A preparation method and application of a catalyst that can be used for the hydrogenolysis of glucose to prepare low-carbon dihydric alcohols

Abstract

The invention discloses a preparation method of a catalyst that can be used for glucose hydrogenolysis to prepare low-carbon dihydric alcohols; firstly, the catalyst carrier is pretreated, and then the pretreated catalyst carrier is impregnated with an auxiliary metal solution; The catalyst carrier of the auxiliary metal is impregnated with an active metal solution; finally, the hydrogen is reduced to obtain a catalyst that can be used for the hydrogenolysis of glucose to prepare low-carbon diols; the preparation method is simple to operate, low in cost, and high in efficiency. It can regulate the location and degree of glucose carbon chain disconnection and has high activity and high selectivity to low-carbon diols. The invention also discloses the application of the catalyst, which can be used to catalyze the hydrogenolysis reaction of glucose, especially can be used to catalyze the hydrogenolysis reaction of glucose in high-pressure continuous fixed bed, batch reactor and high-gravity rotary bed.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a preparation method and application of a catalyst which can be used for hydrogenolysis of glucose to prepare low-carbon dihydric alcohols. Background technique [0002] With the depletion of petrochemical resources and the increasingly severe environmental pollution, the development and use of biomass energy has a profound impact on energy consumption, environmental protection and economic benefits. Catalysts currently used for biomass conversion are usually prepared by ordinary impregnation method. Although this preparation method is easy to operate, it has different particle sizes, uneven dispersion, and low metal surface utilization, resulting in high conversion efficiency and selectivity. Not high, the catalytic effect is not ideal. In addition, in order to improve the catalytic effect, most of them need to add acid / alkali as a promoter, which will cause corr...

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Problems solved by technology

[0007] 4. A ruthenium catalyst, its preparation method and its application in the synthesis of tetrahydrofurfuryl alcohol, CN102489315A; first add carrier TiO to the aqueous solution containing ruthenium salt or to the aqueous solution containing ruthenium salt and metal promoter salt 2 , and then add potassium borohydride or hydrazine hydrate solution to the mixed solution to obtain a catalyst; the catalyst is used in the one-step hydrogenation of furfural to synthesize tetrahydrofurfuryl alcohol; the yield can be greater than 99%; but sodium sulfate needs to be added as a solvent during the preparation process Hydrothermal treatment, the introduction of sodium ions will affect the catalyst performance

[0008] 6. A preparation method of activated carbon-supported noble metal catalyst, CN102658133A; by treating activated carbon in ethylenediaminetetraacetic acid disodium salt solution, and then stirring in nitrate solution or chloride solution solution containing noble metal, adding alkaline Adjust the pH value of the aqueous solution and continue to stir, and finally reduce it with hydrazine hydrate or hydrogen to obtain a catalyst; this catalyst can be used to catalyze hydrogenation to synthesize DSD acid; And the use of alkaline solutions such as sodium hydroxide and potassium hydroxide to adjust the pH value of the reaction, the metal ions introduced will affect the performance of the catalyst

[0009] 7. Nickel / ruthenium catalyst and its method for water phase reaction, CN1246077; the catalyst is a particle formed from a porous carrier on which a certain amount of reduced nickel metal catalytic phase providing catalyst activity is deposited as the first dispersed phase , the particles also have a ruthenium metal added to the porous carrier as the second dispersed phase, the amount of which can effectively make the nickel metal catalyst phase anti-agglomeration or sintering, prolonging the life of the catalyst in the hydrogenation reaction; but The reaction conditions adopted are 350°C and 340atm, the reaction temperature is slightly higher and the pressure is higher, resulting in energy consumption and safety hazards

[0012] 1, the preparation method of dibasic alcohol, CN101781166; Under alkaline conditions, use Raney nickel, ruthenium / carbon, nickel / ruthenium or copper oxide-zinc oxide as hydrogenolysis catalyst to hydrogenolyze glucose; Corrosion equipment, reaction at 10MPa ~ 13MPa will cause safety hazards

[0013] 2. The preparation method of dihydric alcohol, CN101781171; under alkaline conditions, use nickel-molybdenum-copper doped with chromium or iron, tin, and zinc as a hydrogenolysis catalyst to hydrogenolyze glucose; easy-to-corrosion equipment under alkaline conditions , the reaction at 10MPa ~ 13MPa will cause safety hazards

[0016] 5, the preparation method of dibasic alcohol, CN101781170; use the mixture of sorbitol and mannitol as raw material, the nickel-molybdenum-copper doped with chromium or iron, tin, zinc is used as hydrogenolysis catalyst to hydrogenolyze mixed sugar alcohol; catalyst amount is 3% to 10% of the total weight of the water phase, if the amount is too large, it will easily cause waste of resources and water pollution

[0017] 6. The synthesis method of dihydric alcohols and polyols, CN101781168; using sucrose as raw material, nickel-molybdenum-copper doped with chromium or iron, tin, zinc as a hydrogenolysis catalyst to hydrogenolyze sucrose; the amount of catalyst is 15% of the mass of sucrose ~30%, if the usage is too large, it will easily cause waste of resources and water pollution

[0018] 7. The synthesis method of dibasic alcohols and polyhydric alcohols, CN101781167; use sucrose as a raw material, and use Raney nickel, ruthenium / carbon, nickel / ruthenium or copper oxide-zinc oxide as a hydrogenolysis catalyst to hydrogenolyze sucrose; 15% to 30%, if the usage is too large, it will easily cause waste of resources

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