Photocatalytic and Thermocatalytic Conversion of Methane

Solar RRL ◽  
2021 ◽  
pp. 2000596
Author(s):  
Zhonghua Li ◽  
Zhiguo Yi ◽  
Zhaosheng Li ◽  
Zhigang Zou
Keyword(s):  
Conversion Of Methane ◽  
Thermocatalytic Conversion

Research Progress on Photocatalytic Activation of Methane to Methanol

2021 ◽  
Author(s):  
Yu dong Tian ◽  
Lingyu Piao ◽  
Xiaobo Chen
Keyword(s):  
Thermodynamic Equilibrium ◽  
Research Progress ◽  
Conversion Of Methane ◽  
Thermocatalytic Conversion

The conversion of methane (CH4) to methanol (CH3OH) has attracted much attention in catalysis. However, the traditional thermocatalytic conversion of CH4 to CH3OH is largely restricted by the thermodynamic equilibrium...

scholarly journals Unraveling the Activity of Iron Carbide Clusters Embedded in Silica for Thermocatalytic Conversion of Methane

2020 ◽  
Author(s):  
Gopal K. Dixit ◽  
Manish Kumar ◽  
Ankita Katiyar ◽  
Antonius P. J. Jansen ◽  
Alexander van Bavel ◽  
...  
Keyword(s):  
Partial Pressure ◽  
Density Functional ◽  
High Selectivity ◽  
Iron Carbide ◽  
Methyl Radical ◽  
Reaction Conditions ◽  
Silica Substrate ◽  
Rate Determining Step ◽  
Conversion Of Methane ◽  
Thermocatalytic Conversion

<p>Isolated Fe-sites on silica substrate have recently been reported for direct and non-oxidative</p> <p>conversion of gaseous methane with high selectivity. The activated catalyst was proposed to be</p> <p>FeC2 cluster embedded in silica. Using a combination of density-functional theoretic methods</p> <p>and micro-kinetic modeling, we show that under the same reaction conditions (1223 K , 1 atm)</p> <p>FeC2 sites convert to FeC3 and the latter is instead responsible for the observed activity. We</p> <p>investigate the detailed mechanism of conversion of methane to methyl radical and hydrogen</p> <p>on FeC3@SiO2 under different conditions of methane partial pressure. We find that methyl</p> <p>radical evolution is the rate-determining step for the overall conversion. Our calculations also</p> <p>indicate that the conversion of embedded FeC3 to FeC4 competes with methyl radical evolution</p> <p>from the active catalyst. However, due to the higher stability of FeC3 sites, we anticipate that</p> <p>formation of higher carbides can be inhibited by controlling the hydrogen partial pressure.</p>

scholarly journals Unraveling the Activity of Iron Carbide Clusters Embedded in Silica for Thermocatalytic Conversion of Methane

2020 ◽  
Author(s):  
Gopal K. Dixit ◽  
Manish Kumar ◽  
Ankita Katiyar ◽  
Antonius P. J. Jansen ◽  
Alexander van Bavel ◽  
...  
Keyword(s):  
Partial Pressure ◽  
Density Functional ◽  
High Selectivity ◽  
Iron Carbide ◽  
Methyl Radical ◽  
Reaction Conditions ◽  
Silica Substrate ◽  
Rate Determining Step ◽  
Conversion Of Methane ◽  
Thermocatalytic Conversion

<p>Isolated Fe-sites on silica substrate have recently been reported for direct and non-oxidative</p> <p>conversion of gaseous methane with high selectivity. The activated catalyst was proposed to be</p> <p>FeC2 cluster embedded in silica. Using a combination of density-functional theoretic methods</p> <p>and micro-kinetic modeling, we show that under the same reaction conditions (1223 K , 1 atm)</p> <p>FeC2 sites convert to FeC3 and the latter is instead responsible for the observed activity. We</p> <p>investigate the detailed mechanism of conversion of methane to methyl radical and hydrogen</p> <p>on FeC3@SiO2 under different conditions of methane partial pressure. We find that methyl</p> <p>radical evolution is the rate-determining step for the overall conversion. Our calculations also</p> <p>indicate that the conversion of embedded FeC3 to FeC4 competes with methyl radical evolution</p> <p>from the active catalyst. However, due to the higher stability of FeC3 sites, we anticipate that</p> <p>formation of higher carbides can be inhibited by controlling the hydrogen partial pressure.</p>

