scholarly journals Kinetic Model of Gas Transport in Carbon Nanotube Channels

2013 ◽  
Vol 117 (15) ◽  
pp. 7656-7660 ◽  
Author(s):  
Aleksandr Noy
Keyword(s):  
Carbon Nanotube ◽  
Kinetic Model ◽  
Gas Transport

Modeling of gas transport in porous medium: Stochastic simulation of the Knudsen gas and a kinetic model with homogeneous scatterer

2020 ◽  
Vol 32 (10) ◽  
pp. 102004
Author(s):  
Shigeru Takata ◽  
Kisho Hatakenaka ◽  
Masanari Hattori ◽  
Fumiyoshi Kasahara
Keyword(s):  
Porous Medium ◽  
Kinetic Model ◽  
Stochastic Simulation ◽  
Gas Transport ◽  
Knudsen Gas

Carbon Nanotube Selective Membranes with Subnanometer, Vertically Aligned Pores, and Enhanced Gas Transport Properties

2015 ◽  
Vol 27 (24) ◽  
pp. 8198-8210 ◽  
Author(s):  
Anastasios Labropoulos ◽  
Charitomeni Veziri ◽  
Maria Kapsi ◽  
George Pilatos ◽  
Vlassis Likodimos ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Transport Properties ◽  
Gas Transport ◽  
Gas Transport Properties ◽  
Vertically Aligned ◽  
Selective Membranes

Evolution of gas transport pattern with the variation of coal particle size: Kinetic model and experiments

2020 ◽  
Vol 367 ◽  
pp. 336-346 ◽  
Author(s):  
Wei Zhao ◽  
Kai Wang ◽  
Yuanping Cheng ◽  
Shimin Liu ◽  
Long Fan
Keyword(s):  
Particle Size ◽  
Kinetic Model ◽  
Coal Particle ◽  
Gas Transport

scholarly journals Dry Reforming of Methane over a Ruthenium/Carbon Nanotube Catalyst

2020 ◽  
Vol 4 (1) ◽  
pp. 16
Author(s):  
Yuan Zhu ◽  
Kun Chen ◽  
Robert Barat ◽  
Somenath Mitra
Keyword(s):  
Carbon Nanotube ◽  
Kinetic Model ◽  
Packed Bed ◽  
Dry Reforming ◽  
Gas Analysis ◽  
Packed Bed Reactor ◽  
Coke Deposition ◽  
Dry Reforming Of Methane ◽  
Reverse Water Gas Shift ◽  
Water Gas

In this study, CH4 dry reforming was demonstrated on a novel microwave-synthesized ruthenium (Ru)/carbon nanotube (CNT) catalyst. The catalyst was tested in an isothermal laboratory-packed bed reactor, with gas analysis by gas chromatography/thermal conductivity detection. The catalyst demonstrated excellent dry-reforming activity at modest temperatures (773–973 K) and pressure (3.03 × 105 Pa). Higher reaction temperatures favored increased conversion of CH4 and CO2, and increased H2/CO product ratios. Slight coke deposition, estimated by carbon balance, was observed at higher temperatures and higher feed CH4/CO2. A robust global kinetic model composed of three reversible reactions—dry reforming, reverse water gas shift, and CH4 decomposition—simulates observed outlet species concentrations and reactant conversions using this Ru/CNT catalyst over the temperature range of this study. This engineering kinetic model for the Ru/CNT catalyst predicts a somewhat higher selectivity and yield for H2, and less for CO, in comparison to previously published results for a similarly prepared Pt_Pd/CNT catalyst from our group.

scholarly journals KINETIKA MIKRO DEKOMPOSISI METANA MENJADI KARBON NANOTUBE PADA PERMUKAAN KATALIS Ni-Cu-Al

REAKTOR ◽  
2011 ◽  
Vol 13 (3) ◽  
pp. 148 ◽  
Author(s):  
Praswasti Pembangun Dyah Kencana Wulan ◽  
Widodo Wahyu Purwanto ◽  
Yuswan Muharam
Keyword(s):  
Carbon Nanotube ◽  
Kinetic Model ◽  
Phase Transfer ◽  
Internal Diffusion ◽  
Exponential Factor ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Decomposition Of Methane ◽  
Rate Limiting ◽  
Kinetics Of

MICRO KINETICS OF DECOMPOSITION OF METHANE TO CARBON NANOTUBES OVER NI-CU-AL CATALYST. The main focus of this research was to obtain micro kinetics decomposition of methane producing carbon nanotube on the surface of the Ni-Cu-Al catalyst. Experimental kinetics data collected at a temperature range of 650-750oC and pressure of one atmosphere. The preliminary test was conducted to obtain the kinetics are not influenced by external and internal diffusion limitations as well as inter-phase transfer. Kinetics data were tested by micro kinetic model derived from the catalyst surface reaction mechanism. The most appropriate kinetic model becomes the rate-limiting step of methane decomposition reaction. Results of preliminary experiment showed that the kinetics of the external diffusion effect is negligible at flow rates above 150 mL/min. Internal diffusion can be ignored with a catalyst under 0.25 mm in diameter with a weight of 0.04 grams of catalyst and contact time 2.5x10-4. Rate equation analysis shows that the rate-limiting step is the adsorption which indicates that intermediate consumption (CH4I + I Û CH3I + HI) is faster than the formation of intermediate (adsorption of methane, CH4 + I Û CH4I). The activation energy obtained for 34.628 kJ/mol and pre-exponential factor of 6.583x106.  Fokus utama penelitian ini adalah memperoleh kinetika mikro dekomposisi metana yang menghasilkan Carbon Nanotube pada permukaan  katalis Ni-Cu-Al. Data kinetika eksperimen diambil pada rentang temperatur 650-750oC dan tekanan 1 atmosfer. Percobaan pendahuluan dilakukan untuk memperoleh daerah kinetika yang tidak dipengaruhi oleh limitasi difusi eksternal dan internal serta perpindahan antar fasa.  Data kinetika  diuji dengan model kinetika mikro yang diturunkan dari mekanisme reaksi permukaan katalis. Model kinetika yang paling sesuai menjadi tahap pembatas laju reaksi dekomposisi metana. Hasil percobaan pendahuluan kinetika menunjukkan bahwa pengaruh difusi eksternal dapat diabaikan pada laju alir di atas 150 mL/menit. Difusi internal dapat diabaikan dengan menggunakan katalis berdiameter di bawah 0,25 mm dengan berat katalis 0,04 gram pada waktu kontak 2,5x10-4. Analisis persamaan laju menunjukkan bahwa tahap pembatas laju adalah tahap adsorpsi yang menunjukkan bahwa konsumsi intermediate (CH4I + I Û CH3I + HI) lebih cepat dari pembentukan intermediate (adsorpsi metana,CH4 + I Û CH4I). Energi aktivasi yang diperoleh sebesar 34,628 kJ/mol dan faktor pre-eksponensial 6,583x106.

Gas transport in vertically-aligned carbon nanotube/parylene composite membranes

Carbon ◽  
2014 ◽  
Vol 66 ◽  
pp. 11-17 ◽  
Author(s):  
Lei Zhang ◽  
Bin Zhao ◽  
Xianying Wang ◽  
Youxuan Liang ◽  
Hanxun Qiu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Gas Transport ◽  
Composite Membranes ◽  
Vertically Aligned
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