Abstract:
The present invention relates to a catalyst for direct-synthesizing dimethyl ether from synthesis gas comprising 2-10 wt% of ferrierite pretreated with alumina based on 100 wt% of ferrierite and CuO-ZnO-Al_2O_3 oxides and a preparation method thereof. If performing reaction using the catalyst of the present invention, dimethyl ether can be produced by using synthesis gas having various range of H_2/CO ratio and especially production of by-products is inhibited thereby improving yield of dimethyl ether and stability of the catalyst so as to effectively synthesize dimethyl ether from synthesis gas.
Abstract:
The present invention relates to a catalyst having a core-shell structure for a mixed reforming reaction and to a method for producing the same. The method of the present invention comprises the steps of: preparing an alumina support in which organic acid is treated by adding, dipping, and drying the alumina support in a solvent in which organic acid is dissolved; and producing a nickel-alumina catalyst of a core-shell structure by adding, dipping, and drying the alumina support in a solvent in which a nickel precursor is dissolved. The nickel-alumina catalyst having a core-shell structure for a mixed reforming reaction includes organic acid in alumina support pores by treating the alumina support using organic acid of pKa 3.5 or less, so that a core-shell structure is easily formed and nickel which is an active ingredient can be evenly distributed on the surface of the support. Moreover, the catalyst has the core-shell structure having the surface on which nickel is evenly distributed, so that the catalyst has high stability and excellent reaction activities not only under general conditions but also in high spatial speed conditions. The sintering of nickel occurring in a partially heated catalyst is controlled so that the inactivation of the catalyst is inhibited.