Comparative study on oxidation of methane to ethane and ethylene over Na2WO4–Mn/SiO2 catalysts prepared by different methods

Zastosowanie drukowania 3d do modelowania struktury kanałów w monolitycznych katalizatorach dedykowanych dla procesu utleniającego sprzęgania met

“…General variations of methane conversion and selectivity to C 2 hydrocarbons obtained in this work are in accordance with literature, e.g. the increase of selectivity to C 2 is usually accompanied by the decrease of methane conversion [14][15][16][17][18]. The increase of CH 4 conversion is due to the fact that at higher temperatures, more methane molecules have sufficient energy to reduce the activation energy in the presence of the catalyst (reaching the maximum at about 800°C in the case of Mn-Na 2 WO 4 catalysts); at lower CH 4 :O 2 molar ratios, more oxygen is available for the reaction and at lower helium dilution of the reaction gas (lower GHSV), the contact time with the catalyst is longer.…”

Synthesis of Na2WO4-Mn Supported YSZ as a Potential Anode Catalyst for Oxidative Coupling of Methane in SOFC Reactor

“…Catalytic Performance of Catalysts Table 3 summarizes the catalytic performances of different catalysts after 90 min of reaction at steady state under GHSV of 15000 ml g -1 h -1 , 800°C and a molar ratio of CH4/O2 of 4:1 [6,20]. For Na-W-Mn/SiO2 catalyst, 12.0% CO selectivity, 12.9% CO2 selectivity and 69.0% C2 selectivity at 28.5% CH4 conversion are obtained, which are in agreement with several reports [21][22][23][24].…”

“…Among several catalysts, 5wt%Na2WO4-2wt%Mn/SiO2 offers a good performance in OCM with 20% of methane conversion and 80% of C2 + selectivity [3,[5][6][7]]. Lunsford and co-workers [8][9] reported that Na-O-Mn species were responsible for an activation of methane, in which Mn was an active component, Na provided selectivity, and W was required to stabilize the catalyst.Afterwards, Lapeña-Rey et al investigated OCM in SOFC using YSZ as a solid electrolyte, 5wt%Na2WO4-2wt%Mn/SiO2 was used as an anode catalyst.…”

Development of Ce/ La0.25Sr0.75Cr0.5Mn0.5O3 Anode Catalyst for Further Application in Solid Oxide Fuel Cell Typed Reactor

“…S.W. Tao and co-worker reported the increasing in electrical conductivity of doping on the Mn site of LaSrMnO 3 . Moreover doped-chromium on Mn site is suitable for high temperature operation (750-900°C) because Cr doped LaSrMnO 3 played a vital role in increasing resistance to coking (as well as raising sulphur tolerance) [16].…”

“…The selectivity to C2 hydrocarbon decreases with increasing methane conversion. In addition, the yield of C2 hydrocarbons achieved in a fixed-bed reactor (FBR) was limited to about 20-25% due to to the presence of undesired complete oxidation in the gas phase and partially on the catalyst surface [3], [4]. In the last 25 years, numerous works have been reported and several innovative approaches have been proposed, including the use of solid electrolyte membrane reactors [5], [6].…”