摘要
针对精准构建多组分固体催化剂纳米多元界面的难题,鉴于六方晶型氧化亚钴(hcp-CoO)与氧化锌(ZnO)具有超高的晶格匹配度(大于99.8%),采用晶格匹配策略定向构建Pt-Co-ZnO三元界面,设计合成了三元催化剂Pt-ZnO@CoO,并利用扫描电镜(SEM)、扫描透射电镜(STEM)、能量色散X射线光谱(EDX)、X射线衍射(XRD)、电感耦合等离子质谱仪(ICP-MS)、氢气程序升温还原(H_(2)-TPR)、二氧化碳程序升温脱附(CO_(2)-TPD)等方法对其形貌、元素分布、物相结构、元素含量、还原能力和吸附能力进行了表征,进而在固定床反应器上评价了其CO_(2)加氢反应的催化性能。结果表明:在制备的Pt-ZnO@CoO催化剂上,Co、Pt均高度分散于ZnO表面;催化剂经过还原处理,CoO和Pt前体被还原为纳米颗粒,从而形成Pt-Co-ZnO三元界面;Pt-ZnO@CoO催化剂对CO_(2)加氢反应显示出优异的催化活性和稳定性,这是因为其具有高密度的界面位点、较强的还原能力和较强的CO_(2)吸附能力。
Aiming at the difficulty of accurately constructing nanomultiple interface of multi-component solid catalysts,given the extremely high lattice match between hexagonal cobalt(Ⅱ)oxide(hcp-CoO)and zinc oxide(ZnO)(>99.8%),the Pt-ZnO@CoO ternary catalyst was designed and synthesized using lattice matching strategy for targeted construction of ternary interface.The morphology,elemental distribution,phase structure,elemental content,reduction capability,and adsorption capacity of the catalyst were characterized by scanning electron microscopy(SEM),scanning transmission electron microscopy(STEM),energy dispersive X-ray spectroscopy(EDX),X-ray diffraction(XRD),inductively coupled plasma mass spectrometry(ICP-MS),hydrogen programmed temperature reduction(H_(2)-TPR)and carbon dioxide programmed temperature desorption(CO_(2)-TPD),then its catalytic performance for CO_(2)hydrogenation was evaluated in a fixed-bed reactor.The results showed that Co and Pt were highly dispersed on the surface of Pt-ZnO@CoO catalyst,and the precursors of CoO and Pt were reduced to nano-particles after reduction treatment.The Pt-ZnO@CoO catalyst exhibits excellent catalytic performance and stability for CO_(2)hydrogenation,this is because of its high density of the interface sites,strong reduction ability and strong CO_(2)adsorption capacity.
作者
万雅琴
张煜华
李金林
王立
Wan Yaqin;Zhang Yuhua;Li Jinlin;Wang Li(Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,Hubei Key Laboratory of Catalysis and Materials Science,College of Chemistry and Materials Science,South-Central Minzu University,Wuhan 430074)
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2024年第2期144-152,共9页
Petroleum Processing and Petrochemicals
基金
国家自然科学基金资助项目(22072184,22372199)。
