| Biomass derivatives such as bioether and bioester have found wide range of applications being used as fuel additives,biosurfactants,etc.The preparation of these compounds requires the activation of H2 as well as the deoxygnation steps.To this end,this thesis focuses on the development of bifunctional catalyst aiming at the hydrodeoxygenation of several biomass platform compounds,namely,furfural and ethyl levulinate.In the first part of the work,a series of Pd/Si O2catalysts with particle sizes ranging from 2.2 to 28 nm were prepared,and their structural properties and catalytic performances in furfural etherification were systematically investigated,revealing that particle size is important for C=C bilayers.Influence of competition between excessive hydrogenation of bonds or C=O double bonds and etherification.The results show that Pd nanoparticles larger than 3 nm are more favorable for one-step reductive etherification.And prepared a Pd/ZSM-5 bifunctional catalyst,which contained Pd nanoparticles larger than 3 nm and reduced the zeolite acidity in the presence of aminoorganosilanes,and successfully combined direct etherification and reductive etherification in one pot.The combination of the method and the method effectively converts the main by-product furfuryl alcohol into ether while inhibiting the occurrence of other side reactions.The second part of the thesis developed a core-shell structure comprising bifunctional Ru@MFI and basic Mg3Si4O9（OH）4.In the first step,Ru was loaded on MFI by a deposition-precipitation method.Next,Ru was encapsulated into MFI framework by-re-crystallization Then,a shell structure comprising Mg3Si4O9（OH）4was prepared by a hydrothermal treatment of Ru@MFI in Mg（NO3）2solution.This method led to the formation of spatially separated Mg3Si4O9（OH）4 and metal Ru sites,which serves as basic active sites and H2active sites,respectively.This bifunctional catalyst showed promising activity in efficient preparation of GVL from levulinate under mild conditions. |
