Preparation and Properties of Bi-functional Catalysts(Cu-Co/X-MMT)
A series of bi-functional catalysts(Cu-Co/X-MMT)were prepared via the impregnation method with oxide-pillared montmorillonite(X-MMT,X=SiO2,Al2O3,ZrO2,TiO2)obtained from Na-mont-morillonite(Na-MMT)as the solid acid,Cu as active component and Co as promoter.The acquired cata-lysts were characterized by XRD,N2 adsorption-desorption at low temperature,NH3-TPD,H2-TPR,and XPS.The effect of different kinds of X-MMT on the steam reforming of dimethyl ether(SRD)reaction per-formance of the acquired bi-functional catalysts was investigated.The results show that the structure and acidity of X-MMT are significantly changed compared with Na-MMT,which is dependent on the type of ox-ide X,meanwhile,different X-MMT affects the particle size and reduction degree of copper,and thus influ-encing the SRD reaction performance of bi-functional catalysts.Among others,the Cu-Co/SiO2-MMT bi-functional catalyst exhibits the best SRD performance,with the dimethyl ether conversion and H2 yield reaching 80.3％and 57.3％under the conditions of 0.1 MPa,350℃ and gas hour space velocity(GHSV)of 3000 mU(g·h),respectively.
compositepillared montmorillonitedimethyl ethersteam reforminghydrogen production
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维普
