scholarly journals Kinetics of 1-dodecanethiol Desulfurization by Reactive Adsorbtion on MgO/dolomite

2019 ◽  
Vol 69 (12) ◽  
pp. 3439-3444
Author(s):  
Constantin Sorin Ion ◽  
Mihaela Bombos ◽  
Rami Doukeh ◽  
Gabriel Vasilievici ◽  
Vasile Matei
Keyword(s):  
Magnesium Oxide ◽  
Pore Volume ◽  
Pore Diameter ◽  
Adsorption Process ◽  
Continuous System ◽  
Average Pore ◽  
Reactive Adsorption ◽  
Desulfurization Process ◽  
Increasing Temperature ◽  
Kinetics Of

Desulfurisation of 1-dodecanethiol was performed by adsorption process on MgO adsorbent. The adsorbant was characterized by determining the adsorption isotherms, specific surface area, pore volume and average pore diameter. Adsorption experiments were performed in continuous system at 300-450�C, 5 atm and volume hourly space velocities of 1�2 h-1. Conversion of 1-dodecanetol increases with increasing temperature and decreasing volume hourly space velocities. It was identified the stage determinant of the process and a kinetic study of the desulfurization process was developed by reactive adsorption of 1-dodecanethiol on a magnesium oxide adsorbent.

Fuels Desulphurisation by Adsorbtion on Fe / Bentonite

2017 ◽  
Vol 68 (3) ◽  
pp. 483-486
Author(s):  
Constantin Sorin Ion ◽  
Mihaela Bombos ◽  
Gabriel Vasilievici ◽  
Dorin Bombos
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Pore Diameter ◽  
Adsorption Process ◽  
Continuous System ◽  
Gas Oil ◽  
Average Pore ◽  
Atmospheric Distillation

Desulfurisation of atmospheric distillation gasoline and gas oil was performed by adsorption process on Fe/ bentonite. The adsorbent was characterized by determining the adsorption isotherms, specific surface area, pore volume and average pore diameter. Adsorption experiments of atmospheric distillation gasoline and gas oil were performed in continuous system at 280�320oC, 5 atm and volume hourly space velocities of 1�2 h-1. The efficiency of adsorption on Fe / bentonite was better at desulphurisation of gasoline versus gas oil.

Fuels Desulphurization by Adsorption on Blasting Grit

2017 ◽  
Vol 68 (4) ◽  
pp. 732-736
Author(s):  
Constantin Sorin Ion ◽  
Mihaela Bombos ◽  
Gabriel Vasilievici ◽  
Casen Panaitescu ◽  
Raluca Dragomir
Keyword(s):  
Specific Surface ◽  
Pore Volume ◽  
Catalytic Cracking ◽  
Pore Diameter ◽  
Continuous System ◽  
Gas Oil ◽  
Average Pore ◽  
Reactive Adsorption ◽  
Synthetic Reaction ◽  
Cracking Gas

Desulphurization by reactive adsorption was studied on sand abrasive blasting grit/ bentonite. The adsorbent was characterized by determining the composition, adsorption isotherms, specific surface area, pore volume and average pore diameter. Adsorption experiments were performed in continuous system at 260�300oC, 25 atm and volume hourly space velocities of 1-2 h-1. The efficiency of adsorption was evaluated at desulphurization of a synthetic reaction mixture and a catalytic cracking gas oil.

scholarly journals Study on Crack Development and Micro-Pore Mechanism of Expansive Soil Improved by Coal Gangue under Drying–Wetting Cycles

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6546
Author(s):  
Hongxing Zhu ◽  
Yan Zhang ◽  
Zhuhan Li ◽  
Xiaoyu Xue
Keyword(s):  
Soil Sample ◽  
Pore Volume ◽  
Pore Diameter ◽  
Expansive Soil ◽  
Soil Samples ◽  
Coal Gangue ◽  
Pore Density ◽  
Pore Characteristics ◽  
Average Pore ◽  
Road Engineering

