scholarly journals Single-walled carbon nanotube supported Pt-Ru bimetallic superb nanocatalyst for the hydrogen generation from the methanolysis of methylamine-borane at mild conditions

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Eda Gokirmak Sogut ◽  
Hilal Acidereli ◽  
Esra Kuyuldar ◽  
Yasar Karatas ◽  
Mehmet Gulcan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Hydrogen Generation ◽  
Catalyst System ◽  
Metal Nanoparticle ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Different Temperatures

Abstract Several metal nanoparticle based catalysts have been synthesized for catalyzing the hydrogen production process by hydrolysis of methylamine-borane (MeAB). However, there was only one study that catalyzes the producing of hydrogenvia the methanolysis of MeAB, and it was carried out by our research group. For this reason, in this work, a new catalyst system entitled by single-walled carbon nanotube (SWCNT) supported bimetallic platinum-ruthenium nanoparticles were developed and called as PtRu@SWCNT. These NPs were characterized by several techniques (XRD, XPS, Raman, and TEM), and they were performed for the methanolysis of MeAB with high catalytic activity. The prepared PtRu@SWCNT NPs were also tested in the methanolysis of MeAB at different parameters including different temperatures, catalyst and substrate concentrations, and reusability performance. Experimental results revealed that the new PtRu@SWCNT NPs had excellent catalytic activity and reusability for removing of hydrogen from the methanolysis of MeAB at ambient conditions. According to the obtained data, the turnover frequency is 136.25 mole H2/mole PtRu × min, and the activation energy (Ea) is 17.29 kJ/mole. More than 99% of conversion was observed at room temperature.

Tenfold catalytic activity enhancement of Pt∕C by doping with single walled carbon nanotube for methanol oxidation

2007 ◽  
Vol 90 (6) ◽  
pp. 063112 ◽  
Author(s):  
Jayasri Narayanamoorthy ◽  
Sumitha Durairaj ◽  
Youngsik Song ◽  
Yuan Xu ◽  
Jaewu Choi
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Methanol Oxidation ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Activity Enhancement

In situ Synthesis of Reduced Graphene Oxide Supported CoMo Nanoparticles as Efficient Catalysts for Hydrogen Generation from NH3BH3

2018 ◽  
Vol 232 (3) ◽  
pp. 431-443 ◽  
Author(s):  
Xigang Du ◽  
Yonghua Duan ◽  
Jun Zhang ◽  
Gang Mi
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Hydrogen Generation ◽  
Sodium Molybdate ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Reduced Graphene

AbstractCoMo nanoparticles (NPs) supported on reduced graphene oxide (RGO) were synthesized by a one-stepin situco-reduction of an aqueous solution of cobalt(II) chloride, sodium molybdate dihydrate and graphene oxide (GO) using NaBH4as the sole reductant under ambient conditions. The powder XRD, FTIR, EDS and TEM were employed to characterize the structure, size and composition of the CoMo/RGO catalysts. The as-synthesized Co0.9Mo0.1/RGO catalysts exhibited high catalytic activity for the hydrolytic dehydrogenation of ammonia borane (AB) at room temperature. The as-synthesized Co0.9Mo0.1/RGO nanocatalysts exhibited much higher catalytic activity than Co/RGO, Mo/RGO and the RGO-free Co0.9Mo0.1counterpart. Moreover, kinetic studies indicate that the catalytic hydrolysis of AB by Co0.9Mo0.1/RGO has first order kinetics with respect to the the catalyst concentration, but zero order kinetics with respect to the substrate concentration. The Co0.9Mo0.1/RGO catalyst has a turnover frequency (TOF) of 15.8 mol H2·(mol·Co0.9Mo0.1/RGO)−1·min−1at 25°C. Furthermore, the Co0.9Mo0.1/RGO show good recyclability for hydrogen generation from an aqueous solution of AB, which enables the practical reuse of the catalysts. Hence, this general method can be easily extended to the facile preparation of other RGO-based metallic systems.

