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Structured hierarchical mn–co mixed oxides supported on silicalite-1 foam catalyst for catalytic combustion

Chinese Journal of Chemical Engineering 2020年第9期28卷 2319-2327页

作者： Yanan Guan Hengyu Shen Xing Guo Boyang Mao Zhenyuan Yang Yangtao Zhou He Liang Xiaolei Fan Yilai Jiao jinsong Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730010China Department of Engineering University of CambridgeJJ Thomson AvenueCambridge CB30FAUnited Kingdom Department of Eye and Vision Science Institute of Life Course and Medical SciencesUniversity of Liverpool6 WestDerby StreetLiverpoolL78TXUnited Kingdom Department of Chemical Engineering and Analytical Science School of EngineeringThe University of ManchesterOxford RoadManchesterM139PLUnited Kingdom

Silicalite-1(S1)foam was functionalized by supporting manganese-cobalt(mn-co)mixed oxides to develop the structured hierarchical catalyst(mn-co@SlF)for catalytic combustion for the first *** self-supporting S1 foam with hierarchical porosity was prepared via hydrothermal synthesis with polyurethane(PU)foam as the ***,mn-co oxide nano sheets were uniformly grown on the surface of S1 foams under hydrothermal conditions to prepare the structured hierarchical catalyst with specific surface area of 354 m^2·g^-1,micropore volume of 0.141 cm^3·g^-1 and total pore volume of 0.217 cm3·g^-1,as well as a good capacity to adsorb toluene(1.7 mmol·g^-1 at p/p0=0.99).comparative catalytic combustion of toluene of over developed structured catalyst mn-co@SlF was performed against the control catalysts of bulk mn-co@S1(i.e.,the crushed mn-co@SlF)and unsupported mn-co oxides(i.e.,mn-co).mn-co@SlF exhibited comparatively the best catalytic performance,that is,complete and stable toluene conversion at 2480 C over 65 h due to the synergy between mn-co oxides and S1 foam,which provided a large number of oxygen vacancies,high redox *** addition,the hierarchical porous structure also improved the accessibility of active sites and facilitated the global mass transfer across the catalyst bed,being beneficial to the catalysis and catalyst longevity.

关键词： Structured catalyst Silicalite-1 mn-co oxides Cellular foam Catalytic combustion

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