Preparation of supported Fe₂O₃‐Cl/β‐zeolite catalyst and its application in the selective oligomerization reaction of isobutene in mixed C4

Abstract

BACKGROUND: Isobutene oligomerization is a very promising reaction, and it has always been a research hotspot in the separation of mixed C4. A supported catalyst is a promising olefin oligomerization catalyst. In the work reported, a supported Fe 2 O 3 -Cl/⊎-zeolite molecular sieve catalyst was synthesized by changing the loading amount of various active components, and its catalytic effect on the selective oligomerization of isobutene was studied. The catalyst was characterized using various techniques. The experiments were carried out in a fixed bed reactor, and the effects of Fe loading, temperature and reaction space airspeed were studied. RESULTS:The catalyst has a good catalytic effect on this reaction with the load at 3%, the temperature at 70 °C, the pressure at 1 MPa and the reaction airspeed at 2 h −1 . CONCLUSIONS: The conversion of isobutene was above 90%, the selectivity of C8 was around 80% and the loss of n-butene was very small.

Effect of ethanol on selective oligomerization of isobutene and the simulation of reactive distillation process

“…The catalysts were prepared using an equal volume impregnation method. The specific preparation method can be found in previous literature 21,33 . Based on the preparation methods and performance evaluation of the catalysts in the literature, we selected two supported β molecular sieve catalysts.…”

“…The specific preparation method can be found in previous literature. 21,33 Based on the preparation methods and performance evaluation of the catalysts in the literature, we selected two supported β molecular sieve catalysts. The first catalyst is a Fe 2 O 3 -N/β molecular sieve catalyst with a ferric nitrate impregnation amount of 6% and a calcination temperature of 550 C. The second catalyst is a Fe 2 O 3 -Cl/β molecular sieve catalyst with a ferric chloride impregnation amount of 3% and a calcination temperature of 550 C.…”

“…The catalysts were selected from two supported β molecular sieve catalysts that were previously studied. 21,33 The isobutene oligomerization reaction was simulated and optimized using the reactive distillation process. Sensitivity analysis was conducted on operating parameters such as reflux ratio, the number of theoretical plates in the column, and feeding position to obtain the optimal operating parameters.…”

“…The objective of this paper is to investigate the selective oligomerization of isobutene in mixed C 4 in the presence of ethanol. The catalysts were selected from two supported β molecular sieve catalysts that were previously studied 21,33 . The isobutene oligomerization reaction was simulated and optimized using the reactive distillation process.…”