High Catalytic Performance of Mesoporous Dual Brønsted Acidic Ternary Poly (Ionic Liquids) for Friedel‐Crafts Alkylation. (22nd August 2019)

• Record Type: Journal Article
• Authors: Sha, Xiao; Sheng, Xiaoli; Zhou, Yuming; Wang, Beibei; Liu, Yonghui; Bao, Jiehua
• Is Part Of: Applied organometallic chemistry. Volume 33:Number 11(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-08-22
• Subjects: dual‐acid catalysis -- functional -- mesoporous structure -- polymers; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.5180
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract : A newfangled cross‐linked dual Brønsted 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‐SO3 H)‐SO3 CF3 sample appeared a relatively high thermal stability, a large surface area (up to 286.8 m 2 /g) and great pore volume (0.73 cm 3 /g). The abundant dual acidic group of sulfonic acid and trifluoromethanesulfonic acid of the composite in the polymer framework impart Brønsted 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. Abstract : A sponge‐like mesoporous dual Brønsted acidic ternary poly (ionic liquids) was synthesized with a relatively high thermal stability and a large surface area. To firmly anchor the acidic functional group through an anion exchange process. The polymerization composite exhibits a well performance in the alkylation of o‐xylene and styrene.