Study on the alkylation of aromatic hydrocarbons and propylene

Abstract

In order to improve the efficiency of the alkylation reaction to aromatic hydrocarbons and propylene, different types of catalysts were screened, including ultra-stable Y molecular sieves (USY), solid phosphoric acid (SPA), ZSM type molecular sieve (HZSM), etc. The effects of reaction temperature, catalyst loading, and reaction time on the conversion rate of aromatic hydrocarbons and the selectivity of target products were investigated using the high-pressure reaction device. The catalysts were characterized by XRD, BET, SEM, FT-IR, NH 3 -TPD, and other methods. The experimental results show that the USY catalyst exhibits higher catalytic activity for alkylation. This catalyst can be used for the alkylation of different aromatic hydrocarbons. Good conversion and selectivity can be obtained. Futhermore, in a six-cycle experiment, the USY catalyst was reused without loss of efficiency.

Phosphorus-/Tungsten-Doped ZSM-5 Composites with a Hierarchical Structure for Efficient Production of 2,6-Diisopropylnaphthalene

“…For example, AlCl 3 is widely applied in the chemical industry, but its production produces a lot of waste water and nonregenerable AlCl 3 . To simultaneously accomplish both environmentally friendly and high-activity heterogeneous catalysts under mild conditions, 39,40 we prepare PW-ZSM-5-AL with highly dispersed W/P nanoparticles on ZSM-5-AL support featuring hierarchically microporous−mesoporous structures with an excellent catalyst for this alkylation reaction. The fluorene alkylation reaction was first performed on fluorene to optimize the conditions of time, pressure, and temperature (optimized conditions: 4 h, 4 MPa, 433 K).…”