Ionic liquid-assisted preparation of hydroxyapatite and its catalytic performance for decarboxylation of itaconic acid  

作　　者：Shutong Pang Hualiang An Xinqiang Zhao Yanji Wang 

机构地区：[1]Hebei Provincial Key Laboratory of Green Chemical Technology and Efficient Energy Saving,Tianjin Key Laboratory of Chemical Process Safety,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第3期9-15,共7页中国化学工程学报（英文版）

基　　金：supported by National Natural Science Foundation of China(21978066);Basic Research Program of Hebei Province for Natural Science Foundation and Key Basic Research Project(18964308D);the Key Program of Natural Science Foundation of Hebei Province(B2020202048).

摘　　要：The synthesis of methacrylic acid from biomass-derived itaconic acid is a green route,for it can get rid of the dependence on fossil resource.In order to solve the problems on this route such as use of a preciousmetal catalyst and a corrosive homogeneous alkali,we prepared a series of hydroxyapatite catalysts by an ionic liquid-assisted hydrothermal method and evaluated their catalytic performance.The results showed that the ionic liquid[Bmim]BF_(4) can affect the crystal growth of hydroxyapatite,provide fluoride ion for fluorination of hydroxyapatite,and adjust the surface acidity and basicity,morphology,textural properties,crystallinity,and composition of hydroxyapatite.The[Bmim]BF4 dosage and hydrothermal temperature can affect the fluoride ion concentration in the hydrothermal system,thus changing the degree of fluoridation of hydroxyapatite.High fluoride-ion concentration can lead to the formation of CaF_(2) and thus significantly decrease the catalytic performance of hydroxyapatite.The hydrothermal time mainly affects the growth of hydroxyapatite crystals on the c axis,leading to different catalytic performance.The suitable conditions for the preparation of this fluoridized hydroxyapatite are as follows:a mass ratio of[Bmim]BF4 to calcium salt=0.2:1,a hydrothermal time of 12 h,and a hydrothermal temperature of 130℃.A maximal methacrylic acid yield of 54.7%was obtained using the fluoridized hydroxyapatite under relatively mild reaction conditions(250℃ and 2 MPa of N_(2))in the absence of a precious-metal catalyst and a corrosive homogeneous alkali.

关 键 词：Ionic liquid HYDROXYAPATITE Itaconic acid Methacrylic Decarboxylation reaction 

分 类 号：TQ225.24[化学工程—有机化工] O643.36[理学—物理化学]