Method for preparing alumina catalyst, alumina catalyst prepared using same, and method for preparing propylene using alumina catalyst

[0028] The method of preparing an aluminum oxide catalyst of the present invention includes: Step S1: calcining the alumina precursor to form a mixed phase alumina, the mixed phase alumina comprises from 1 to 15% by weight α-alumina, 60 to 95 The weight% θ-alumina, and 4 to 25% by weight of Δ-alumina; step S2: The mixed phase alumina is steam treated with water vapor at a temperature below the primary calcination temperature to activate mixed phase alumina; And step S3: After step S2, secondary calcination is carried out at a temperature higher than the steam processing temperature but below the primary calcination temperature. In this case, it is possible to improve the stability and activity of the alumina catalyst having a compromise based on temperature, and can prepare an alumina catalyst having high mechanical strength and high corrosion / chemical resistance.

[0029] Hereinafter, a method of preparing an aluminum oxide catalyst of the present invention will be gradually des

[0088] Example 1

[0089]Burmite was calcined at 1100 ° C for 10 hours under the air atmosphere to obtain a mixed phase oxide of θ-alumina and 20% by weight of δ-alumina by 10% by weight of α-alumina, 70% by weight of θ-alumina and 20% by weight of δ-alumina. . The mixed phase alumina was filled in the tubular reactor, and the temperature of the tubular reactor was set to 400 ° C, and then the steam treatment was performed by supplying water vapor and nitrogen to the reactor. At this time, water vapor is supplied with a rate of 0.026 to 0.1 g / min using an HPLC pump, and a mixture ratio of nitrogen gas and water vapor is supplied with a mass flow controller (MFC) at a rate of 133 ml / min (N. 2 : H 2 The volume ratio of O is 2,500: 1, and the weight ratio of water vapor and mixed phase alumina is from 0.01 to 100: 1. Further, after the steam treatment, calcined at 550 ° C for 5 hours to obtain an alumina catalyst.

[0090] Example 2

[0091] This process is carried out in the same manner as in Example 1 except for 6 hours rather than 3 hours during steam treatment.