Study On Production Technology Of Isobutane Dehydrogenation Fluid Catalyst

Research in the process of preparing catalyst active component impregnation sequence, roasting times of catalyst and the influence of drying conditions on the catalyst of synthesis and performance; Also studied the rule of SiO₂ modification catalyst Cr2O₃ / Al2O₃ / K2 O performance of dehydrogenation reaction, structure-activity relationship of it.The study found that the gamma alumina（75-150μ m）at 1000 ℃ after roasting 2 h have suitable intensity and specific surface area for fluidized bed catalyst carrier. The preparation of industrial-grade isobutane fluidized bed catalyst precursors for active components of CrO₃/K2CO₃, a better method of preparation of catalyst for: total immersion method of dipping active component,dry the water bath temperature gradually increase, water bath after natural air drying process, step by step into the oven drying. In front of the catalyst in reaction to the catalyst under the condition of H2 reduction can improve the catalytic activity. H2 reduction conditions : temperature: 580 ℃, flow:50 ml/min, time: 60 min. Catalyst activity evaluation of SiO₂ modification and found that the addition of SiO₂ decreased the activity of dehydrogenation reaction, load SiO₂ catalyst, SiO₂ load of 1.5 wt % and 2 wt % of catalyst have slower deactivation rate. Dehydrogenation of SiO₂ load of 0.5 wt % of catalyst have the the worst activity.Combination of dehydrogenation catalyst assessment results and SEM characterization, found the cause of lower reactivity is SiO₂ covered the part of the reactive center. SiO₂ is a state of low clustering and load on the surface of catalyst, it can play the role of a stable catalyst structure enhance the strength of the catalyst, the α- Cr2O₃ crystals could increase the strength of the catalyst ether.In this paper we answer the basic questions of process in industrial production, and Systematic study the strength and dehydrogenation performance relationship of the modified SiO₂ catalysts. O_ur fluidized bed catalyst has the high strength but poor activity. Under the condition of the appropriate particle, larger specific surface area, smaller entrance and aperture alumina carrier is our future work direction.