Nickel-based cerium zirconate inorganic complex structures for CO_(2)valorisation via dry reforming of methane  

作　　者：Juan Luis Martín-Espejo Loukia-Pantzechroula Merkouri Jesús Gándara-Loe José Antonio Odriozola Tomas Ramirez Reina Laura Pastor-Pérez 

机构地区：[1]Department of Inorganic Chemistry and Material Sciences Institute of Seville,University of Seville-CSIC,Seville 41092,Spain [2]Department of Chemical and Process Engineering,University of Surrey,Guildford GU27XH,United Kingdom

出　　处：《Journal of Environmental Sciences》2024年第6期12-23,共12页环境科学学报（英文版）

基　　金：supported by grant PID2019-108502RJ-I00 and grant IJC2019-040560-I both funded by MCIN/AEI/10.13039/501100011033;RYC2018-024387-I funded by MCIN/AEI/10.13039/501100011033 and by ESF Investing in your future。

摘　　要：The increasing anthropogenic emissions of greenhouse gases(GHG)is encouraging extensive research in CO_(2)utilisation.Dry reforming of methane(DRM)depicts a viable strategy to convert both CO_(2)and CH4into syngas,a worthwhile chemical intermediate.Among the different active phases for DRM,the use of nickel as catalyst is economically favourable,but typically deactivates due to sintering and carbon deposition.The stabilisation of Ni at different loadings in cerium zirconate inorganic complex structures is investigated in this work as strategy to develop robust Ni-based DRM catalysts.XRD and TPR-H2analyses confirmed the existence of different phases according to the Ni loading in these materials.Besides,superficial Ni is observed as well as the existence of a CeNiO_(3)perovskite structure.The catalytic activity was tested,proving that 10 wt.%Ni loading is the optimum which maximises conversion.This catalyst was also tested in long-term stability experiments at 600and 800℃in order to study the potential deactivation issues at two different temperatures.At 600℃,carbon formation is the main cause of catalytic deactivation,whereas a robust stability is shown at 800℃,observing no sintering of the active phase evidencing the success of this strategy rendering a new family of economically appealing CO_(2)and biogas mixtures upgrading catalysts.

关 键 词：CO_(2)conversion Dry reforming of methane Nickel catalysts PYROCHLORE Cerium zirconate 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]