نتایج جستجو برای: porous catalyst

تعداد نتایج: 92382  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1391

in this thesis, we exploit a simple and suitable method for immobilization of copper(ii) complex of 4?-phenyl-terpyridine on activated multi-walled carbon nanotubes [amwcnts-o-cu(ii)-phtpy]. this nanostructure was characterized by various physico-chemical techniques. to ensure the efficiency and fidelity of copper species, the implementation of three-component strategies in click-chemistry all...

2016
Haolin Tang Shichang Cai Shilei Xie Zhengbang Wang Yexiang Tong Mu Pan Xihong Lu

A new class of dual metal and N doped carbon catalysts with well-defined porous structure derived from metal-organic frameworks (MOFs) has been developed as a high-performance electrocatalyst for oxygen reduction reaction (ORR). Furthermore, the microbial fuel cell (MFC) device based on the as-prepared Ni/Co and N codoped carbon as air cathode catalyst achieves a maximum power density of 4335.6...

Journal: :Angewandte Chemie 2014
Feng Wang Jerrik Mielby Felix Herrmann Richter Guanghui Wang Gonzalo Prieto Takeshi Kasama Claudia Weidenthaler Hans-Josef Bongard Søren Kegnæs Alois Fürstner Ferdi Schüth

We describe a solid polyphenylene support that serves as an excellent platform for metal-catalyzed reactions that are normally carried out under homogeneous conditions. The catalyst is synthesized by palladium-catalyzed Suzuki coupling which directly results in formation of palladium nanoparticles confined to a porous polyphenylene network. The composite solid is in turn highly active for furth...

Journal: :Chemical communications 2016
Anindita Chakraborty Sohini Bhattacharyya Arpan Hazra Ashta Chandra Ghosh Tapas Kumar Maji

A new 3D porous anionic MOF (AMOF-1) based on Zn(II) and a flexible tetracarboxylate linker has been synthesized. AMOF-1 showed potential for capture and removal of toxic metal ions from aqueous solution with a detection limit in the ppm level. The Cu(II)@AMOF-1' hybrid obtained by post-synthetic metalation is studied as a heterogeneous catalyst for the synthesis of benzimidazole derivatives.

A series of Fe3O4 supported on mesoporous FDU-12 silica systems were prepared by the hydrothermal conditions. The surface properties of the functionalized catalyst were analyzed by a series of characterization techniques like FTIR, XRD, N2 adsorption–desorption and TEM. XRD and adsorption–desorption analysis shows that the mesostructure of FDU silica remains intact after Fe3O4 modifications, wh...

Journal: :Chemical communications 2015
Jie Liu Jieshun Cui Filipe Vilela Jun He Matthias Zeller Allen D Hunter Zhengtao Xu

In a metal-free procedure, chelating thiol groups and an electrophile react to assemble a robust, conjugated porous polymer with pendant aldehyde functionalities. These groups are able to reduce Ag(i) ions to generate, in situ, Ag(0) nanoparticles evenly dispersed in the polymer matrix. The Ag(0)-polymer composite enables selective reduction of aromatic nitro compounds as a heterogeneous cataly...

Journal: :ACS applied materials & interfaces 2014
Firat Güder Elias Frei Umut M Kücükbayrak Andreas Menzel Ralf Thomann Roman Luptak Bernd Hollaender Ingo Krossing Margit Zacharias

Catalytically synthesized methanol from H2 and CO2 using porous Cu/ZnO aggregates is a promising, carbon neutral, and renewable alternative to replace fossil fuel based transport fuels. However, the absence of surface-engineered model systems to understand and improve the industrial Cu/ZnO catalyst poses a big technological gap in efforts to increase industrial methanol conversion efficiency. I...

2014
Petri Kanninen Maryam Borghei Virginia Ruiz Esko I. Kauppinen Tanja Kallio

The performance and stability of a direct methanol fuel cell (DMFC) with membrane electrode assemblies (MEA) using different Nafion contents (30, 50 and 70 wt % or MEA30, MEA50 and MEA70, respectively) and graphitized carbon nanofiber (GNF) supported PtRu catalyst at the anode was investigated by a constant current measurement of 9 days (230 h) in a DMFC and characterization with various techni...

Journal: :iranian journal of catalysis 0
hamid aliyan department of chemistry, shahreza branch, islamic azad university, 86145-311, iran.

fe3o4-containing cotton-like mesoporous silica system (fe3o4@ncsm) was studied with regard to its performance towards the photodecolorization of bromothymol blue (btb) aqueous solution. the surface properties of the functionalized catalyst were analyzed by a series of characterization techniques like ftir, xrd, bet, sem and tem. the n2 adsorption–desorption analysis shows that the mesostructure...

2017
Panpan Li Mingyuan Zhu Zhiqun Tian Yang Han Yu Zhang Tuantuan Zhou Lihua Kang Xuhong Guo Feng Yu Qiang Wang Bin Dai

Expanded multilayered vermiculite (VMT) was successfully used as catalyst support and Ni/VMT synthesized by microwave irradiation assisted synthesis (MIAS) exhibited excellent performance in our previous work. We also developed a two-dimensional porous SiO2 nanomesh (2D VMT-SiO2) by mixed-acid etching of VMT. Compared with three-dimensional (3D) MCM-41, 2D VMT-SiO2 as a catalyst support provide...

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