The invention discloses a composite
solid super acidic catalyst, a preparation method thereof and a method for catalytically synthesizing N,N-
diethylaniline by using the
solid super acidic catalyst. The composite
solid super acidic catalyst is composed of a composite carrier CeO2-WO3-ZrO2 and SO4<2-> supported on the surface; the preparation comprises the following steps: preparing a precursor ofthe carrier, placing the precursor into a (NH4)2SO4 solution for immersion, performing
drying, and performing
calcination to obtain the super acidic catalyst; and the method for catalytically synthesizing the N,N-
diethylaniline by adopting the catalyst comprises the following steps: putting the solid super acidic catalyst into a
fixed bed tubular reactor, adding a
mixed solution of
aniline and
ethanol, and performing a reaction to obtain the N,N-
diethylaniline. The solid super acidic catalyst provided by the invention has strong acidity and a high acid center density, and the presence of
oxygen vacancies can enhance activity of the catalyst; at the same time, the preparation method is simple and convenient, and has strong
operability; and according to the N,N-diethylaniline catalytically synthesized by adopting the catalyst, the conversion rate of
aniline is higher, and the selectivity of the N,N-diethylaniline is higher.