High CO_(2)permeation using a new Ce_(0.85)Gd_(0.15)O_(2-δ)-LaNiO_(3)composite ceramic–carbonate dual-phase membrane  

作　　者：Daniela González-Varela JFrancisco Gómez-García Gustavo Tavizon Heriberto Pfeiffer 

机构地区：[1]Instituto de Investigaciones en Materiales,Universidad Nacional Autónoma de México,Cd.Universitaria,Del.Coyoacán,CP 04510,Ciudad de México,México [2]Departamento de Física y Química Teórica,Facultad de Química,Universidad Nacional Autónoma de México,Cd.Universitaria,Del.Coyoacán,CP 04510,Ciudad de México,México [3]不详

出　　处：《Journal of Environmental Sciences》2024年第6期219-229,共11页环境科学学报（英文版）

基　　金：supported by the PAPIIT-UNAM project numbers IN-205823 and IA-107123;DGV thanks to PNPC–CONACyT for her Ph.D.scholarship。

摘　　要：This work shows the synthesis,characterization and evaluation of dense-ceramic membranes made of Ce_(0.85)Gd_(0.15)O_(2-δ)-LaNiO_(3)(CG-LN)composites,where the fluorite-perovskite ratio(CG:LN)was varied as follows:75:25,80:20 and 85:15 wt.%.Supports were initially characterized by XRD,SEM and electrical conductivity(using vacuum and oxygen atmospheres),to determine the composition,microstructural and ionic-electronic conductivity properties.Later,supports were infiltrated with an eutectic carbonates mixture,producing the corresponding dense dual-phase membranes,in which CO_(2)permeation tests were conducted.Here,CO_(2)permeation experiments were performed from 900 to 700℃,in the presence and absence of oxygen(flowed in the sweep membrane side).Results showed that these composites possess high CO_(2)permeation properties,where the O_(2)addition significantly improves the ionic conduction on the sweep membrane side.Specifically,the GC80-LN20 composition presented the best results due to the following physicochemical characteristics:high electronic and ionic conductivity,appropriate porosity,interconnected porous channels,as well as thermal and chemical stabilities between the composite support and carbonate phases.

关 键 词：CO_(2)permeation Doped CeO_(2) LaNiO_(3) IMPEDANCE Ceramic carbonate membrane 

分 类 号：X701[环境科学与工程—环境工程] TB383.2[一般工业技术—材料科学与工程]