Unraveling the activity of iron carbide clusters embedded in silica for thermocatalytic conversion of methane

2021 ◽  
Author(s):  
Gopal Krishna Dixit ◽  
Manish Kumar ◽  
Ankita Katiyar ◽  
Antonius P.J. Jansen ◽  
Sander van Bavel ◽  
...  
Keyword(s):  
High Selectivity ◽  
Iron Carbide ◽  
Silica Substrate ◽  
Conversion Of Methane ◽  
Fe Sites ◽  
Thermocatalytic Conversion

Isolated Fe-sites on silica substrate have recently been reported for direct and non-oxidative conversionof gaseous methane with high selectivity. The activated catalyst was proposed to be FeC2 clusterembedded in silica....

Synthesis of dispersed mesoporous powders solid solution Zr0.88Ce0.12O2 for catalyst carrier of the conversion of methane to synthesis –gas

2020 ◽  
pp. 73-83
Author(s):  
L. V. Morozova ◽  
◽  
I. A. Drozdova ◽  
Keyword(s):  
Solid Solution ◽  
Total Pore Volume ◽  
Nitrogen Adsorption ◽  
Primary Crystal ◽  
X Ray ◽  
Catalyst Carrier ◽  
Conversion Of Methane ◽  
Deposition Processes ◽  
Zirconia Oxide ◽  
Coprecipitation Of Hydroxides

The xerogels in the system 0.88 mol.% ZrO2 − 0.12 mol.% CeO2 were obtained by the method of coprecipitation in a neutral (pH = 7) and slightly alkaline (pH = 9) medium under the influence of ultrasound with the size of the agglomerates 70 – 230 nm. It is shown that the coprecipitation of hydroxides of zirconium and cerium at pH = 9 with the use of ultrasonic treatment facilitates the formation of a primary crystal is symbolic of the particles in the xerogel, whose size is ~ 5 nm, whereas the xerogel synthesized in a neutral environment consists only of the x-ray amorphous phase. The effect of pH-precipitation on deposition processes of dehydration of the xerogels and crystallization solid solution based on zirconia oxide in the metastable pseudocubic modification (с′-ZrO2) was discovered. It was found that in the temperature range 500 – 800 °C there is a phase transition с′-ZrO2 → t-ZrO2, the size of the crystallites of the formed tetragonal solid solutions is 8 and 11 nm. The method of low-temperature nitrogen adsorption were investigated dispersion properties and characteristics of the pore structure of the powders of the solid solution Zr0.88Ce0.12O2. It is determined that the specific surface area of t-ZrO2 samples obtained after firing at 800 °C is 117 and 178 m2/g, the total pore volume reaches 0.300 − 0.325 cm3/g, the pore size distribution is monomodal and is in the range of 2 − 8 nm. The effect of thermal “aging” at a temperature of 800 °C (40 h) on the structure and dispersion of the solid solution t-ZrO2 powders was studied.

Catalytically active coatings for steam reforming systems: synthesis and catalytic properties

2019 ◽  
pp. 96-105
Author(s):  
M. L. Shishkova ◽  
N. V. Yakovleva
Keyword(s):  
Catalytic Properties ◽  
Raw Materials ◽  
Cold Gas Dynamic Spraying ◽  
Hydrogen Fuel ◽  
Functional Coatings ◽  
Science And Engineering ◽  
Powder Mixtures ◽  
Conversion Of Methane ◽  
Catalytically Active ◽  
Metal Support

The paper considers science and engineering aspects of catalytically active compositions creation as regards immobilized catalysts for reforming hydrocarbon raw materials into hydrogen fuel. The authors investigate synthesis of catalytic powder mixtures and manufacturing of functional coatings by supersonic cold gas dynamic spraying. Research results in the field of creation of catalysts for steam conversion of methane to hydrogenous fuel on the metal support (Cr15Al15 tape support) are given. Composite powder mixtures (Ni–Al–Al(OH)3– Ca(OH)2–Mg(OH)2) were used as starting materials.

Photocatalytic Conversion of Methane: Recent Advancements and Prospects

2021 ◽  
Author(s):  
Qi Li ◽  
Yuxing Ouyang ◽  
Hongliang Li ◽  
Liangbing Wang ◽  
Jie Zeng
Keyword(s):  
Conversion Of Methane
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