空间异质的双层空心球催化剂制备及等离子体催化CO_(2)还原研究

Preparation of spatially heterogeneous hollow sphere catalysts and research on plasma catalytic CO_(2) reduction

催化剂空间结构与催化性能密切相关。采用水热法可宏量制备环境友好型且均匀的生物质碳球作为模板,通过浸渍法吸附金属离子,并结合二次表面包覆SiO_(2),制备了空间异质的金属氧化物@SiO_(2)空心球催化剂(MO@SiO_(2))。通过控制实验条件(浓度,时间等),可以简单灵活地制备外层二氧化硅厚度和内层金属氧化物种类可调变的多种空间异质空心结构。表征了所制备的各类催化剂,详细分析研究了催化剂的形貌、组分等。通过测试等离子体CO_(2)催化加氢,发现CoO_(x)(36 h)@SiO_(x)(6 h)的效果最好。此种空间异质的空心结构为研究工业气体催化提供了很好的反应空间,是微纳米反应器耦合低温等离子体催化研究串联反应的优良体系。

The spatial structure of catalyst is closely related to its catalytic performance.The uniform and environmental friendly biomass carbon spheres prepared by hydrothermal method were used as the hard templates for fabricating hollow structure.The spatially heterogeneous metal oxide@SiO_(2) hollow spherical catalyst(MO@SiO_(2))was prepared by metal ions immersion method combining with surface coating SiO_(2).By tuning experimental conditions(concentration,time,etc.),a variety of space heterogeneous hollow structures with adjustable outer silica thickness and inner metal oxide types can be prepared simply and flexibly.The well-prepared catalysts were characterized.The morphology and composition of catalyst were studied in detail.It was found that CoO_(x)(36 h)@SiO_(x)(6 h)had the best performance for plasma CO_(2) catalytic hydrogenation.The heterogeneous hollow structure provides a good reaction space for the study of industrial gas catalysis.The micro-nano reactor coupling with non-thermal plasma system is an excellent platform for cascade reaction.