%0 Journal Article
%T Euro Petrochemistry 2019: Conversion of CH4 into Value-added Chemicals by Plasma-Catalysis-Yanhui Yi-Dalian University of Technology
%A Yanhui Yi
%J Open Journal of Immunology
%D 2020
%X Methane (CH4), the main component of natural gas and shale gas, has a large reservation and wide distribution in the world, and thus it has been considered as an alternative energy source for oil. However, due to high stability (439 kJ/mol C-H bond energy), negligible electron affinity and low polarizability of CH4£¿molecule, catalytic conversion of CH4£¿into value-added chemicals is considered the ¡°holy grail¡± of catalytic chemistry, and thus effective utilization of CH4£¿has attracted much attention. Herein, we report a CH4/NH3£¿plasma reaction promoted by Pt and Cu catalysts for synthesis of hydrocyanic acid (HCN) at low temperature (400£¿oC).£¿ HCN, an important chemical in organic chemistry, is widely used in pesticide, medicine, metallurgy, fuel and polymer, but it is currently produced through Andruddow process (1000-1100£¿oC,£¿ Pt-Rh alloy gauze catalyst), the reaction of CH4, NH3, and O2, or BMA process (1300£¿oC, Pt mesh catalyst), the reaction of CH4£¿and NH3£¿at atmospheric pressure. That is, the plasma catalysis technology has dramatically lowered the reaction temperature for HCN synthesis. We also report a CH4/O2£¿plasma reaction promoted by Ni/Al2O3£¿catalysts for production of CH3OH. Under the conditions of 85a£¿£¿, 2:1 CH4/O2£¿molar ratio, 0.393 s residence time and 30 W discharge power, 66.6 % methanol selectivity is achieved with 6.4 % methane conversion. The Ni/Al2O3£¿catalysts were characterized by TPR, XRD, XPS and HRTEM, and the results show that the production of CH3OH is mainly attributed to the highly dispersed NiO phase which has a strong interaction with Al2O3£¿support. In addition, 0D modelling (ZD-Plaskin) results show that CH3OH is mainly produced through the radical reactions CH4£¿+ O(1D) ¡ú CH3O + H£¿£¿£¿CH3O + H ¡ú CH3OH and CH3O + HCO ¡ú CH3OH + CO

Chemical transformations of CO2£¿into valuea£¿£¿added chemicals and fuels have been regarded as a key element for creating a sustainable lowa£¿£¿carbon economy in the chemical and energy industry. A particularly significant route that is currently being developed for CO2£¿utilization is catalytic CO2£¿hydrogenation. This process can produce a range of fuels and chemicals, including CO, formic acid, methanol, hydrocarbons, and alcohols; however, high H2£¿consumptions (CO2+3£¿H2¡úCH3OH+H2O) and high operating pressures (ca. 30¨C300a£¿£¿bar) are major challenges associated with this process.

Instead of using H2, the direct conversion of CO2£¿with CH4£¿(dry reforming of methane, DRM) into liquid fuels and chemicals (e.g., acetic acid) represents another promising route for both CO2£¿valorization and CH4£¿activation.
%K Yanhui Yi
%K Petrochemistry
%K Chemical Industry
%K Chemistry
%K Chemical Engineering
%K Petroleum Engineering
%U https://www.longdom.org/abstract/euro-petrochemistry-2019-conversion-of-ch4-into-valueadded-chemicals-by-plasmacatalysisyanhui-yidalian-university-of-tec-54027.html