Expansive soil is prone to cracks under a drying–wetting cycle environment, which brings many disasters to road engineering. The main purpose of this study is use coal gangue powder to improve expansive soil, in order to reduce its cracks and further explore its micro-pore mechanism. The drying–wetting cycles test is carried out on the soil sample, and the crack parameters of the soil sample are obtained by Matlab and Image J software. The roughness and micro-pore characteristics of the soil samples are revealed by means of the Laser confocal 3D microscope and Mercury intrusion meter. The results show that coal gangue powder reduces the crack area ratio of expansive soil by 48.9%, and the crack initiation time is delayed by at least 60 min. Coal gangue powder can increase the internal roughness of expansive soil. The greater the roughness of the soil, the less cracks in the soil. After six drying–wetting cycles, the porosity and average pore diameter of the improved and expanded soil are reduced by 37% and 30%, respectively, as compared to the plain expansive soil. By analyzing the cumulative pore volume and cumulative pore density parameters of soil samples, it is found that the macro-cracks are caused by the continuous connection and fusion of micro-voids in soil. Coal gangue powder can significantly reduce the proportion of micro-voids, cumulative pore volume, and cumulative pore density in expansive soil, so as to reduce the macro-cracks.

Adsorption of sunset yellow FCF from aqueous solution by chitosan-modified diatomite

2015 ◽  
Vol 72 (10) ◽  
pp. 1861-1868 ◽  
Author(s):  
Y. Z. Zhang ◽  
J. Li ◽  
W. J. Li ◽  
Y. Li
Keyword(s):  
Contact Time ◽  
Pore Diameter ◽  
Adsorption Process ◽  
Dye Adsorption ◽  
Sunset Yellow ◽  
Experimental Conditions ◽  
Average Pore ◽  
Experimental Values ◽  
Adsorption Desorption ◽  
Optimized Conditions

Sunset yellow (SY) FCF is a hazardous azo dye pollutant found in food processing effluent. This study investigates the use of diatomaceous earth with chitosan (DE@C) as a modified adsorbent for the removal of SY from wastewater. Fourier transform infrared spectroscopy results indicate the importance of functional groups during the adsorption of SY. The obtained N2 adsorption–desorption isotherm values accord well with IUPAC type II. Our calculations determined a surface area of 69.68 m2 g−1 for DE@C and an average pore diameter of 4.85 nm. Using response surface methodology, optimized conditions of process variables for dye adsorption were achieved. For the adsorption of SY onto DE@C, this study establishes mathematical models for the optimization of pH, contact time and initial dye concentration. Contact time plays a greater role in the adsorption process than either pH or initial dye concentration. According to the adjusted correlation coefficient (adj-R2 > 0.97), the models used here are suitable for illustration of the adsorption process. Theoretical experimental conditions included a pH of 2.40, initial dye concentration of 113 mg L−1 and 30.37 minutes of contact time. Experimental values for the adsorption rate (92.54%) were close to the values predicted by the models (95.29%).

Surfactant-Templated Synthesis of Modified Porous Clay Heterostructure (PCH)

2008 ◽  
Vol 55-57 ◽  
pp. 317-320 ◽  
Author(s):  
K. Srithammaraj ◽  
Rathanawan Magaraphan ◽  
H. Manuspiya
Keyword(s):  
Pore Volume ◽  
Pore Diameter ◽  
Condensation Reaction ◽  
High Surface ◽  
High Surface Area ◽  
Bentonite Clay ◽  
Directed Assembly ◽  
Average Pore Diameter ◽  
Average Pore ◽  
Surface Areas

Porous Clay Heterostructures (PCHs) have been prepared by the surfactant-directed assembly of mesostructured silica within the two-dimensional interlayer galleries of clays. The PCH is an interesting material to use as entrapping system such as ethylene scavenger, owing to its high surface area with uniform and specific pore size. In the present work, the PCH was synthesized within the galleries of Na-bentonite clay by the polymerization of tetraethoxysilane (TEOS) in the presence of surfactant micelles. In addition, a mesoporous clay with organic-inorganic hybrid (HPCH) is modified via co-condensation reaction of TEOS with methyltriethoxysilane (MTS) to enhance hydrophobicity of PCH material for entrapping system. According to pore characterization, PCHs have surface areas of 421-551 m2/g, an average pore diameter in the supermicropore to small mesopore range of 4.79-5.02 nm, and a pore volume of 0.57-0.66 cc/g while HPCHs have surface areas of 533-966 m2/g, an average pore diameter of 4.28-6.38 nm, and a pore volume of 0.42-0.77cc/g.

