Silica supported potassium oxide catalyst for dehydration of 2-picolinamide to form 2-cyanopyridine

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英文篇名：Silica supported potassium oxide catalyst for dehydration of 2-picolinamide to form 2-cyanopyridine 作者：Yamei ; Li ; Yujun ; Zhao ; Shengping ; Wang ; Xinbin ; Ma 英文作者：Yamei Li;Yujun Zhao;Shengping Wang;Xinbin Ma;Key Laboratory for Green Chemical Technology,School of Chemical Engineering and Technology,Tianjin University,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); 英文关键词：2-Picolinamide;;2-Cyanopyridine;;Dehydration;;Potassium oxide 中文刊名：FXKB 英文刊名：中国化学快报(英文版) 机构：Key Laboratory for Green Chemical Technology,School of Chemical Engineering and Technology,Tianjin University,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); 出版日期：2019-02-15 出版单位：Chinese Chemical Letters 年：2019 期：v.30 基金：Financial support from the National Natural Science Foundation of China (NSFC Nos. 21176179, U1510203, 21325626) 语种：英文; 页：FXKB201902053 页数：5 CN：02 ISSN：11-2710/O6 分类号：244-248

摘要

The dehydration of 2-picolinamide to produce 2-cyanopyridine was investigated thoroughly using silica supported potassium oxide as a heterogeneous catalyst. Both large specific surface area and pore size of SiO_2 (B) contributed to the favorable catalytic performance for the synthesis of 2-CP. In addition, the yield of 2-CP showed the linear relationship with the amounts of medium basicity of the catalysts,demonstrating that medium basic sites were the active sites of silica supported potassium oxide catalysts. The catalysts were further characterized by XRD and FT-IR to clarify the active species. The results indicated the Si—O—K group produced by the reaction of K_2CO_3 with Si—OH was the active species, which was further evidenced by the adjustment of the amount of Si—OH by silylation and hydroxylation procedure.
        The dehydration of 2-picolinamide to produce 2-cyanopyridine was investigated thoroughly using silica supported potassium oxide as a heterogeneous catalyst. Both large specific surface area and pore size of SiO_2 (B) contributed to the favorable catalytic performance for the synthesis of 2-CP. In addition, the yield of 2-CP showed the linear relationship with the amounts of medium basicity of the catalysts,demonstrating that medium basic sites were the active sites of silica supported potassium oxide catalysts. The catalysts were further characterized by XRD and FT-IR to clarify the active species. The results indicated the Si—O—K group produced by the reaction of K_2CO_3 with Si—OH was the active species, which was further evidenced by the adjustment of the amount of Si—OH by silylation and hydroxylation procedure.

引文

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