Patent ID: 8012906

Claim:
A high-temperature catalytic material, comprising: multiphase alumina powder obtained by subjecting a mixture of gibbsite and boehmite in a weight ratio of 1:99 to 10:90 to a single dry thermal treatment, at 500-1100 degrees Celsius in air for 1 to 3 hours, without alkaline or hydrothermal treatment, and the multiphase alumina powder comprises: an α-phase alumina powder ranging from 1% to 10% by weight, wherein a particle size of the α-phase alumina powder is in a range from 50 nm to 200 nm; θ-phase alumina powder and δ-phase alumina powder and optionally γ-phase alumina powder, wherein the multiphase alumina powder has an amount of the θ-phase alumina powder and the δ-phase alumina powder and optionally γ-phase alumina powder ranging from 70% to 98% by weight in the multiphase alumina powder, and the multiphase alumina powder has an amount of the δ-phase alumina powder ranging from 20% to 40% by weight in the multiphase alumina powder; and κ-alumina powder and optionally x-phase alumina powder, wherein the multiphase alumina powder has an amount of the κ-phase alumina powder and optionally the x-phase alumina powder ranging from 1% to 20% by weight in the multiphase alumina powder, and wherein the α-phase alumina powder serves to suppress crystal growth of the θ-phase alumina powder, the κ-phase alumina powder serves to suppress phase transformation from the θ-phase alumina powder to the α-phase alumina powder, and the catalytic material is capable of a long-term usage under a high temperature of 700 degrees Celsius to 1000 degrees Celsius and being maintained at a specific surface area ranging from 60 m 2 /g to 100 m 2 /g.