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structured NiFe catalysts derived from in-situ grown layered double hydroxides on ceramic monolith for CO_(2) methanation

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Green Energy & Environment 2020年第4期5卷 423-432页

作者： Huong Lan Huynh Wakshum Mekonnen Tucho Zhixin Yu Department of Energy and Petroleum Engineering University of Stavanger4036 StavangerNorway Department of Mechanical and Structural Engineering and Material Science University of Stavanger4036 StavangerNorway

Monolithic catalysts for CO_(2) methanation have become an active research area for the industrial development of Power-to-Gas *** this study,we developed a facile and reproducible synthesis strategy for the preparation of structured NiFe catalysts on washcoated cordierite monoliths for CO_(2) *** NiFe catalysts were derived from in-situ grown layered double hydroxides(LDHs)via urea *** influence of different washcoat materials,i.e.,alumina and silica colloidal suspensions on the formation of LDHs layer was investigated,together with the impact of total metal *** LDHs were precipitated on the exterior surface of cordierite washcoated with alumina,while it was found to deposit further inside the channel wall of monolith washcoated with silica due to different intrinsic properties of the colloidal *** the other hand,the thickness of in-situ grown LDHs layers and the catalyst loading could be increased by high metal *** best monolithic catalyst(COR-AluCC-0.5M)was robust,having a thin and well-adhered catalytic layer on the cordierite *** a result,high methane yield was obtained from CO_(2) methanation at high flow rate on this structured NiFe *** monolithic catalysts appeared as promising structured catalysts for the development of industrial methanation reactor.

关键词： CO_(2)methanation structured catalysts In-situ growth Layered double hydroxides Ceramic honeycomb monolith

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Hydrochlorination of Acetylene Using SiC Foam Supported structured C/Au catalysts

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Journal of Materials Science & Technology 2014年第5期30卷 434-440页

作者： Xiaodan Yang Chunhai Jiang Zhenming Yang Jinsong Zhang Institute of Metal Research Chinese Academy of Sciences

AuCl3 loaded structured catalysts were prepared on SiC foam supported with pre-coated activated carbon layers. The catalytic properties of the structured catalysts towards hydrochlorination of acetylene were tested in a fixed- bed reactor with the AuCl3 loaded on activated carbon pellets as a reference. For isopyknic catalysts, the structured catalyst with only one fifth of the Au amount as that was used on the reference catalyst exhibited even a little higher acetylene conversion and much better stability than the latter no matter what the gas hourly space velocities of acetylene were used. The results indicated that the more homogeneous distribution of AuCl3 particles and better heat transfer along the fixed-bed reactor originated from the low pressure drop and high thermal conductivity of the SiC foam supported structured catalysts might be able to account for their improved efficiency and stability. It is befieved that these novel structured C/Au catalysts can be potentially applied in VCM industrialization in view of their greatly reduced cost and much prolonged life.

关键词： structured catalysts Acetylene hydrochlorination Silicon carbide foams Carbon coating Heterogeneous reaction

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Engineering operando methodology： Understanding catalysis in time and space

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 509-536页

作者： Raquel Portela Susana Perez-Ferreras Ana Serrano-Lotina Miguel A. Banares Instituto de Catalisis y Petroleoquimica ICP-CSIC Marie Curie 2 Madrid Spain

The term operando was coined at the begin- ning of this century to gather the growing efforts devoted to establish structure-activity relationships by simulta- neously characterizing a catalyst performance and the relevant surface chemistry during genuine catalytic opera- tion. This approach is now widespread and consolidated; it has become an increasingly complex but efficient junction where spectroscopy, materials science, catalysis and engineering meet. While for some characterization techni- ques kinetically relevant reactor cells with good resolution are recently developing, the knowledge gained with magnetic resonance and X-ray and vibrational spectro- scopy studies is already huge and the scope of operando methodology with these techniques is recently expanding from studies with small amounts of powdered solids to more industrially relevant catalytic systems. Engineering catalysis implies larger physical domains, and thus all sort of gradients. Space- and time- resolved multi-technique characterization of both the solid and fluid phases involved in heterogeneous catalytic reactions （including temperature data） is key to map processes from different perspectives, which allows taking into account existing heterogeneities at different scales and facing up- and down-scaling for applications ranging from microstructured reactors to industrial-like macroreactors （operating with shaped catalytic bodies and/or in integral regime）. This work reviews how operando methodology is evolving toward engineered reaction systems.

关键词： operando structured catalysts spaceresolved time-resolved spectroscopy

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Effect of CeO_2 and Al_2O_3 on the activity of Pd/Co_3O_4/cordierite catalyst in the three-way catalysis reactions(CO/NO/C_nH_m)

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Journal of Environmental Sciences 2012年第7期24卷 1327-1333页

作者： Sergiy O.Soloviev Pavlo I.Kyriienko Nataliia O.Popovych L.V.Pisarzhevsk Institute of Physical Chemistry National Academy of Sciences of Ukraine

The present article studies the effect of CeO2 and A1203 on the activity of Pd/Co304/cordierite catalyst in conversion of NO, CO, CnHm. The catalysts were characterized by temperature programmed reduction with hydrogen, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. It is shown that the effect of CeO2 on the properties of Pd/C03 O4/cordierite catalyst depends on preparation method. The catalyst obtained by co-deposition of cerium and cobalt oxides has higher activity in CO oxidation （CO ＋ 02 and CO ＋ NO） and total hexane oxidation （C6H14 ＋ 02）. Such phenomenon is probably caused by more than stoichiometric amount of formed oxygen vacancies, an increase in both mobility of surface oxygen and dispersity of components in the catalytic composition. It is demonstrated that CeO2 addition promotes the SO2 resistance of Pd/C03 O4/cordierite. The second support decreases the activity of Pd/Co3Oa/cordierite catalyst in the reactions of CO and C6H14 with oxygen because of COA1204 formation.

关键词： metal-oxide catalysts structured catalysts effect of CeO2 and A1203 CO NO CnH,. conversion

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