Abstract
A qualitative analysis for the ammoximation of acetaldehyde to its oxime using TS-1 as a catalyst and H2O2 as an oxidant was investigated. According to the hydroxylamine mechanism, the effects of temperature, H2O2/acetaldehyde, NH3/acetaldehyde, and the amount of TS-1 on the catalytic properties of TS-1 were studied in detail. The results showed that temperature determined the main and side reactions, and ammonia provided an alkaline environment. Under the optimized reaction conditions, acetaldehyde conversion and acetaldehyde oxime selectivity could reach up to 89.5 and 82.7%, respectively. The comprehensive results of FTIR, XRD, BET and XRF declared that TS-1 deactivation was caused by carbon deposition, not structural damage. The catalyst could be regenerated by calcination when the temperature exceeded a certain minimum value. Meanwhile, the reaction mechanism shows that the procedure of generating hydroxylamine was the control step of reaction, and the entire reaction goes on the route of hydroxylamine.
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