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Synthesis and characterization of niobium-promoted cobalt/iron catalysts supported on carbon nanotubes for the hydrogenation of carbon monoxide

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燃料化学学报 2016年第7期44卷 815-821页

作者： Zahra Gholami Noor Asmawati Mohd Zabidi Fatemeh Gholami Mohammadtaghi Vakili Centralized Analytical Laboratory Universiti Teknologi PETRONAS Department of fundamental and Applied Sciences Universiti Teknologi PETRONAS Department of Mechanical Engineering Faculty of EngineeringUniversity of Malaya School of Industrial Technology Universiti Sains Malaysia

Bimetallic Co /Fe catalysts supported on carbon nanotubes( CNTs) were prepared,and niobium( Nb) was added as promoter to the 70 Co ∶30Fe /CNT catalyst. The physicochemical properties of the catalysts were characterized,and the catalytic performances were analyzed at the same operation conditions( H_2 ∶CO( volume ratio) = 2 ∶1,p = 1 MPa,and t = 260 ℃) in a tubular fixed-bed microreactor system. The addition of Nb to the bimetallic catalyst decreases the average size of the oxide nanoparticles and improves the reducibility of the bimetallic catalyst. Evaluation of the catalyst performance in a Fischer-Tropsch reaction shows that the catalyst results in high selectivity to methane,and the selectivity to C_(5+) increased slightly in the bimetallic catalyst unlike that in the monometallic catalysts. The addition of 1% Nb to the bimetallic catalyst increases CO conversion and selectivity to C_(5+). Meanwhile,a decrease in methane selectivity is observed.

关键词： Fischer-Tropsch synthesis bimetallic catalyst niobium promoter carbon nanotubes

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Development of niobium-promoted cobalt catalysts on carbon nanotubes for Fischer-Tropsch synthesis

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Journal of Natural Gas Chemistry 2011年第6期20卷 659-663页

作者： Sardar Ali Noor Asmawati Mohd Zabidi Duvvuri Subbarao Department of Chemical Engineering Universiti Teknologi PETRONASBandar Seri Iskandar31750 TronohPerakMalaysia Department of fundamental and Applied Sciences Universiti Teknologi PETRONASBandar Seri Iskandar31750 TronohPerakMalaysia

Cobalt-based catalysts were prepared by a wet impregnation method on carbon nanotubes （CNTs） support and promoted with *** were characterized by nitrogen adsorption,TEM,XRD,TPR,TPO and *** of niobium increased the dispersion of cobalt but decreased the catalysts ***-Tropsch synthesis （FTS） was carried out in a fixed-bed microreactor at 543 K,1 atm and H2/CO=2 for 5 *** of niobium enhanced the C5＋ hydrocarbons selectivity by 39% and reduced methane selectivity by 59%.These effects were more pronounced for 0.04%Nb/Co/CNTs catalyst,compared with those observed for other niobium compositions.

关键词： CNTs cobalt niobium Fischer-Tropsch synthesis

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REVIEW OF HIGH LEVEL FAULT MODELING APPROACHES FOR MIXED-SIGNAL SYSTEMS

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Journal of Electronics(China) 2010年第4期27卷 490-497页

作者： Xia Likun Ian Bell Antony Wilkinson Department of Electrical ＆ Electronic Engineering Universiti Teknologi Petronas 31750 Tronoh Perak Malaysia Department of Engineering Hull University Cottingham Road United Kingdom HU57RX

In the modern analogue design, Transistor Level Fault Simulation (TLFS) plays the im-portant part since every fault in the whole circuit has to be simulated at that level. Unfortunately, it is a very CPU intensive task even though it maintains the high accuracy. Therefore, High Level Fault Modeling (HLFM) and High Level Fault Simulation (HLFS) are required in order to alleviate the efforts of simulation. In this paper, different HLFM approaches are reviewed at the device level during last two decades. We clarify their domains of application and evaluate their strengths and current limitations. We also analyze causes of faults and introduce various test approaches.

关键词： High Level Fault Modeling (HLFM) Automated Model Generation (AMG)

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