Dynamical Behavior of Water Inside a Capped Single-Walled Carbon Nanotube

2008 ◽  
Author(s):  
Jian-Ming Lu ◽  
Chun-Yi Wu ◽  
Cheng-Shiu Hung ◽  
Wen-Tung Chien ◽  
Wang-Long Li ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Md Simulation ◽  
Dynamical Behavior ◽  
Transient State ◽  
Md Simulations ◽  
Simulation Method ◽  
Vibrational Amplitude ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Different Temperatures

Dynamical behavior of water confined inside a capped single-walled carbon nanotube (SWCNT) is investigated at different temperatures via the Molecular Dynamics (MD) Simulation method. Water in a SWCNT behaves in the fashion of random walk and increases amplitudes with temperature. Moreover, the SWCNT’s tip vibrates more significantly as temperature increases. The water molecules embedded nanotubes exhibit less thermal noise amplitude, indicating increases in effective stiffness in the water-nanotube composite. Further, the vibrational amplitude of a water-embedded SWCNT’s tip is more noticeable during the initial transient state at the beginning of our MD simulations, and gradually decays, and reaches a steady state, as MD simulation time increases. The variation of vibrating amplitude of the SWCNT’s tip increases linearly as temperature increases when no water is present inside. The tip vibration exhibits the largest amplitude when temperature is at the boiling point of water. Moreover, the tip vibration increases monotonically as temperature increases, providing information to estimate the effective Young’s modulus of the water-nanotube composite. The diffusion pathways of water inside a SWCNT are also studied in terms of temperature changes.

Evolution, Activity, and Lifetime of Alumina-supported Fe Catalyst During Super Growth of Single-walled Carbon Nanotube Carpets: Influence of the Type of Alumina

2010 ◽  
Vol 1258 ◽  
Author(s):  
Placidus Amama ◽  
Cary Pint ◽  
Seung Min Kim ◽  
Kurt Eyink ◽  
Eric Stach ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Strong Dependence ◽  
Catalyst Support ◽  
Atomic Layer ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Alumina Films ◽  
Fe Catalyst ◽  
Cvd Growth

AbstractThe influence of the type of alumina used as catalyst support on the evolution, activity, and lifetime of the catalyst during water-assisted CVD growth (or ‘supergrowth') of single-walled carbon nanotube (SWNT) carpets has been studied. The catalyst consisted of a thin Fe film supported on alumina films deposited by different methods: atomic layer deposition (ALD), e-beam, and magnetron sputtering. In order to fully understand the influence of the type of alumina on SWNT carpet growth, crystalline alumina (c-cut sapphire) and annealed alumina deposited by e-beam were also used as catalyst supports. The activity and lifetime of Fe catalyst during SWNT carpet growth showed a strong dependence on the type of alumina used as support. Fe supported on sputtered alumina (sputtered/Fe) showed the highest catalytic activity and lifetime, which was closely followed by e-beam/Fe while Fe supported on sapphire (sapphire/Fe) showed the least catalytic activity and lifetime. AFM, XPS depth profile, variable angle spectroscopic ellipsometry (VASE) studies revealed that the catalyst evolution and the porosity of the different alumina supports correlate with the lifetime and activity of the catalysts.

Novel properties of 0D metal–organic polyhedra bonded to the surfaces of 2D graphene and 1D single-walled carbon nanotubes

2017 ◽  
Vol 46 (25) ◽  
pp. 7998-8003 ◽  
Author(s):  
Ram Kumar ◽  
C. N. R. Rao
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Surface Area ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Metal Organic ◽  
Walled Carbon Nanotubes

Stabilization of individual 0D metal–organic polyhedra (MOP) on 2D graphene and 1D single-walled carbon nanotube (SWNT) surfaces results in a significant improvement of porosity, surface area and catalytic activity of the composites.

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