Preparation and catalytic property of composite ionic liquid immobilized on SBA-15.

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From: Canadian Journal of Chemistry(Vol. 99, Issue 10)
Publisher: NRC Research Press
Document Type: Report
Length: 3,180 words
Lexile Measure: 1560L

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Abstract :

In this work, we report a more simple and efficient way to synthesize a composite ionic liquid (IL) ([BMIM][[Zn.sub.2][Br.sub.5]]) by directly coupling the IL with molecular sieves. Two kinds of immobilized catalysts were successfully synthesized: SBA-15-[BMIM] [[Zn.sub.2][Br.sub.5]] and SBA-15-CPTES-[BMIM][[Zn.sub.2][Br.sub.5]]. The catalysts were used to catalyze the cycloaddition reaction of continuous transformation of C[O.sub.2] and propylene oxide, and the catalytic performance of catalysts was further studied. Compared with the traditional IL catalysts, the catalysts not only have excellent catalytic performance, but also have a significantly longer service life. This is because the catalysts are formed by a high energy chemical bond of silane between IL catalysts and molecular sieves, which can effectively solve the problem of the loss of IL active components in the catalytic process. Key words: composite ionic liquid, SBA-15, silane coupling agent, immobilized catalyst, C[O.sub.2]. Dans le cadre des presents travaux, nous decrivons une facon plus simple et efficace de synthetiser le liquide ionique (LI) composite ([BMIM][[Zn.sub.2][Br.sub.5]]) par couplage direct du LI avec des tamis moleculaires. Nous sommes parvenus a synthetiser deux types de catalyseurs immobilises, soit le SBA15[BMIM][[Zn.sub.2][Br.sub.5]] et le SBA15CPTES-[BMIM][[Zn.sub.2][Br.sub.5]]. Nous avons utilise ces catalyseurs pour catalyser la reaction de cycloaddition dans la transformation continue du C[O.sub.2] et de l'oxyde de propylene, et nous avons etudie plus en detail leur performance catalytique. Ces catalyseurs offrent non seulement une excellente performance catalytique, mais celle-ci surpasse celle des catalyseurs traditionnels a base de LI, et leur duree de vie utile est considerablement plus longue. Ces caracteristiques s'expliquent par le fait que ces catalyseurs sont formes de liaisons silane hautement energetiques entre le catalyseur a base de LI et le tamis moleculaire, ce qui permet de resoudre efficacement le probleme de la perte de composants actifs du LI au cours du processus catalytique. [Traduit par la Redaction] Mots-cles : liquide ionique composite, SBA-15, agent de couplage a base de silane, catalyseur immobilise, C[O.sub.2].

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Gale Document Number: GALE|A678582827