Issue 19/2019 - Breakthrough in methane/CO2 co-conversion technology

The research on the chemical chain co-conversion technology of methane and carbon dioxide is of great significance
for the chemical utilization of combustible ice and shale gas and the emission reduction of greenhouse gases.
Recently, researchers from the Thermochemical Conversion Research Group of Qingdao Institute of Bioenergy and Bioprocess, Chinese Academy of Sciences have made breakthroughs
in the research of chemical chain co-conversion technology of methane and carbon dioxide.
They developed new oxygen carriers that achieve a stable cycle
of highly selective oxidation of methane and carbon dioxide reduction regeneration.

The researchers first predicted thermodynamically that V2O3, as an intermediate oxide of vanadium, has extremely high syngas selectivity and conversion ability
.
Its selectivity is greater than 99.
7%, and based on the methane conversion capacity as the calculation standard, the conversion capacity of the system can reach more than
420mg/g.
Subsequently, the stable existence
of this intermediate valence state is obtained from the 5-valent state by pre-reduction reaction.
On the basis of preliminary experiments, the researchers further optimized the kinetic reaction performance and redox stability of the system, and successively prepared nano-flower bulb layered Si-V composite oxides and Pt-catalyzed Si-V composite oxides, and finally increased the one-pass conversion of methane to more than 80%, the selectivity of syngas was greater than 99.
5%, and the reduction degree of oxygen carrier was more than 90%, and a stable cycle
of highly selective oxidation of methane and carbon dioxide reduction regeneration was realized.