Catalytic Conversion Of Carbon Dioxide-rich Associated Gas In Marine Oilfield To Syngas

With the rapid growth of the global economy,the consumption of fossil fuels is increasing,and the large amount of carbon dioxide emissions has greatly increased the greenhouse effect.Therefore,the recycling and reuse of carbon dioxide has become the focus of governments and people.The CO₂-rich associated gas in marine oilfie lds contains a large amount of CO2 and methane.Carbon dioxide reforming of methane can utilize CO₂ and methane to produce syngas?H₂/CO?,which is an effective way to utilize CO₂-rich associated gas resources.In this paper,a series of nickel-based catalysts were prepared by solution combustion and impregnation methods and used for carbon dioxide reforming of methane.The main research contents and results are as follows:?1?A series of Ni-SiO₂-SC catalysts were prepared by solution combustion method.The effect of Ni content on the performance of the catalyst was investigated.It was found that the activity of the catalyst increased with the increase of Ni content.But the higher the Ni content,the more carbon is deposited in the catalyst.?2?A series of Ni-La₂O₃-SC catalysts were prepared by solution combustion method using La₂O₃ as the carrier.The results show that the catalysts with different Ni contents have higher activity,and it is also found that the addition of La₂O₃ can improve the activity of the catalyst.?3?A series of Ni-La2O3-SiO2-SC and Ni-La2O3-SiO2-IM catalysts were prepared by solution combustion method and impregnation method,respectively.It was found that the catalyst Ni-La₂O₃-SiO₂-SC prepared by the solution combustion method has good activity and stability,and the carbon content in less than 2%.The Ni-La₂O₃-SiO₂-IM catalyst prepared by the impregnation method has good activity,but the carbon content in 50 hours is more than 10%.The catalyst characterization and performance test results show that solution combustion method can be used to coat Ni particles in amorphous La₂O₃,effective ly inhibiting the sintering of Ni particles and carbon deposition,and effectively improving the stability and anti-carbon deposition performance of the catalyst.Compared with the Ni-La₂O₃-SiO₂-IM catalyst prepared by impregnation method,the Ni-La₂O₃-SiO₂-SC catalyst prepared by solution combustion showed better activity and stability,and had a better application prospect.