Study On Hydroformylation Of Olefins By FCC Light Gasoline Catalyzed By Magnetic Ruthenium Catalyst

With the stricter restrictions on olefin content in domestic commercial gasoline standards and the concern about air pollution,it is of practical significance to reduce the olefin content in gasoline,improve gasoline combustion performance and increase gasoline octane number.In this paper,the magnetic base ruthenium catalyst is applied to the FCC light gasoline hydroformylation and olefin reduction reaction,aiming to develop a new FCC light gasoline olefin reduction catalyst system and corresponding process technology.The advantage of the magnetic ruthenium catalyst is that the separation of the catalyst and the product is easy,the energy consumption of the whole reaction is lowered,and the problem of separation by the conventional homogeneous catalysis is effectively avoided.On the one hand,the catalytic properties of homogeneous cobalt-based and rhodium-based catalysts were investigated by using 2-methyl-2-butene in FCC light gasoline as the reactant.The results show that under the optimized reaction conditions,the catalytic system of cobalt acetylacetonate and tributylphosphine has certain catalytic activity for 2-methyl-2-butene,the conversion of olefin reaches 19.43%,and the yield of aldehyde and alcohol reaches 15.16%;in contrast,ruthenium-based catalysts achieve similar catalytic effects under milder conditions.On the other hand,three kinds of ruthenium-doped ferroferric oxide catalysts were prepared by doping and grafting methods.The catalytic performance of FCC light gasoline hydroformylation reaction was studied,and the structure and process conditions of the catalyst were optimized.The Rh/Fe₃O₄ catalyst prepared by the coprecipitation method has a large difference between the actual loading of Rh and the calculated loading,the utilization rate of Rh is very low,and the olefin conversion rate is<10%.The Rh/Fe₃O₄@SiO₂ catalyst prepared by the hydrothermal synthesis method has a uniform spherical shape,but the catalyst has a large particle size and the olefin conversion rate is<15%.Two kinds of magnetic ruthenium catalysts were prepared by grafting amino method.The true load of Rh and the calculated load were very small,and the utilization rate was high.Among them,Fe₃O₄@SiO₂-NH₂-Rh catalyst can obtain better catalytic activity under mild reaction conditions,the olefin conversion rate and aldehyde yield are about 40%,the olefin content is reduced by 16%,but the loss of Rh is very serious..The second layer of SiO₂ is coated on the basis of Fe₃O₄@SiO₂-NH₂-Rh to improve the stability of the catalyst.The olefin conversion rate was reduced to about 33%,the olefin content was reduced by 14 percentage points,but the catalyst could be recycled four times.