The insights into chlorine doping effect on performance of ceria supported nickel catalysts for selective CO methanation

Konishcheva, M.V.; Потемкин, Д.И.; Snytnikov, P.V.; Стонкус, О. А.; Belyaev, V. D.; Sobyanin, V. A.

doi:10.1016/j.apcatb.2017.09.038

Cited by 46 publications

(43 citation statements)

References 35 publications

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“…Figure 1c shows the in situ IR spectrum of Ni/SiO 2 , which was exposed to 1 mbar CO at RT. Three apparent IR bands exist in the spectrum: (a) CO adsorption on the NiO or SiO 2 surface at 2195 cm −1 , with a slight blue-shift compared with the gas phase CO; (b) CO adsorption on the top sites of the surface Ni at 2091 cm −1 , with a slight red-shift compared with the gas phase CO; (c) CO adsorption on the bridge sites of surface Ni at 1942 cm −1 ,with a large red-shift compared with the gas phase CO [2]. Two more bands in the spectrum, including the vibration of gaseous CO as indicated by the steep trough centered at 2143 cm −1 , and a band at 2060 cm −1 , had been overshadowed by other intense bands, such as the asymmetric shape of the band at 2091 cm −1 .…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…With the increasing global demand for clean energy sources, natural gas, the main ingredient of methane (CH 4 ), is promising as a clean energy source, which replaces conventional fossil fuels that have resulted in a range of environmental issues [1,2]. Carbon monoxide (CO) methanation is an ideal way to produce CH 4 from coal, and has proven to be one of the most effective ways for the clean utilization of coal [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Clarification of Active Sites at Interfaces between Silica Support and Nickel Active Components for Carbon Monoxide Methanation

Zhang

Tian

et al. 2018

Catalysts

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Identification of active site is critical for developing advanced heterogeneous catalysis. Here, a nickel/silica (Ni/SiO2) catalyst was prepared through an ammonia-evaporation method for CO methanation. The as-obtained Ni/SiO2 catalyst shows a CO conversion of 96.74% and a methane selectivity of 93.58% at 623 K with a weight hourly space velocity of 25,000 mL·g−1·h−1. After 150 h of continuous testing, the CO conversion still retains 96%, which indicates a high catalyst stability and long life. An in situ vacuum transmission infrared spectrum demonstrates that the main active sites locate at the interface between the metal Ni and the SiO2 at a wave number at 2060 cm−1 for the first time. The interesting discovery of the active site may offer a new insight for design and synthesis of methanation catalysts.

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Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clarification of Active Sites at Interfaces between Silica Support and Nickel Active Components for Carbon Monoxide Methanation

Zhang

Tian

et al. 2018

Catalysts

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“…In Figure 1, the addition of Mg did not exhibit a significant effect on CO 2 conversion in the CO 2 methanation, which may be due to the formation of the stronger interaction between Ni and Mg oxides, leading to the decreased amount of nickel-active sites available and thus the catalytic performance [34]. However, the addition of La, Ce and Mn increased the CO 2 conversion of Ni/bentonite-U catalysts at low temperature, which might be due to the fact that the addition of these three metals could promote the structure and performance of the catalysts, form oxygen vacancies, change the interaction between the active component Ni and the support, and the CO 2 could be activated by the basic sites formed between the metal and the Ni, which further improved the catalytic activity of the catalysts [35][36][37][38][39][40]. Among these five metals, the addition of Mn had the most significant improvement with regards to regards to catalyst activity.…”

Section: Effects Of Metal Modification On Co 2 Methanation On Ni/bentmentioning

confidence: 99%

Mn Modified Ni/Bentonite for CO2 Methanation

et al. 2018

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To enhance the low-temperature catalytic activity and stability of Ni/bentonite catalyst, Ni-Mn/bentonite catalyst was prepared by introducing Mn into Ni/bentonite catalyst and was used for CO 2 methanation. The results indicated that the addition of Mn enhanced the interaction between the NiO and the bentonite carrier, increased the dispersion of the active component Ni and decreased the grain size of the active component Ni, increased the specific surface area and pore volume of the Ni/bentonite catalyst, and decreased the average pore size, which suppressed the aggregation of Ni particles grown during the CO 2 methanation process. At the same time, the Mn addition increased the amount of oxygen vacancies on the Ni/bentonite catalyst surface, which promoted the activation of CO 2 in the methanation reaction, increasing the low-temperature activity and stability of the Ni/bentonite catalyst. Under the reaction condition of atmospheric pressure, 270 • C, V(H 2 ):V(CO 2 ) = 4, and feed gas space velocity of 3600 mL·g cat −1 ·h −1 , the CO 2 conversion on the Ni-Mn/bentonite catalyst with 2wt% Mn was 85.2%, and the selectivity of CH 4 was 99.8%. On the other hand, when Mn was not added, the CO 2 conversion reached 84.7% and the reaction temperature only raised to 300 • C. During a 150-h stability test, the CO 2 conversion of Ni-2wt%Mn/bentonite catalyst decreased by 2.2%, while the CO 2 conversion of the Ni/bentonite catalyst decreased by 6.4%.

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“…The TEM data were in line with SEM data and confirmed that the surface structure of the Ni/Ce/FCA catalyst was similar to that of the powdered chlorinated nickel ceria catalysts CHEMICAL PROBLEMS 2019 no. 2 (17) studied in detail in [24].…”

Section: Experimental Part 21 Catalyst Preparation and Characterizationmentioning

confidence: 99%

Catalysts and Catalytic Processes for the Production of Hydrogen-Rich Gas for Fuel Cell Feeding

Бадмаев¹,

Belyaev²,

Konishcheva³

et al. 2019

Chemical Problems

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The insights into chlorine doping effect on performance of ceria supported nickel catalysts for selective CO methanation

Cited by 46 publications

References 35 publications

Clarification of Active Sites at Interfaces between Silica Support and Nickel Active Components for Carbon Monoxide Methanation

Clarification of Active Sites at Interfaces between Silica Support and Nickel Active Components for Carbon Monoxide Methanation

Mn Modified Ni/Bentonite for CO2 Methanation

Catalysts and Catalytic Processes for the Production of Hydrogen-Rich Gas for Fuel Cell Feeding

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