81749-28-2Relevant articles and documents
High Catalytic Performance of Mesoporous Dual Br?nsted Acidic Ternary Poly (Ionic Liquids) for Friedel-Crafts Alkylation
Sha, Xiao,Sheng, Xiaoli,Zhou, Yuming,Wang, Beibei,Liu, Yonghui,Bao, Jiehua
, (2019)
A newfangled cross-linked dual Br?nsted acidic ternary mesoporous poly (ionic liquids)(MPILs) with mesoporous structure was successfully synthesized with divinylbenzene as cross linker, 1-vinyl-3-butyl imidazole bromide and sodium p-styrene sulfonate as functional group through an ordinary post-modification method and anion exchange process. A sponge-like mesoporous tunnel structure was observed and the obtained P (BVS-SO3H)-SO3CF3 sample appeared a relatively high thermal stability, a large surface area (up to 286.8?m2/g) and great pore volume (0.73?cm3/g). The abundant dual acidic group of sulfonic acid and trifluoromethanesulfonic acid of the composite in the polymer framework impart Br?nsted acidity. For the sake of demonstrating our claims, the sample has been used as a novel solid acid catalyst for the reaction of alkylation of o-xylene with styrene to 1-diphenylethane (PXE). Under optimal reaction conditions (reaction under 120?°C for 3?hr, catalyst amount was 0.5?wt% of the reaction system, and the mass ratio of o-xylene/styrene was 7.5:1, a 100% conversion of styrene and 93.7% PXE yield was acquired. After four times recycle, the yield remains 53.3%. Comparing with the commercial liquid acid catalyst, it processing a higher catalytic property and recyclability. Moreover, this fresh dual acidic heterogeneous catalyst owning a promising future applied in other acidic catalytic reactions and provide a new method to modify catalyst.
Highly active and green aminopropyl-immobilized phosphotungstic acid on mesoporous LaSBA-15 for alkylation of o-xylene with styrene
Sheng, Xiaoli,Zhou, Yuming,Zhang, Yiwei,Duan, Yongzheng,Xue, Mengwei
experimental part, p. 360 - 367 (2012/06/16)
The Keggin phosphotungstic acid, H3PW12O40 (HPW), was successfully immobilized on the surface of mesostructured LaSBA-15 by means of chemical bonding to aminosilane groups. The catalysts were characterized by elemental analysis, N2 adsoption, TEM, DRS-UV, and FTIR spectroscopy. Characterization results suggest that the surface area decreased after grafting amino groups to silica and the structures of heteropolyanions on amine-modified LaSBA-15 was maintained. Their catalytic behaviors were investigated in the alkylation of o-xylene with styrene. Among the functionalized catalysts, when the content of amino-groups was suitable, it had the best catalytic performances in terms of yield and stability. It is worth mentioning that the catalysts could be used repeatedly without loss of the activity and selectivity during several catalytic cycles. The good stability can be attributed to the strong interaction between the amino groups on the surface of LaSBA-15 and HPW anions.
A novel InCl3/SiO2-catalyzed hydroarylation of arenes with styrenes under solvent-free conditions
Sun, Gaojun,Sun, Huayin,Wang, Zhiyong,Zhou, Ming-Ming
experimental part, p. 1096 - 1100 (2009/04/04)
A novel InCl3/SiO2-catalyzed hydroarylation of various styrenes with arenes has been developed. The reaction can be carried out under solvent-free conditions to afford a series of 1,1-diarylalkanes in high yields and with good regioselectivities. The catalyst can be reused six times without obvious loss of catalytic activity. Georg Thieme Verlag Stuttgart.
