The Preparation Of Catalyst For Methyl Oleate Hydrogenation And Research Of Catalyst Properties

Fatty alcohol is the main raw material to produce surfactants,solubilizer,dispersant,wetter and other fine chemicals,which is widely used in cleaning products,cosmetics,medicine,food,plastics antioxidants and other industries.It plays an important role in the national economy for its high additional calue.In this paper,methyl oleate ester was selected as a model reaction for producing fatty alcohol.Firstly,lignin amine loaded palladium catalyst?Lignin-DETA-Pd catalyst?was prepared to catalyze the hydrogenation reaction of fatty acid methyl ester,which is based on the functional polymer complexation noble metal catalysts.By using the stability of the polymer nicelle solution,Pd/F127 catalysts?Palladium catalyst was prepared using F127 micelles as stabilizers?and Pd/P123 catalysts?Palladium nanoparticles catalyst was prepared using P123 micelles as stabilizers?were manufactured in water phase.This paper examined the activity and reusability of catalysts.The properties of catalysts were characterized using the techniques of TEM?Transmission electron microscope?,XRD?X-ray diffraction?,XPS?X-ray photoelectron spectroscopy?and TG?Thermogravimetric?.The results showed that new catalysts not only possessed good stability,uniform particle size and distribution,but also have good catalytic activity and selectivity for hydrogenation reaction of methyl oleate.Lignin-DETA-Pd catalyst was prepared using lignin-DETA as the carrier,loading palladium nanoparticles.The Lignin-DETA-Pd catalyst was used in the hydrogenation of methyl oleate.When the catalytic reaction was carried out at 240? for 10 hours under 7 Mpa using 0.2 g catalyst loading,the hydroxyl value of fatty alcohol reached 171.6 mg KOH.g^-1,iodine value was 60.4 g I2.?100g?^-1.Interestingly,the isolated catalyst phase still has good catalytic activity after five times recycling.The results of TG characterization of Lignin-DETA-Pd catalyst showed that catalyst had good thermal stability within 240?.The analysis of FT-IR?Fourier transform infrared spectroscopy?of Lignin-DETA-Pd catalyst proved that palladium metal particles were combined with lignin amine,formed a stable metal complex catalysts.Pd/F127 was prepared using F127 micelles as stabilizers,stabilizing palladium nanoparticles.Pd/F127 catalyst was used in the hydrogenation of methyl oleate.Under the optimum reaction conditions: reaction temperature 230?,hydrogen pressure 6 MPa,catalyst loading 6.0 g,response time 8 h,the hydroxyl value of fatty alcohol reached 179.6 mg KOH.g^-1,it's iodine value was 9.7 g I2.?100g?^-1.The catalyst were easily separated from the product,in addition the catalyst was effectively recycled,which still had relatively high catalytic activity after five times using.The morphology and dispersion of Pd/F127 catalyst were observed through TEM micrograph.Palladium nanoparticles catalyst was prepared using P123 micelles as stabilizers.Pd/P123 was used in the hydrogenation of methyl oleate,the hydroxyl value of fatty alcohol reached 176.5 mg KOH.g^-1,and the iodine value was 9.8 g I2.?100g?^-1 under the reaction conditions as flows: reaction temperature 210?,reaction time 7 hour,hydrogen pressure 7 MPa,and catalyst loading 0.6 g.And the isolated catalyst phase still had good catalytic activity after five times reusing.The techniques of TEM,XRD,XPS were used to characterize the properties of catalysts.The results suggested that Pd nanoparticles were uniform distribution,and the average particle size was around 1.23 nm.In conclusion,during the conversion of methyl oleate hydrogenation to fatty alcohols,all of three catalysts were respectively showed good catalytic activity and selectivity.Pd/F127 catalyst and Pd/P123 catalyst had better catalytic activity than Lignin-DETA-Pd.In this study,the water was used as solvent,which not only showed green environmental protection,but also easily separation.Additionally these catalysts have better reuse performance.Therefore,these researching achievements provided supports and references for fatty acid methyl ester hydrogenation reaction system.