Regeneration method of tin platinum catalyst: A regeneration test was conducted on the 10 mL device using a catalyst that had been aged and deactivated. The conditions for charcoal burning, chlorine supplementation, and platinum grain redispersion were investigated in detail. The simple process of charcoal burning regeneration is referred to as simple regeneration in this article, and the regeneration process including charcoal burning, chlorine replenishment, and (oxidation) renewal is called complete regeneration. The process of chlorine replenishment controlling the water content of the system is called wet chlorination, and the process of keeping it dry is called dry chlorination.
The charcoal burning conditions for simple regeneration and complete regeneration are the same, both using segmented charcoal burning method. The first stage is below 40 ℃, gradually increasing from room temperature. Use nitrogen as a carrier gas and control a lower O2 content. Mainly due to the accumulation of carbon on the surface of the catalyst. The second stage is to reach the allowable temperature of the catalyst at around 40 ℃, mainly burning the carbon on the surface area inside the catalyst. Due to the internal diffusion control of the combustion reaction on the inner surface, the O: content in the carrier gas is correspondingly increased by 1-2 times, and sufficient combustion time is maintained to ensure complete charcoal burning. Chlorination is carried out at high temperature, using nitrogen containing a certain amount of 0.2 as the carrier gas, uniformly injecting the measured chlorine supplement CCI4, controlling the temperature and pressure of the system, and controlling the water content at the inlet or outlet according to the test requirements (tested with a moisture meter). The update is carried out under conditions about 20 ℃ higher than chlorination, and air can be directly used as the carrier gas to increase the content of O2.
Regeneration of non acidic supported platinum catalyst: A regeneration method for non acidic supported platinum catalyst used for dehydrogenation of n-alkanes to produce mono dilute hydrocarbons. The basic feature is to treat the deactivated catalyst in stages with oxygen-containing nitrogen gas under different conditions, and then immerse it in a solution containing platinum or cobalt, dry it, air roast it, steam dechlorination it, and reduce it with hydrogen gas to regenerate the deactivated catalyst once. After the catalyst is deactivated again, it can be directly regenerated by charcoal burning and hydrogen reduction.
