Enhanced low-temperature performance of CO2 methanation over mesoporous Ni/Al2O3-ZrO2 catalysts

Lin, Jie; Ma, Caiping; Wang, Qiong; Xu, Yanfei; Ma, Guangyuan; Wang, Jie; Wang, Hongtao; Dong, Chenglong; Zhang, Chenghua; Ding, Mingyue

doi:10.1016/j.apcatb.2018.10.059

Cited by 224 publications

(98 citation statements)

References 56 publications

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“…This is thought to be a protected re-oxidation reaction due to the presence of oxygen in the reactant gas, which prevents the forward reaction in CH4 synthesis paths (1) and (2). According to the mechanism proposed by Lin et al [21], CO2 is separated from the oxygen vacancies…”

Section: Effect Of Initial Oxygen Concentration On Co2 Conversionmentioning

confidence: 99%

“…Typically, promoters are used for improving the activity of supported catalysts. For example, the promoter MgO can increase carbon resistance [17], thermal stability [18], and the dispersion of Ni/Al 2 O 3 catalysts [19,20], affording enhanced activity [21,22]. Thus, MgO, in combination with support materials such as Al 2 O 3 or SiO 2 has been proposed as a support for methanation catalysts [23,24].…”

Section: Introductionmentioning

confidence: 99%

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CO2 Methanation of Biogas over 20 wt% Ni-Mg-Al Catalyst: on the Effect of N2, CH4, and O2 on CO2 Conversion Rate

et al. 2020

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Biogas contains more than 40% CO2 that can be removed to produce high quality CH4. Recently, CH4 production from CO2 methanation has been reported in several studies. In this study, CO2 methanation of biogas was performed over a 20 wt% Ni-Mg-Al catalyst, and the effects of CO2 conversion rate and CH4 selectivity were investigated as a function of CH4, O2, H2O, and N2 compositions of the biogas. At a gas hourly space velocity (GHSV) of 30,000 h−1, the CO2 conversion rate was ~79.3% with a CH4 selectivity of 95%. In addition, the effects of the reaction temperature (200–450 °C), GHSV (21,000–50,000 h−1), and H2/CO2 molar ratio (3–5) on the CO2 conversion rate and CH4 selectivity over the 20 wt% Ni-Mg-Al catalyst were evaluated. The characteristics of the catalyst were analyzed using Brunauer–Emmett–Teller surface area analysis, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The catalyst was stable for approximately 200 h at a GHSV of 30,000 h−1 and a reaction temperature of 350 °C. CO2 conversion and CH4 selectivity were maintained at 75% and 93%, respectively, and the catalyst was therefore concluded to exhibit stable activity.

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Section: Effect Of Initial Oxygen Concentration On Co2 Conversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CO2 Methanation of Biogas over 20 wt% Ni-Mg-Al Catalyst: on the Effect of N2, CH4, and O2 on CO2 Conversion Rate

et al. 2020

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“…As zirconium dioxide (ZrO 2 ) has high thermal stability, excellent redox properties and an acid-basic site on its surface, it is a good catalyst and support material for various reactions, such as CO 2 methanation [3,4], water-gas shift [5,6], NH 3 selective catalytic reduction [7,8], and hydrodeoxygenation [9,10]. Especially, the transition metal oxide dispersed onto the surface of ZrO 2 exhibits powerful activity for NO reduction.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Reaction Mechanism of NO–CO on the ZrO2 (110) and (111) Surfaces

Cao

Zhang

Wang

et al. 2019

IJMS

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Due to the large population of vehicles, significant amounts of carbon monoxide (CO), nitrogen oxides (NOx), and unburned hydrocarbons (HC) are emitted into the atmosphere, causing serious pollution to the environment. The use of catalysis prevents the exhaust from entering the atmosphere. To better understand the catalytic mechanism, it is necessary to establish a detailed chemical reaction mechanism. In this study, the adsorption behaviors of CO and NO, the reaction of NO reduction with CO on the ZrO2 (110) and (111) surfaces was performed through periodic density functional theory (DFT) calculations. The detailed mechanism for CO2 and N2 formation mainly involved two intermediates N2O complexes and NCO species. Moreover, the existence of oxygen vacancies was crucial for NO reduction reactions. From the calculated energy, it was found that the pathway involving NCO intermediate interaction occurring on the ZrO2 (110) surface was most favorable. Gas phase N2O formation and dissociation were also considered in this study. The results indicated the role of reaction intermediates NCO and N2O in catalytic reactions, which could solve the key scientific problems and disputes existing in the current experiments.

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“…For instance, MgO and ZrO 2 were investigated for their capacities to improve the catalytic activity and selectivity of heterogeneous catalysts. [24][25][26][27] In general, CeO 2 has acted as an electronic and structural promoter to enhance the performance of Ni-based catalysts by reinforcing the thermal stability, and improving the exchange of oxygen species as well as the uniform distribution of metals over the catalyst. [28][29][30] Here, we describe a Ni-modied catalyst loaded on an Al 2 O 3 -CeO 2 support through a one-pot sol-gel method, and demonstrate its activity for the hydrogenation of CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Ni nanocatalysts supported on mesoporous Al₂O₃–CeO₂ for CO₂ methanation at low temperature

Lin

et al. 2020

RSC Adv.

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Enhanced low-temperature performance of CO2 methanation over mesoporous Ni/Al2O3-ZrO2 catalysts

Cited by 224 publications

References 56 publications

CO2 Methanation of Biogas over 20 wt% Ni-Mg-Al Catalyst: on the Effect of N2, CH4, and O2 on CO2 Conversion Rate

CO2 Methanation of Biogas over 20 wt% Ni-Mg-Al Catalyst: on the Effect of N2, CH4, and O2 on CO2 Conversion Rate

Catalytic Reaction Mechanism of NO–CO on the ZrO2 (110) and (111) Surfaces

Ni nanocatalysts supported on mesoporous Al₂O₃–CeO₂ for CO₂ methanation at low temperature

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Enhanced low-temperature performance of CO2 methanation over mesoporous Ni/Al2O3-ZrO2 catalysts

Cited by 224 publications

References 56 publications

CO2 Methanation of Biogas over 20 wt% Ni-Mg-Al Catalyst: on the Effect of N2, CH4, and O2 on CO2 Conversion Rate

CO2 Methanation of Biogas over 20 wt% Ni-Mg-Al Catalyst: on the Effect of N2, CH4, and O2 on CO2 Conversion Rate

Catalytic Reaction Mechanism of NO–CO on the ZrO2 (110) and (111) Surfaces

Ni nanocatalysts supported on mesoporous Al2O3–CeO2 for CO2 methanation at low temperature

Contact Info

Product

Resources

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Ni nanocatalysts supported on mesoporous Al₂O₃–CeO₂ for CO₂ methanation at low temperature