and digital mass controllers (Sierra Instruments) 17,33,34,41 . The outlet gases were analyzed online in a Varian 3600 Cx gas chromatograph equipped with thermal conductivity detector using N 2 as carrier gas and a Porapak‐Q column.…”

Section: Methodsmentioning

confidence: 99%

Effect of Ni/Cu ratio on activity and selectivity of CO₂ methanation over Ni‐Cu/SiO₂ catalysts

Dias

Perez‐Lopez

2021

Greenhouse Gases

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In the present work two series of Ni‐Cu/SiO2 catalysts were evaluated in CO2 methanation. Samples with fixed Ni/Cu ratio and variable total metal loadings, and samples with fixed Ni loadings and variable Ni/Cu ratio were prepared by wet impregnation and characterized by N2 physisorption, X‐ray diffractometry, H2 temperature programmed reduction , scanning electron microscopy with energy dispersive spectroscopy , and temperature programmed oxidation. The catalytic tests were carried out from 250 to 450 °C, H2/CO2 = 4 and 1 atm in a fixed bed tubular reactor with online analysis by gas chromatography. Higher Ni loadings lead to higher Ni° crystallite sizes for samples with fixed Ni/Cu ratio, whereas no difference was observed for samples with variable Ni/Cu ratio. In addition, higher Ni/Cu ratios shifted the reduction temperature to higher values, revealing an increase in metal‐support interaction. Catalysts with Ni/Cu = 10 ratio presented almost equal CO2 conversion regardless of the Ni content, which is attributed to the increase in the Ni° crystallite size as the Ni content increases, whereas the selectivity for CH4 increased with the Ni content due to Ni migration to the surface. For catalysts with fixed Ni content, the higher the Ni/Cu ratio, the greater the CO2 conversion and the CH4 selectivity, demonstrating that the proper adjustment of the Ni/Cu ratio is essential for a high CH4 yield. The catalyst with the highest Ni/Cu ratio achieved a CO2 conversion of 63.3% and CH4 selectivity of 95.7% at 400 °C, showing the greatest resistance to sintering during 5 hr and low carbon formation, which can be attributed to the small crystallite size (∼15 nm) and high metal‐support interaction, resulting from an appropriate Ni/Cu ratio. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

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CO₂ methanation over Ni–Al and Co–Al LDH-derived catalysts: the role of basicity

Abstract: Ni-Al and Co-Al mixed oxides derived from hydrotalcites were prepared by coprecipitation and evaluated in CO2 methanation. The catalysts were characterized by N2 physisorption, XRD, H2-TPR, NH3-TPD, CO2-TPD, TPO and...

Cited by 33 publications

References 50 publications

Fabricating Bifunctional Co−Al₂O₃@USY Catalyst via In‐Situ Growth Method for Mild Hydrodeoxygenation of Lignin to Naphthenes

Fabricating Bifunctional Co−Al₂O₃@USY Catalyst via In‐Situ Growth Method for Mild Hydrodeoxygenation of Lignin to Naphthenes

Biogas reforming to syngas over cu‐modified Ni‐Al‐LDH catalysts

Effect of Ni/Cu ratio on activity and selectivity of CO₂ methanation over Ni‐Cu/SiO₂ catalysts

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CO2 methanation over Ni–Al and Co–Al LDH-derived catalysts: the role of basicity

Abstract: Ni-Al and Co-Al mixed oxides derived from hydrotalcites were prepared by coprecipitation and evaluated in CO2 methanation. The catalysts were characterized by N2 physisorption, XRD, H2-TPR, NH3-TPD, CO2-TPD, TPO and...

Cited by 33 publications

References 50 publications

Fabricating Bifunctional Co−Al2O3@USY Catalyst via In‐Situ Growth Method for Mild Hydrodeoxygenation of Lignin to Naphthenes

Fabricating Bifunctional Co−Al2O3@USY Catalyst via In‐Situ Growth Method for Mild Hydrodeoxygenation of Lignin to Naphthenes

Biogas reforming to syngas over cu‐modified Ni‐Al‐LDH catalysts

Effect of Ni/Cu ratio on activity and selectivity of CO2 methanation over Ni‐Cu/SiO2 catalysts

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CO₂ methanation over Ni–Al and Co–Al LDH-derived catalysts: the role of basicity

Fabricating Bifunctional Co−Al₂O₃@USY Catalyst via In‐Situ Growth Method for Mild Hydrodeoxygenation of Lignin to Naphthenes

Fabricating Bifunctional Co−Al₂O₃@USY Catalyst via In‐Situ Growth Method for Mild Hydrodeoxygenation of Lignin to Naphthenes

Effect of Ni/Cu ratio on activity and selectivity of CO₂ methanation over Ni‐Cu/SiO₂ catalysts