失活TS-1高效催化环己烯水合生成环己醇的研究  

Deactivated TS-1 as Efficient Catalyst for Hydration of Cyclohexene to Cyclohexanol

作　　者：姚旭婷 黄鑫 林玉霞 刘月明 Yao Xuting;Huang Xin;Lin Yuxia;Liu Yueming(Shanghai Key Laboratory of Green Chemistry and Chemical Processes,School of Chemistry and Molecular Engineering,East China Normal University,Shanghai 200062,China)

机构地区：[1]华东师范大学化学与分子工程学院上海市绿色化学与化工过程绿色化重点实验室,上海200062

出　　处：《化学学报》2020年第10期1111-1119,共9页Acta Chimica Sinica

基　　金：国家重点研发计划(No.2016YFB0701100)资助。

摘　　要：环己醇是一种重要的化工中间原料,目前工业上主要是以ZSM-5分子筛作为催化剂,通过环己烯水合反应一步法制备.钛硅分子筛TS-1是工业环己酮液相氨肟化过程中的高效催化剂,其失活后显示出典型Br?nsted酸性质,基于此,本工作发展了失活TS-1作为催化剂催化环己烯水合反应的方法,详细考察了反应时间、反应温度、催化剂含量及环己烯和水的质量比等参数对反应的影响.研究表明,失活TS-1是高效催化剂,在优化的反应条件下可得到11.0%的环己醇收率和99.8%的环己醇选择性,显示出高活性、高选择性和高稳定性的特点.通过酸洗改性与K+交换实验以及结合UV-Vis(固体紫外漫反射可见光谱)、FT-IR(傅里叶变换红外光谱)、29Si MAS NMR(固体魔角硅核磁)和NH3-TPD(氨气程序升温-脱附)等表征技术,进一步研究发现,失活TS-1中含有两种Br?nsted酸中心,而催化环己烯水合反应的高效活性中心为与钛羟基相邻的硅羟基(Si-OH(Ti)).该Br?nsted酸中心的结构完全不同于ZSM-5分子筛中的骨架桥式Br?nsted酸中心(Si-(OH)-Al),且表现出相对较弱的酸强度特征,因而促进了环己烯水合反应中生成环己醇的主反应路径,抑制了环己烯异构化的副反应路径,表现出高环己醇选择性的特性.失活TS-1废催化剂特殊Br?nsted酸中心的发现与应用为废催化剂固废资源的资源化利用提供了新思路.Cyclohexanol is an important chemical intermediate material. At present, ZSM-5 is mainly used as a catalyst in the industry to produce cyclohexanol by one-step hydration of cyclohexene. Its core is the development of high-performance catalysts. TS-1 is a high efficient catalyst for industrial liquid-phase ammoniation of cyclohexanone, which shows a typical Br?nsted acidity after deactivation. Based on this, we applied the deactivated TS-1 as catalyst for cyclohexene hydration reaction, and investigated systematically the effects of reaction time, reaction temperature, catalyst dosage and mass ratio of water to oil on the hydration reaction of cyclohexene. The results showed that the deactivated TS-1 could offer a high catalytic performance with 11.0% yield and 99.8% selectivity towards cyclohexanol under the optimized reaction conditions, which indicated that the deactivated TS-1 is a high-performance catalyst and possesses the characteristics of high activity, high selectivity and high stability. Combined with nitric acid treating modification, potassium ion exchange experiment and the characterization techniques such as UV-Vis(UV-visible spectroscopy), FT-IR(Fourier transform infrared spectrometer), 29 Si MAS NMR(29 Si magic angle solid nuclear magnetic resonance), and NH3-TPD(temperature-programmed desorption of ammonia), it was found that the deactivated TS-1 possesses two kinds of Br?nsted acid sites, whereas its real active center for the hydration reaction of cyclohexene is silanol group adjacent to titanium hydroxyl group(Si-OH(Ti)). The structure of this Br?nsted acid site is completely different from the skeleton bridge Br?nsted acid site(Si-(OH)-Al) of ZSM-5 zeolite, meanwhile shows relatively weak acid strength. The unique acid property of Si-OH(Ti) could promote the main reaction path of cyclohexanol formation and inhibit the side reaction path of cyclohexene isomerization in cyclohexene hydration reaction, which determined its characteristic of high cyclohexanol selectivity. The discovery and applic

关 键 词：失活TS-1 环己醇 环己烯 水合反应 Brφnsted酸中心 

分 类 号：O624.3[理学—有机化学] O643.36[理学—化学]