摘要
分别采用水热法和共沉淀法制备了NiAl层状双金属氢氧化物(NiAl-LDH),经焙烧得到NiAl-LDH载体(NiAl-LDO),采用浸渍法制备了Pt/NiAl-LDO催化剂,利用XRD、N2吸附-脱附和TEM等方法对催化剂的物理化学性质进行表征,并考察了催化剂上十氢萘的产氢性能。实验结果表明,水热法更有利于形成NiAl-LDH的层状结构,有助于活性组分的分散和反应物与催化剂活性位的接触;载体中适量Ni的存在有利于Pt颗粒的稳定;过高的Pt负载量易导致Pt颗粒粒径明显增大;当Ni/Al摩尔比为4∶1,Pt负载量为1%(w)时,催化剂的催化脱氢活性最高,在260℃、常压下反应20 min,每克Pt原子的产氢量达到4.47 mol。
NiAl layered double hydroxides(NiAl-LDH)were prepared by the hydrothermal method and co-precipitation method.The NiAl-LDH carrier(NiAl-LDO)were obtained through the calcination,and Pt/NiAl-LDO catalysts were prepared by using the impregnation method.The physicochemical properties of the catalysts were characterized by XRD,N2 adsorption-desorption,and TEM,and the hydrogen production performance of decalin over the catalysts was investigated.The experimental results indicate that the hydrothermal method is more suitable for forming the layered structure of NiAl-LDH,which are conducive to the dispersion of active components and the contact between reactants and catalysts.An appropriate amount of Ni on the carrier contributes to the stability of Pt particles,but excessive Pt loading results in the obvious enlargement of Pt particles.When the Ni/Al molar ratio is 4∶1,and the Pt loading is 1%(w),the catalyst exhibits the highest catalytic activity.The hydrogen production amount per gram of Pt reaches 4.47 mol under atmospheric pressure at 260℃ for 20 min.
作者
李文达
王凤丽
赵俊哲
陈杰玉
刘清龙
罗明生
LI Wenda;WANG Fengli;ZHAO Junzhe;CHEN Jieyu;LIU Qinglong;LUO Mingsheng(College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《石油化工》
北大核心
2025年第2期151-160,共10页
Petrochemical Technology
基金
国家自然科学基金青年项目(22202013)
北京市教委科技计划一般项目(KM202110017010)
大学生研究训练[URT]计划项目(2024J00265)。
关键词
液相有机氢载体
层状双金属氢氧化物
十氢萘脱氢
Pt基催化剂
liquid-phase organic hydrogen carrier
layered double hydroxide
decalin dehydrogenation
Pt-based catalyst
