The invention discloses a
dolomite-
molybdenum trioxide composite catalyst for preparing
acrolein by
glycerol dehydration and a preparation method thereof, and the method comprises the following steps: crushing,
grinding, washing and
drying natural
dolomite, putting into a
muffle furnace, heating to 500-700 DEG C, and calcining for 4 hours to obtain calcined
dolomite;
ammonium molybdate tetrahydrate is dissolved in deionized water, and an
ammonium molybdate tetrahydrate solution is obtained; adding the calcined dolomite into an
ammonium molybdate tetrahydrate solution, stirring for 4-6 hours, dipping for 24-36 hours,
drying in a
drying oven, heating to 700 DEG C in a
muffle furnace, and calcining for 4 hours, so as to obtain the product. The method is simple in operation method, low in price, clean, efficient and environment-friendly, the required
process equipment is also very simple, the
time cost can be reduced, and the method is very suitable for large-scale production; by adopting the catalyst disclosed by the invention, the selectivity of
acrolein can reach more than 50%, and the catalyst has certain
carbon deposition resistance, so that a better technical achievement is achieved.