摘要
New supported Raney-Cu catalyst was prepared from pseudo-boehmite powder and copper aluminum alloy powder.It could be used in a continuous-flow fixed-bed reactor and it was also a good catalyst for hydrogenolysis of glycerol to propylene glycol after the two raw materials were processed by the following procedures:molding,drying,calcination,and leaching.XRD,H_2-TPR,as well as SEM technique were employed to study the physicochemical properties of the catalysts,and the hydrogenolysis of glycerol to 1,2-propylene glycol(1,2-PDO)was used as a probe to evaluate the performance of supported skeletal copper catalysts.The test result indicated that CuAl_2 was the main crystal phase of precursor after the dried strips were calcined at 850 ℃ in air.A part of CuAl_2 was oxidized to α-Al_2 O_3,which was the main contributor to the strength of Raney-Cu/Al_2 O_3, while the remaining CuAl_2 was converted to active skeletal copper after the leaching process.The effects of reaction temperature,hydrogen pressure,LHSV,hydrogen-oil ratio,glycerol concentration,and alkaline additives on the catalytic performance were studied in water or ethanol,respectively.Conversion of glycerol and selectivity of 1,2-PDO were 30.9% and 91.4% in water,or 99.0% and 73.6% in the ethanol system,respectively,when the reaction was performed at a temperature of 215 ℃,a H_2 pressure of 3 MPa,a LHSV of 1.0 h~(-1),a hydrogen-oil ratio of 500,and a glycerol concentration of 20%(ethyl alcohol solution).
New supported Raney-Cu catalyst was prepared from pseudo-boehmite powder and copper aluminum alloy powder.It could be used in a continuous-flow fixed-bed reactor and it was also a good catalyst for hydrogenolysis of glycerol to propylene glycol after the two raw materials were processed by the following procedures:molding,drying,calcination,and leaching.XRD,H_2-TPR,as well as SEM technique were employed to study the physicochemical properties of the catalysts,and the hydrogenolysis of glycerol to 1,2-propylene glycol(1,2-PDO)was used as a probe to evaluate the performance of supported skeletal copper catalysts.The test result indicated that CuAl_2 was the main crystal phase of precursor after the dried strips were calcined at 850 ℃ in air.A part of CuAl_2 was oxidized to α-Al_2 O_3,which was the main contributor to the strength of Raney-Cu/Al_2 O_3, while the remaining CuAl_2 was converted to active skeletal copper after the leaching process.The effects of reaction temperature,hydrogen pressure,LHSV,hydrogen-oil ratio,glycerol concentration,and alkaline additives on the catalytic performance were studied in water or ethanol,respectively.Conversion of glycerol and selectivity of 1,2-PDO were 30.9% and 91.4% in water,or 99.0% and 73.6% in the ethanol system,respectively,when the reaction was performed at a temperature of 215 ℃,a H_2 pressure of 3 MPa,a LHSV of 1.0 h~(-1),a hydrogen-oil ratio of 500,and a glycerol concentration of 20%(ethyl alcohol solution).
引文
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