硫掺杂二氧化钛上负载镍纳米颗粒光催化苯乙炔选择性加氢  

Photocatalytic selective hydrogenation of phenylacetylene over sulfur-doped TiO_(2) supported Ni nanoparticles catalyst

作　　者：李新成 王瑞义[1] 冯淑婷 王云伟[1] 郑占丰 LI Xincheng;WANG Ruiyi;FENG Shuting;WANG Yunwei;ZHENG Zhanfeng(State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院山西煤炭化学研究所煤炭高效低碳利用全国重点实验室,山西太原030001 [2]中国科学院大学,北京100049

出　　处：《燃料化学学报（中英文）》2024年第11期1715-1727,共13页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(22072176);山西省基础研究计划(20210302123012)资助。

摘　　要：通过焙烧硫酸氧钛水合物前驱体制备了一系列硫掺杂TiO_(2)负载Ni纳米颗粒催化剂。考察了不同焙烧温度对TiO_(2)表面硫物种含量及光催化苯乙炔选择性加氢反应性能的影响。采用XRD、UV-vis DRS、TEM等技术对催化剂的结构和形貌进行了表征。XPS和原位DRIFTS结果表明,TiO_(2)表面的硫物种向Ni发生电子转移,富电子态的Ni可以促进苯乙烯的脱附;原位DRIFTS结果表明,光照可以促进催化剂表面H_2的解离和活化,提高苯乙炔的转化频率。本工作有助于促进对高效高选择性加氢光催化剂的设计和理解。The selective hydrogenation of alkynes to alkenes,as one of the basic hydrogenation processes,is of great importance in the fine chemical,pharmaceutical,coal chemical and environmental protection industries.For example,polystyrene is one of the world's five most used general-purpose plastics,and is widely used in the manufacture of rigid plastics for household appliances,films and foam products.However,styrene products often contain a certain amount of phenylacetylene,which can lead to catalyst poisoning in the polymerisation of styrene.Due to the similar properties of styrene and phenylacetylene,it is very difficult to separate trace amounts of phenylacetylene from styrene.The best method to solve this problem is to convert phenylacetylene to styrene by selective hydrogenation.In recent years,metal photocatalysis has demonstrated great potential in the field of organic synthesis due to its mild reaction conditions.When metal nanoparticles are exposed to light irradiation with a wavelength greater than their size,collective oscillations of electrons on the surface of the metal particles are induced.Localised surface plasmon resonance(LSPR)occurs when the collective oscillations of the surface electrons match the electric field of the incident light.It is a new type of photocatalytic technology different from the traditional semiconductor photocatalytic charge separation mechanism.Light-excited high-energy electrons are distributed on the metal surface,which makes the highest intensity of photoelectric field on the metal surface and favours the reaction to proceed on the surface.The metal nanoparticles absorb the light energy and make it enriched on the metal surface,which is finally converted into the excited high-energy electron energy.The energetic electrons directly activate the reactant molecules adsorbed on the surface of the metal nanoparticles to initiate the reaction.Therefore,it is of great interest to achieve selective hydrogenation of phenylacetylene under mild reaction conditions by metal photocatalys

关 键 词：硫掺杂二氧化钛 Ni纳米颗粒 苯乙炔 选择性加氢 光催化 

分 类 号：O643[理学—物理化学]