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Controlling the Reconstruction of Ni/CeO_(2) Catalyst during Reduction for Enhanced CO Methanation

Engineering 2022年第7期8卷 94-99页

作者： Xinyu Cao Tiancheng Pu bar mosevitzky lis Israel E.Wachs Chong Peng Minghui Zhu Yongkang Hu State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Operando Molecular Spectroscopy and Catalysis Research Laboratory Department of Chemical and Biomolecular EngineeringLehigh UniversityBethlehemPA 18015USA Department of Instrument Science and Engineering School of Electronic InformationElectrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Dalian Research Institute of Petroleum and Petrochemicals SINOPECDalian 116045China

Reductive pretreatment is an important step for activating supported metal catalysts but has received little *** this study,reconstruction of the supported nickel catalyst was found to be sensitive to pretreatment *** contrast to the traditional activation procedure in hydrogen,activating the catalyst in syngas created supported Ni nanoparticles with a polycrystalline structure containing an abundance of grain *** unique post-activation catalyst structure offered enhanced CO adsorption and an improved CO methanation *** current strategy to tune the catalyst structure via manipulating the activation conditions can potentially guide the rational design of other supported metal catalysts.

关键词： Nickel–ceria catalyst Catalyst activation Crystallinity Methanation In situ spectroscopy

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Utility of direct 3D co-culture model for chondrogenic differentiation of mesenchymal stem cells on hyaluronan scaffold(Hyaff-11)

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Regenerative Biomaterials 2020年第6期7卷 543-552页

作者： Iwona Deszcz Anna lis-Nawara Piotr Grelewski Szymon Dragan Julia bar Department of Immunopathology and Molecular Biology Wroclaw Medical UniversityBujwida 4450-345 WroclawPoland Department and Clinic of Orthopedic and Traumatologic Surgery Wroclaw Medical UniversityBujwida 4450-345 WroclawPoland

This study presents direct 2D and 3D co-culture model of mesenchymal stem cells(MSCs)line with chondrocytes isolated from patients with osteoarthritis(unaffected area).MSCs differentiation into chondrocytes after 14,17 days was checked by estimation of collagen Ⅰ,Ⅱ,Ⅹ,aggrecan expression using ***,localization of cells on Hyaff-11 was performed using enzymatic technique and THUNDER Imaging *** showed,that MSCs/chondrocytes 3D co-culture induced suitable conditions for chondrocytes grow and MSCs differentiation than 2D *** that differentiated cells on Hyaff-11 expressed collagen Ⅹ,they showed high collagen Ⅱ(80%)and aggrecan(60%)expression with simultaneous decrease of collagen Ⅰ expression(10%).The high concentration of differentiated cells on Hyaff-11,indicate that this structure has an impact on cells cooperation and *** conclusion,we suggest that high expression of collagen Ⅱ and aggrecan in 3D co-culture model,indicate that cooperation between different subpopulations may have synergistic impact on MSCs chondrogenic *** the high concentration and localization of cells growing in deeper layers of membrane in 3D co-culture,indicate that induced microenvironmental enhance cell migration within ***,we suggest that co-culture model might be useful for construction a bioactive structure for cartilage tissue regeneration.

关键词： articular cartilage regeneration chondrogenesis direct co-culture Hyaff-11

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