制备方法对Ni2P/SiO2催化剂结构及萘加氢性能的影响  

Effect of preparation methods on the structure and naphthalene hydrogenation performance of NiP/SiO catalyst

作　　者：荆洁颖[1] 杨志奋 王九占 刘道诚 冯杰[1] 李文英[1] JING Jie-ying;YANG Zhi-fen;WANG Jiu-zhan;LIU Dao-cheng;FENG Jie;LI Wen-ying(Training Base of State Key Laboratory of Coal Science and Technology,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学煤科学与技术省部共建国家重点实验室培育基地,山西太原030024

出　　处：《燃料化学学报》2020年第7期842-851,共10页Journal of Fuel Chemistry and Technology

基　　金：国家重点研发计划(2016YFB0600305);国家自然科学基金(21978190,U1610221)资助。

摘　　要：采用程序升温还原法和次磷酸盐歧化法制备了Ni2P/SiO2催化剂,结合现代仪器分析表征技术,研究了制备方法对Ni2P/SiO2催化剂结构和萘加氢性能的影响。结果表明,两种方法均可制备出仅含Ni2P活性相的Ni2P/SiO2催化剂,在反应温度340℃、氢气压力4 MPa、空速为20.8 h-1下,程序升温还原法制备的Ni2P/SiO2催化剂表现出更高的萘加氢活性,这主要是因为程序还原法制备的Ni2P/SiO2催化剂中有更多Ni2P物种生成,提供了较多的活性位点(CO吸附量21.6μmol/g);且催化剂表面弱酸位点多,有利于芳烃吸附。当选用程序升温还原法制备Ni2P/SiO2催化剂时,在保证生成纯相Ni2P的前提下,较低的Ni/P比更有利于合成高加氢活性的Ni2P/SiO2催化剂。Ni2 P/SiO2 catalysts were prepared by temperature-programmed reduction method and hypophosphite disproportionation method to investigate their naphthalene hydrogenation performance.The prepared catalysts were characterized by ICP-OES,X-ray diffraction,H2 temperature-programmed reduction,N2 adsorptiondesorption method and transmission electron microscopy,etc.Results showed that Ni2 P/SiO2 catalyst with pure Ni2 P crystal phase could be successfully prepared by the temperature-programmed reduction method and hypophosphite disproportionation method.When the naphthalene hydrogenation reaction was performed at340 ℃,4 MPa,H2/oil volume ratio of 600,and a weight hourly space velocity(WHSV) of 20.8 h-1,Ni2 P/SiO2 catalyst prepared by the temperature-programmed reduction method possessed superior hydrogenation activity.This result was ascribed to the advantages of temperature-programmed reduction method.It not only installed the higher number of Ni2P species(CO adsorption amount 21.6 μmol/g) over SiO2,but also obtained more weak acid sites on the catalyst surface,which promoted the adsorption of aromatic hydrocarbons and subsequently resulted in the higher hydrogenation activity.Furthermore,when the temperature-programmed reduction method was used to prepare Ni2 P/SiO2 catalyst,the lower Ni/P molar ratio was more beneficial to enhance the naphthalene hydrogenation activity of the as-prepared catalyst.

关 键 词：萘加氢 Ni2P/SiO2 程序升温还原法 次磷酸盐歧化法 

分 类 号：TQ032[化学工程]