Copper bismuth catalyst for synthesis of 1, 4-butynediol and preparation method thereof

The invention discloses a preparation method of a copper bismuth catalyst for synthesis of 1, 4-butynediol. The method includes the steps of: (1) preparing an acidic solution containing a copper salt and a bismuth salt; (2) preparing a precipitant solution; (3) adding base water into a reaction kettle; (4) adding the acidic solution of step (1) and the precipitant solution of step (2) into the reaction kettle dropwise by a cocurrent flow mode; (5) when the residual acidic solution accounts for 1/3-1/2 of the total amount of the acidic solution prepared in step (1), adding a silicon source, and further carrying out co-precipitation reaction; (6) when 80% the sediment grains are greater than 5micrometers, adding polyvinylpyrrolidone and N, N'-bismethyl acrylate ethylenediamine; (7) at the end of the reaction, performing aging; (8) then conducting washing and filtering; and (9) adding deionized water containing potassium nitrate into a filter cake, stirring the substances evenly, then adding a binder and sodium hexametaphosphate, performing beating, and then carrying out spray drying to obtain the copper bismuth catalyst. The catalyst prepared by the method has the advantages of good wear resistance, uniform and moderate particle size and high activity stability, etc.