SINGLE CRYSTALLINE CATALYST OF GAMMA-BISMUTH MOLYBDATE AND PROCESS FOR PREPARING 1,3-BUTADIENE USING THE CATALYST

摘要

PURPOSE: The single crystalline catalyst of gamma-bismuth molybdate and a method for preparing 1,3-butadiene using the catalyst are provided to improve the reproducibility of preparing processes by increasing the uniformity of the catalyst. CONSTITUTION: The average pore volume, the average pore diameter, and the specific surface area of the single crystalline catalyst of gamma-bismuth molybdate is respectively between 0.05 and 0.1 cm^3/g, between 200 and 500 angstrom, and between 5 and 30m^2/g. The atomic ratio of bismuth to molybdenum is between 1.5 and 2.2. A method for preparing the single crystalline catalyst includes the following: a molybdenum precursor aqueous solution, a bismuth precursor aqueous solution, and a citric acid aqueous solution are prepared; the molybdenum precursor aqueous solution is mixed with the citric acid aqueous solution; the mixed solution is stirred, and the bismuth precursor aqueous solution is added into the mixed solution; the pH value of the mixed solution is adjusted to be in a range between 0.1 and 3, and a solution in form of sol is prepared; and the solution in form of sol is aged to obtain a mixture in form of gel; The mixture in form of gel is dried and fired.