| 摘要 |
The present invention relates to an improved process for making an iron oxide-containing dehydrogenation catalyst which comprises mixing a promoter, such as an alkaline carbonate, and porosity control agents comprising organic materials such as, for example, graphite and methyl cellulose, forming the mixture into a particulate mass and then calcining the particulate mass at temperatures sufficient to oxidize the organic materials and convert the carbonate to an oxide. The improvement comprises conducting the calcining process in two steps, wherein said particulate mass is heated in a first step to a temperature sufficient to oxidize said organic materials and thereafter heated in a second step to a temperature sufficient to convert substantially all carbonates present to the corresponding oxides. Compared to the catalysts produced by the prior art one-step calcining process, the catalysts of the subject invention have better moisture stability. The present catalysts have high activity and can operate at low steam to oil ratios. |
