Research Of Strcture-Activity Relationship Of Co-Cu Nano-Bimetallic Catalyst For Hydrogen Transfer Of Natural Oil To Fatty Alcohol

Fatty alcohols usually refer to C6-C22 linear fine chemicals that contain only one alcoholic hydroxyl group,and are widely used as surfactants in daily use,food,agriculture and other fields.Fatty alcohols are divided into two categories: synthetic and natural fatty alcohols.The raw material of synthetic alcohol,petroleum,is a non-renewable resource,and its development is restricted due to the complicated process,large investment and energy consumption.The raw materials of natural fatty alcohols are renewable animal and vegetable fats and oils.The industrial catalysts used in the production of fatty alcohols from animal and vegetable fats and oils are mainly copper-chromium,which catalyzes the production of fats and oils at 200-400 °C and 20-30 MPa.Natural alcohol.Although the copper-chromium catalyst has excellent activity for the production of fatty alcohols,due to the harsh reaction conditions,and the use of chromium will cause serious harm to the human body or cause environmental pollution.For this reason,research on efficient,energy-saving and green catalytic natural fatty alcohol synthesis system has become a research hotspot.In this thesis,a Co-Cu nano bimetallic catalyst system was developed to catalyze the hydrogen transfer of fatty acids or fats to prepare fatty alcohols.Firstly,using stearic acid as the model compound,the effects of catalyst Co/Cu molar ratio and heat treatment reduction temperature on hydrogenation of stearic acid to hydrogenation to prepare fatty alcohol were optimized.The experimental results show that when the Co/Cu molar ratio is 1/2 and the catalyst reduction temperature is 500 °C,the reaction process parameters such as the temperature is 230°C,the reaction time is 3.5 h,the catalyst dosage is 100 mg,and isopropyl alcohol is used as the solvent.The conversion rate of stearic acid is 99%,the yield of stearyl alcohol reaches 94.7%,and the catalyst can still maintain good catalytic performance after 4 times of repeated use.The catalyst was characterized by high-resolution electron transmission microscopy(HRTEM),X-ray diffraction(XRD),Cu and Co particles were evenly dispersed on the surface of the carrier,and Cu Co Al O spinel formed by Cu Co Al O composite nano-catalyst thermally reduced at 500 °C,is the main active component.The synergistic effect of Cu and Co is the key to the efficient preparation of fatty alcohols by stearic acid catalyzed by Co-Cu nano-bimetals.Finally,the reaction substrate is expanded from stearic acid to Jatropha oil and olive oil.The catalytic system also has good catalytic effect.Under the optimal reaction conditions,the yield of fatty alcohol prepared by Jatropha oil is 88.5%,the yield of fatty alcohol from olive oil is 89.2%.The catalytic system does not require cumbersome multi-step reaction steps in the process of catalyzing hydrogen transfer of fats and oils under the condition of no external hydrogen,and has the advantages of being green,safe,efficient,and cheap.Thecatalytic hydrogenation system for preparing fatty alcohols provides a theoretical reference for the conversion of inferior or outdated oils into fatty alcohol surfactants with higher added value,and realizing the high value of waste resources.