Bimetallic Cu-Co Nanoparticles Derived From Hydrotalcite Supported On Carbon Fibers For Higher Alcohols Synthesis From Syngas

With the drying up of the fossil resources and the increasingly serious pollution of the environment,the higher alcohols synthesized from syngas possess broad application prospects and values.The catalysts used for the higher alcohols synthesized failed to bring about industrialization due to its poor activity,selectivity and stability.Our team have prepared the nano-bimetallic CuCo alloy supported on Al2O3 after calcination and reduction of the CuCo-LDHs precursor.The results showed that the catalysts have a good catalytic activity and selectivity,while factors such as the agglomeration resulted from the poor dispersion of the particles restrict the further improvement of the catalytic performances.Combined with precious works made by our group,nanocomposites of LDHs and CFs are prepared.The features of the catalyst and the effect of CFs were investigated.Also,the influences of different additives on the catalyst performance were further studied.Nanocomposites of LDHs and CFs were prepared by using co-precipitation method and used for HAS,and characterized by using FTIR,N2 adsorption-desorption,XRD,TPR,SEM and TEM techniques.After reduction,CuCo-alloy nanoparticles are formed from the LDHs.The tests indicated that the introduction of carbon fiber could improve the catalytic performances.Under the experimental conditions of 220 oC,3 MPa,H2/CO=2,the space velocity of 3900h-1,CuCo/Al2O3/30%CFs exhibits the better catalytic performances with higher activity and higher selectivity to C2+OH.In order to invest the influence of additives on the catalysts,a series of Cu1Co2M0.2Al1.6-LDHs/30%CFs(M = Zn?Fe?Mg?Mn?Ca)were prepared by using co-precipitation method and characterized by using XRD,TPR techniques.Characterization results show that the added additives have no influence on the structure of the composite catalysts,but have certain effects on the reduction.It is worthy noting that the addition of Mg affect the reduction of the oxides.As activity tests showed that the addition of Fe has positive effects on improving the catalytic performance,but Zn additive seems to fail to improve the catalytic performances,while the additives,such as Mg?Mn?Ca,have little positive impact.