Selective and efficient dimerization of isobutene over H 3 PO 4 /activated carbon catalysts

J of Chemical Tech & Biotech

et al. 2022

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.

Section: Introductionmentioning

confidence: 99%

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

Da-Hai

J of Chemical Tech & Biotech

et al. 2022

“…The INAlk process of UOP company, the isobutylene dimerization‐trickle bed hydrogenation process jointly developed by KBR company and Nestoy company, and the isobutylene dimerization‐hydrogenation process of Lyondell & Kveaemer company 9‐11 are processes that mainly use solid acid catalyst, take mixed C 4 olefins or isobutylene as raw materials, and react to produce dimerized product isooctene, and then hydrogenate isooctene to produce isooctane. An H 3 PO 4 /activated carbon catalyst was prepared by Malaika et al ., 12 and aisobutylene/isobutane mixture with the molar ratio of 4:1 was used as raw material. The experimental results showed that the catalyst could improve the conversion of isobutylene and the selectivity of C 8 products.…”

Section: Introductionmentioning

confidence: 99%

Selective oligomerization of isobutylene in mixed C₄ catalyzed by supported Fe(NO₃)₃/β catalyst

Da-Hai

J of Chemical Tech & Biotech

et al. 2021

BACKGROUND Methyl tert‐butyl ether (referred to as MTBE) is harmful to the environment and hence its use is limited in China. To avoid the waste of isobutylene as MTBE raw material and improve the utilization rate of isobutylene in mixed C4 fraction, supported Fe(NO3)3/β molecular sieve catalysts with different active components were prepared by the equal volume impregnation method. The catalysts were analyzed by X‐ray diffraction (XRD), Thermogravimetric analysis (TG), Temperature programmed desorption of NH3, Brunauer–Emmett–Teller analysis and scanning electron microscopy, and the catalytic performance of catalysts with mixed C4 fractions as raw materials and different active component loadings for selective oligomerization of isobutylene was investigated in a fixed bed reactor. RESULTS The results show that the catalyst has the best catalytic performance when the active component loading was 6%, the reaction temperature was 60 °C, the reaction pressure was 1 MPa and the reaction space velocity was 1.5 h−1. CONCLUSION The conversion rate of isobutylene was >90%, the selectivity of C8 olefin was ≈80% and there was almost no loss of n‐butene. © 2021 Society of Chemical Industry (SCI).

“…This temperature is favorable for increasing yield and reducing ash content. Thus, the Ta is usually in the range of 400 to 500 °C (Demiral and Şamdan 2016;Villota et al 2017;Villota et al 2019), and the activated carbon prepared at these temperatures can have welldeveloped porous structure and large adsorption capacity, which is beneficial for decolorization, water purification, catalytic carriers, and other industrial needs (Malaika et al 2018;Wu et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Effect of activation temperature on properties of H3PO4-activated carbon

Sun

et al. 2021

BioRes

The effects of different activation temperatures (Ta), ranging from 300 to 750 °C, on the ash content, yield, ignition point, microcrystalline structure, surface functional group, pore structure, and adsorption performance of activated carbon in preparing activated carbon by phosphoric acid (H3PO4) were systematically studied. The yield and volatile content of activated carbon decreased with the increase of Ta, while the ash content, ignition point, and graphitization degree showed the opposite results. The turning point of ash content increasing rate of activated carbon occurred at 500 °C. The thermal decomposition temperature of phosphonate compounds was approximately 450 °C. With increased Ta, micropores were generated first, followed by mesopores. The ignition point of activated carbon was related to the volatile content and the degree of graphitization. Activated carbon with low ash content, high yield, well-developed pore structure and good adsorption performance was prepared at 350 to 425 °C. With increased Ta, the volatile content decreased, and the ignition point of activated carbon increased. At Ta higher than 500 °C, the aromatic and condensed ring structure, graphitization degree, and mesopore ratio of the activated carbon increased, yielding decreased adsorption performance.