构建用于光热催化CO_(2)还原的MIL-68(In)衍生的Pd_(x)In_(2-x)O_(3)双金属氧化物催化剂  

Fabrication of Bimetallic Pd_(x)In_(2-x)O_(3) Derived fromMIL-68(In)for Enhancing photothermal CO_(2) Hydrogenation

作　　者：胡军成[1] 董天傲 肖玉 任雨婷 HU Juncheng;DONG Tianao;XIAO Yu;REN Yuting(College of Chemistry and Materials Science&Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]中南民族大学化学与材料科学学院&催化转化与能源材料化学教育部重点实验室,湖北武汉430074

出　　处：《徐州工程学院学报（自然科学版）》2023年第2期84-92,共9页Journal of Xuzhou Institute of Technology(Natural Sciences Edition)

基　　金：国家自然科学基金(22272207);中南民族大学中央高校基本科研业务费专项(CZZ23008)。

摘　　要：将CO_(2)途径逆水煤气反应(RWGS)光热催化转化为CO是应对能源和环境挑战的一种有前途的方法.为了寻求更高效的CO_(2)转化的催化剂,利用水热法合成的1,4-苯二羧基(2-)-ΚO1]羟基铟(MIL-68 (In))作为牺牲模板再煅烧的方式合成了Pd_(2-x)In_(x)O_(3)双金属氧化物.通过扫描电子显微镜(SEM)、X线衍射(XRD)等表征手段对体系的形貌以及物相进行了分析;固体漫反射(DRS),光致发光(PL)、瞬态光电流(TPR)、电化学阻抗(EIS)等表征手段对体系光电性能进行了分析.改性后的Pd_(2-x)In_(x)O_(3)双金属体系相较于In_(2)O_(3)在CO_(2)加氢实验中的转化效率提升了约66倍.Pd的引入不仅促进了大量氧空位(Vo)的生成,为光热催化CO_(2)还原提供大量的吸附活化位点,还可作为杂质能级缩减In_(2)O_(3)的带隙,极大降低了驱动光催化过程的能垒.Pd和Vo良好的协同效应使得体系拥有较高的光热转化效率,表明其在CO_(2)还原反应中的应用潜力.Photothermal catalytic conversion of the CO_(2) pathway reverse water gas shift reaction(RWGS)to CO is a promising approach to address energy and environmental challenges.To develop a more efficient photocatalyst for CO_(2) conversion,bimetallic oxides(Pd_(2-x)In_(x)O_(3))were synthesized by hydrothermal synthesis of MIL-68(In)as a sacrificial template followed by calcination.The morphological structure of the system was analyzed by scanning electron microscope(SEM)and X-ray diffraction(XRD).The optical and electronic properties of the system were analyzed by diffuse reflectance spectra(DRS),Photoluminescence(PL),transient photocurrent(TPR),and electrochemical impedance spectroscopy(EIS).The conversion efficiency of modified Pd_(2-x)In_(x)O_(3) bimetallic system was approximately 66-fold higher than In_( 2 )O_( 3 )in CO_(2) hydrogenation experiments.The introduction of Pd promotes the generation of a large number of oxygen vacancies(V o)to provide a large number of adsorption activation sites for photothermocatalytic CO_(2) reduction.Moreover,Pd serves as a doping level to narrow the band gap of In _(2) O _(3),which greatly reduces the energy barrier driving the photocatalytic process.The synergistic effect of Pd and V o induce the system with high photothermal conversion efficiency,which indicates its potential application in CO_(2) reduction.

关 键 词：CO_(2)加氢 逆水汽转化反应 MIL-68(In) 双金属氧化物 

分 类 号：O644.15[理学—物理化学]