Chemoselective nitrilation of dimethyl adipate with ammonia over carbon encapsulated WOx catalysts under continuous flow conditions. Issue 12 (12th May 2022)

• Record Type: Journal Article
• Authors: Ding, Guang-Rong; Wang, Yao-Feng; Duan, Guo-Yi; Guo, Tao; Xu, Xiao-Feng; Li, Chun-Shan; Xu, Bao-Hua
• Is Part Of: Catalysis science & technology. Volume 12:Issue 12(2022)
• Page Start: 3982
• Page End: 3991
• Publication Date: 2022-05-12
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d2cy00733a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Adiponitrile (ADN) is a key intermediate for the industrial production of polyamide represented by nylon 66. Abstract : Adiponitrile (ADN) is a key intermediate for the industrial production of polyamides represented by nylon 66. In this study, the chemoselective nitrilation of dimethyl adipate (DMA) with ammonia (NH3 ) under continuous flow conditions was studied on carbon encapsulated oxygen-deficient WO x <3 catalysts (WO x @C/C). A combination of dispersed anchor sites at a poly(ionic liquid) (PIL) template, the porosity of active carbon support, and the calcination procedure allows the formation of effective WO x @C-600-0.25-A1, persisting high BET specific surface area and WO2.83 active phase of appropriate size. It delivers ADN and methyl 5-cyanopentanoate (MCP) with an excellent selectivity of up to 95.8% at a weight hourly space velocity of DMA (WHSVDMA ) of ∼0.64 gDMA gcat −1 h −1 and an NH3 /DMA molar ratio of 13 : 1. A tandem reaction route from DMA to ADN via MCP was elucidated, wherein the second nitrilation of MCP to ADN proceeds very slowly. Besides, both C DMA and TONADN /TONMCP are significantly influenced by the physical dispersion and size of the active WO2.83 phase in WO x @C/C.