Perovskite Composite Oxides Catalytic Bagasse High-Pressure Liquefaction Research Study On Catalytic Reaction Of Biomass High-Pressure Liquefaction

High pressure liquefaction is the main component of biomass?cellulose, hemicellulose and lignin? in the depolymerization process, at high temperature, high pressure conditions, the depolymerization product through dehydroxylation, decarboxylation, dehydration and deoxygenation formed small molecule compounds, small molecule compounds condensed in the role of catalyst, reaction of cyclization, esterification formed new compounds.This paper focuses on the distribution of products in the high-pressure bagasse liquefaction process and the effects by catalytic properties of the different methods of perovskite composite oxide, doping ions and doping of category A and B site.La_1-xPr_xNiO₃ composite oxide has better catalytic activity in the high-pressure liquefaction process bagasse, after Pr³⁺ partly replacing La³⁺, the peak strength of La_1-xPr_xNiO₃ composite oxide catalyst enhanced, diffraction peak shifts to a wide angle diffraction angle direction, the micro morphology structure was more loose, catalytic reaction contact area increased, the reduction peak migrated to the direction of high temperature the reduction peak area increased, surface oxygen species conductivity enhanced. With Pr species content increases, the residue rate reduced from 30.82% to 24.86%, Liquefied oil yield enhanced from 41.67% to 46.37%. At the same time, the product of large relative molecular mass in liquefied product decreased and the product of small relative molecular mass increased. The product is mainly furfural?phenol. La_0.6Pr_0.4NiO₃ composite oxide catalyst performed better catalyst stability, strong anti-carbon deposition, it showed that it is more conducive to catalytic bagasse high-pressure liquefaction reaction.Cationic surfactant CTAB as organic template agent, mesoporous La_0.6Pr_0.4NiO₃ perovskite-type oxide were synthesized by hydrothermal method,sol-gel method,soft template method and co-precipitation method, the crystalline structures,superficial area,pore characteristics and surface properties were characterized by XRD,TEM,FIIR,H₂-TPR,CO₂-TPD and Low temperature N₂ adsorption- stripping, at the same time, the catalytic performances of different preparation methods for composite oxide and liquefaction product distributions in the process were studied. The results showed that the microstructure of mesoporous La_0.6Pr_0.4NiO₃ perovskite-type oxide catalysts were synthesized by co-precipitation method is porous structure, larger specific surface area, is 21.36 m2·g-1, the most probable pore diameter is 22.64 nm and it has better catalytic activity on bagasse high-pressure liquefaction, at the same time, the liquefaction products of small relative molecular mass increased.The product distribution is mainly triethyl citrate,acid,phenol. The residue is 13.92% and liquefied oil yield is 58.21%.Mesoporous La_0.6A_0.4NiO₃?A=Ce,Sr,Y,Nd,Pr? perovskite-type oxide were,synthesized by co-precipitation method,the crystalline structures,surface topography, superficial area?pore size distribution and surface properties were characterized by XRD,SEM,FI-IR,BET and temperature programmed technology, at the same time, the catalytic performances of A-site ion replaced of mesoporous La_0.6A_0.4NiO₃ perovskite and liquefaction product distributions in the process were studied. The results showed that A-site ions doping with different degrees of crystal, Pr³⁺can better replaced of La³⁺ with isomorphous substitution, specific surface area is 21.36 m2·g-1,and the most probable pore diameter is 22.64 nm, it has stronger surface oxygen species and basic center. Liquefied oil yield is 58.21% and the residue is 13.92% on bagasse high-pressure liquefaction reaction, liquefied products are mainly acetyl tributyl citrate,butyl citrate,phenol,ethylphenol. Also investigated the B bit different ion species on the catalytic properties of perovskite composite oxide and its influence on liquefied oil yield and distribution of product, In the B position of La_0.6Pr_0.4BO₃ adopted Mn²⁺, Cu²⁺, Co²⁺, Fe³⁺, Ni²⁺ ions, Because of the difference in ionic radius, resulting in different degree of crystallinity of the various perovskite complex oxide, La0.6Pr0.4BO3 has high degree of crystallinity, reasonable pore size distribution, the specific surface area is 21.98 m2·g-1, the most probable pore size is 32.27 nm, Liquefied oil yield is 59.68% and the residue is 12.62% on bagasse high-pressure liquefaction reaction. At the same time, the liquefaction products of small relative molecular mass increased,The product is mainly ATBC,phenol,benzyl alcohol,phthalic guaiacol.