Effect of Operating Conditions for Higher Alcohols Synthesis from Synthesis Gas over Alkali-Modified Co-Rh-Mo Trimetallic Catalyst Supported on Multi-Walled Carbon Nanotubes

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Venkateswara Rao Surisetty ◽  
Janusz Kozinski ◽  
Ajay K. Dalai
Keyword(s):  
Carbon Nanotubes ◽  
Synthesis Gas ◽  
Fixed Bed ◽  
Operating Conditions ◽  
Fixed Bed Reactor ◽  
Optimum Operating ◽  
Higher Alcohols ◽  
Higher Alcohols Synthesis ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The effects of operating conditions on the higher alcohols synthesis reaction from synthesis gas were studied in a single-pass tubular downflow fixed-bed reactor, using sulfided K-promoted trimetallic Co-Rh-Mo catalyst supported on multi-walled carbon nanotubes (MWCNTs). The p CO conversion increased monotonically with increasing reaction temperature (from 275 to 350°C) and pressure (from 800 to 1400 psi), while decreasing monotonically with increasing GHSV (from 2.4 to 4.2 m3 (STP)/(kg of cat./h)). To maximize the ethanol STY and selectivity, the optimum operating conditions were determined as 330°C, 1320 psi, and 3.8 m3 (STP)/kg of cat./h). Maximum ethanol STY and selectivity were obtained using gas with H2 to CO molar ratio around 1.25.

scholarly journals Naproxen removal by CWPO with Fe3O4/multi-walled carbon nanotubes in a fixed-bed reactor

2021 ◽  
Vol 9 (2) ◽  
pp. 105110
Author(s):  
Y. Huaccallo-Aguilar ◽  
S. Álvarez-Torrellas ◽  
M. Larriba ◽  
V.I. Águeda ◽  
J.A. Delgado ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Continuous Fixed-Bed Column Studies of Textile Effluent Treatment using Multi-Walled Carbon Nanotubes Originated from Rosmarinus officinalis Oil

2022 ◽  
Vol 10 (4) ◽  
pp. 22-30
Author(s):  
S. Valliammai ◽  
K. Gopal ◽  
R. Nithya ◽  
L. Rama Priya ◽  
D. Kavitha
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Service Time ◽  
Fixed Bed ◽  
Rosmarinus Officinalis ◽  
Time Model ◽  
Fixed Bed Column ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Bed Depth Service Time

A continuous adsorption study in a fixed-bed column was carried out using Multi-walled Carbon Nanotubes derived from Rosmarinus officinalis oil as an adsorbent for removing the textile dye Acid blue 40 from an aqueous solution. The adsorbent, MWNTs were prepared from Rosmarinus officinalis oil as a precursor to Fe/Mo catalyst supported on silica at 650 ºC under N2 atmosphere by spray pyrolysis process characterized by scanning electron microscopy, Transmission Electron microscopy, and Raman spectroscopy. The effects of adsorbent bed height (2–6 cm), initial ion concentration (20– 60 mg/L), and flow rate (10–30 mL/min) on the column performance were analyzed. The breakthrough curve was analyzed using the mathematical models of Thomas, Yoon-Nelson, and bed depth service time. The Thomas model at different conditions defined the behaviors of the breakthrough curves. The bed depth service time model showed good agreement with the experimental data. The high values of correlation coefficients (R2 0.9875) obtained indicate the validity of the bed depth service time model for the present column system.

Influence of the operating conditions on the production rate of multi-walled carbon nanotubes in a CVD reactor

Carbon ◽  
2004 ◽  
Vol 42 (8-9) ◽  
pp. 1473-1482 ◽  
Author(s):  
C. Gommes ◽  
S. Blacher ◽  
Ch. Bossuot ◽  
P. Marchot ◽  
J. B.Nagy ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Production Rate ◽  
Operating Conditions ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Study on the Influences of Ultrasonic Conditions on the Dispersion of Multi-Walled Carbon Nanotubes in Reinforced Epoxy

2013 ◽  
Vol 561 ◽  
pp. 47-53
Author(s):  
Yu Mei Ding ◽  
Jian Qiang Wang ◽  
Ying An ◽  
Jian Bo Shao ◽  
Kun Ma ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Epoxy Resin ◽  
Operating Conditions ◽  
Suspension Stability ◽  
Ultrasonic Power ◽  
Ultrasonic Time ◽  
Resin Solution ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Ultrasonic Conditions

Absrtract. In this paper, the method of ultrasonic vibration in preparation of multi-walled carbon nanotubes(MWCNTs)/epoxy resin composites was studied. Suspension specimens of MWCNTs/epoxy resin solution prepared by different ultrasonic conditions were compared to find out the influences of operating conditions on dispersion properties. In this study, transmission electron microscopes(TEM) were used to characterize the morphology of the blends and suspension stability was used to evaluate the stability of blends. The results showed that ultrasonic power, ultrasonic time and material quantity have great effect on the dispersion of MWCNTs in epoxy resin solution. Increasing ultrasonic power and time can improve dispersion of MWCNTs, and decreasing material quantity within an appropriate range was helpful to disperse MWCNTs into epoxy resin solution. The results of suspension stability were very similar with TEM results, which demonstrate that suspension stability of MWCNTs/epoxy resin blending could be used as an assistant method to characterize the dispersion of MWCNTs in epoxy resin.

scholarly journals Adsorption of 2,4-dichlorophenoxyacetic acid using rice husk biochar, granular activated carbon, and multi-walled carbon nanotubes in a fixed bed column system

2018 ◽  
Vol 78 (8) ◽  
pp. 1812-1821 ◽  
Author(s):  
Mehdi Bahrami ◽  
Mohammad Javad Amiri ◽  
Bahareh Beigzadeh
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbon ◽  
Flow Rate ◽  
Fixed Bed ◽  
Dichlorophenoxyacetic Acid ◽  
Fixed Bed Column ◽  
Column System ◽  
Multi Walled Carbon Nanotubes ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Walled Carbon Nanotubes

Abstract The 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide, as an aromatic hydrocarbon, is a dangerous and toxic organic pollutant among the agricultural pesticides. In this research, the performance of the biochar made from rice husk (BRH), granular activated carbon (GAC), and multi-walled carbon nanotubes (MWCNTs) was investigated for adsorption of 2,4-D in a fixed-bed column system. The influence of pH (2, 5, 7, 9), flow rate (0.5, 1, 1.5 mL min−1), bed depth (3, 6, 9 cm), and influent 2,4-D concentration (50, 100, 150, 300 mg L−1) on the adsorption process was evaluated. The resulting breakthrough curves indicated that the higher removal efficiency of 2,4-D took place at the lower flow rate, lower influent 2,4-D concentration, higher bed depth, and lower pH. While in most cases the removal ability of GAC was better than other adsorbents, generally, this study confirmed that the BRH, as a cheap and sustainable material, can be a viable alternative to GAC and MWCNTs for remediation and treatment scenarios, particularly in developing countries.

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