نتایج جستجو برای: based catalyst

تعداد نتایج: 2970333  

Journal: :Dalton transactions 2015
Mohammad Mahdi Najafpour Saeideh Salimi

Herein we report that the reaction of KMnO4 with cobalt nanoparticles coated with multiple graphene layers forms a promising catalyst toward water oxidation. The compound was characterized by scanning electron microscopy, energy-dispersive spectroscopy, high resolution transmission electron microscopy, X-ray diffraction, electronic spectroscopy, Fourier transform infrared spectroscopy, and atom...

Journal: :IBM Journal of Research and Development 2005
Thomas P. Moffat Daniel Wheeler Monica D. Edelstein Daniel Josell

Superconformal electrodeposition of copper is explained by the recently developed curvature-enhanced-accelerator coverage (CEAC) model, which is based on the assumptions that 1) the local growth velocity is proportional to the surface coverage of the accelerator, or catalyst, and 2) the catalyst remains segregated at the metal/electrolyte interface during copper deposition. For growth on nonpla...

Journal: :Dalton transactions 2015
Julianne M Thomsen Daria L Huang Robert H Crabtree Gary W Brudvig

Organometallic Ir precatalysts have been found to yield homogeneous Ir-based water-oxidation catalysts (WOCs) with very high activity. The Cp*Ir catalyst series can operate under a variety of regimes: it can either act as a homogeneous or a heterogeneous catalyst; it can be driven by chemical, photochemical, or electrochemical methods; and the molecular catalyst can either act in solution or su...

Journal: :Talanta 2011
Cornelius T Martha Jan-Carel Hoogendoorn Hubertus Irth Wilfried M A Niessen

Current development in catalyst discovery includes combinatorial synthesis methods for the rapid generation of compound libraries combined with high-throughput performance-screening methods to determine the associated activities. Of these novel methodologies, mass spectrometry (MS) based flow chemistry methods are especially attractive due to the ability to combine sensitive detection of the fo...

Journal: :ACS nano 2016
Yanhong Lu Yang Yang Tengfei Zhang Zhen Ge Huicong Chang Peishuang Xiao Yuanyuan Xie Lei Hua Qingyun Li Haiyang Li Bo Ma Naijia Guan Yanfeng Ma Yongsheng Chen

Ammonia synthesis is the single most important chemical process in industry and has used the successful heterogeneous Haber-Bosch catalyst for over 100 years and requires processing under both high temperature (300-500 °C) and pressure (200-300 atm); thus, it has huge energy costs accounting for about 1-3% of human's energy consumption. Therefore, there has been a long and vigorous exploration ...

Journal: :Science 2016
John Jones Haifeng Xiong Andrew T DeLaRiva Eric J Peterson Hien Pham Sivakumar R Challa Gongshin Qi Se Oh Michelle H Wiebenga Xavier Isidro Pereira Hernández Yong Wang Abhaya K Datye

Catalysts based on single atoms of scarce precious metals can lead to more efficient use through enhanced reactivity and selectivity. However, single atoms on catalyst supports can be mobile and aggregate into nanoparticles when heated at elevated temperatures. High temperatures are detrimental to catalyst performance unless these mobile atoms can be trapped. We used ceria powders having simila...

2006
S. Al-Khattaf

Catalytic transformation of 1,2,4-trimethyl benzene has been investigated over two different USY zeolite based catalysts in a novel riser simulator at different operating conditions. FCC-SY catalyst has low acidity and FCC-CY contains high acidity. The effect of reaction conditions on the variation of isomerization to disproportionation products ratio (I/D), distribution of trimethylbenzene (TM...

2014
Sergio Velázquez José M. Monzó María V. Borrachero Jordi Payá

The pozzolanic activity of the spent catalyst produced by fluid catalytic cracking (FCC) has been studied by various methods in recent years. However, no quick and easy method has been reported for this activity based on the associated studies. In this work, the pozzolanic activity of a spent catalyst was investigated by measuring its electrical conductivity in aqueous suspensions of pozzolan/c...

A novel magnetite nanoparticle-based heterogeneous acidic catalyst [Fe3O4@SiO2@Am-PPC-SO3H] [HSO4] was successfully prepared and characterized by SEM, EDX, TGA, VSM and FT-IR techniques. The magnetically retrievable and sustainable catalyst was investigated in the reaction of aldehyde and o-aminophenol for the synthesis of benzoxazoles. The...

Mohammad Yari Omid Moradi Sajjad Sedaghat Sharehjini

Surface oxidized carbon vulcane XC-72 is prepared as catalyst support and platinumnanoparticles are chemically anchored onto the modified surface. The nanoparticles of Pt weresynthesized by reduction of H2PtCl6 with sodium borohydride in a 5.5 M buffer solution ofsodium citrate; the complexation of citrate with metal ions is beneficial to the formation ofnanoparticles. The electro-oxidation of ...

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