Zeolite Supported Ionic Liquid Catalysts for the Hydrochlorination of Acetylene

Bolin Wang,Huixia Lai,Lingling Guo,Haihua He,Jia Zhao,Yuxue Yue,Yaqin Deng,Xiaonian Li,Gangfeng Sheng

doi:10.3390/catal8090351

Bolin Wang, Huixia Lai + Show 7 more

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https://doi.org/10.3390/catal8090351

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Journal: Catalysts	Publication Date: Aug 27, 2018
Citations: 22	License type: CC BY 4.0

Affiliation: Zhejiang University of Technology

Abstract

An efficient and stable heterogeneous Zeolite Supported Ionic Liquid Catalyst (IL/CaX) has been explored in acetylene hydrochlorination reaction. The IL/CaX catalyst exhibits excellent space time yields of vinyl chloride (VCM), when compared to the benchmark of Au/C systems. Through characterization and kinetic studies, the reaction follows a two-site mechanism, which is described as the adsorbed hydrogen chloride on the Ca2+ in zeolite, reacting with the adsorbed acetylene on the cation of ionic liquid to form vinyl chloride. The catalytic reaction takes place at the IL/CaX interface, whilst the upper interphase IL/CaX is not active. The deactivation of the catalyst is caused by the dissolving byproducts in the ionic liquid layer, which can be reactivated by a simple vacuum procedure. It is of great significance to study and develop green non-mercury catalysts, in acetylene hydrochlorination.

Highlights

Polyvinyl chloride (PVC) is the third most widely used plastic throughout the world [1].During the past decade, acetylene hydrochlorination dominated approximately 80% of total PVC production in China, about 40% global PVC production, due to plentiful and cost-effective coal supplies, but a shortage of oil and gas [2]
The result indicated that there was no destruction of the CaX zeolite apparent structure, after the ionic liquid immobilization
This paper reported a novel efficient zeolite supported ionic liquid catalysts, for the hydrochlorination of acetylene

Summary

Introduction

Polyvinyl chloride (PVC) is the third most widely used plastic throughout the world [1].During the past decade, acetylene hydrochlorination dominated approximately 80% of total PVC production in China, about 40% global PVC production, due to plentiful and cost-effective coal supplies, but a shortage of oil and gas [2]. Reacts with hydrogen chloride (HCl) and is catalyzed by the activated carbon-supported HgCl2 catalyst with typically 10–15 wt % loading [2], which is volatile and toxic to the environment and human health. In this reaction, the replacement of HgCl2 catalyst for this reaction to an environment-friendly catalyst is necessary with times. Au/AC [3,4,5], Pd/AC [6,7], Ru/AC [8,9], and Cu/AC [10,11] catalysts to replace Hg/AC catalysts in acetylene hydrochlorination, which result in much better activity and stability. Except for the above non-mercury catalysts, the metal-free catalysts, nitrogen-doped carbon materials, including activated carbon-supported g-C3 N4 [12], SiC-nanocomposite carbon materials doped with nitrogen [12], N-doped carbon materials [13], and zeolitic imidazolate framework (ZIF-8) [14]

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