Experimental Research on the Preparation of Porous Activated Carbon from Orange Wastes

2009 ◽  
Vol 79-82 ◽  
pp. 1907-1910
Author(s):  
Zhi Gang Xie
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Pore Volume ◽  
Pore Diameter ◽  
Total Pore Volume ◽  
Carbonization Temperature ◽  
Bet Surface Area ◽  
Average Pore ◽  
Impregnation Ratio ◽  
Heat Preservation

Porous activated carbon was prepared from orange wastes using zinc chloride as an activating agent by one-step carbonization method. Effects of impregnation ratio, carbonization temperature and heat preservation time on pore characteristics of activated carbon were studied. The porous structures of the orange wastes activated carbon were investigated by BET, D-R equations, BJH equations and Kelvin theory. The morphology was observed using transmission electron microscopy (TEM). The mesoporous activated carbon is gained when the impregnation ratio is 3:1; the carbonization temperature is 550°Cand heat preservation time is 1.0 h. The activated carbon has total pore volume 2.098 cm3/g, mesoporous pore volume 1.438 cm3/g, with a high BET surface area 1476m2/g. The pore distribution of the mesoporous activated carbon is very concentrative, with average pore diameter of 3.88nm. While, the high specific surface area activated carbon is gained when the impregnation ratio is 2:1; the carbonization temperature is 550°Cand heat preservation time is 1.0 h. The activated carbon has high BET surface area 1909 m2/g, while the total pore volume is only 1.448cm3/g and microporous pore volume is 0.889cm3/g, with average pore diameter of 2.29 nm.

scholarly journals Possibilities of Graphitization of Unburned Carbon from Coal Fly Ash

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1027
Author(s):  
Zdzisław Adamczyk ◽  
Joanna Komorek ◽  
Barbara Białecka ◽  
Joanna Całus-Moszko ◽  
Agnieszka Klupa
Keyword(s):  
Fly Ash ◽  
Pore Volume ◽  
Pore Diameter ◽  
Coal Fly Ash ◽  
Total Pore Volume ◽  
Starting Material ◽  
Unburned Carbon ◽  
Active Carbons ◽  
Average Pore ◽  
Graphite Phase

The paper presents the characteristics of products annealing at the temperatures of 2400 and 3000 °C of unburned carbon from coal fly ash in terms of its possible use as a starting material in the graphitization process. An amorphous substance (organic substance) with an admixture of some minerals has been found in samples subjected to graphitization. However, the graphite phase is dominant in products subjected to graphitization. Studies have also shown a diverse grain morphology in individual samples. The presence of plate-shaped and tube-shaped grains was found. As the graphitization temperature of the starting material increases (2400 and 3000 °C), the specific surface area in the graphitization products decreases. The total pore volume in the samples after the graphitization process was significantly lower than the pore volume of active carbons produced from other unburned carbon. Average pore diameter is similar to the pore diameter in active carbons. The reflectance value of the matrix for the sample graphitized at 3000 °C is characteristic for graphite. Unburned carbon from Polish fly ash can be used as the starting material for graphitization.

Hydrodesulphurization of Thiophenes over CoMoRe/ ZSM 5gama-Al2O3 Catalyst

2018 ◽  
Vol 69 (6) ◽  
pp. 1386-1390
Author(s):  
Rami Doukeh ◽  
Mihaela Bombos ◽  
Marioara Moldovan ◽  
Ion Bolocan
Keyword(s):  
Pore Volume ◽  
Pore Diameter ◽  
Fixed Bed ◽  
Texture Features ◽  
Molar Ratio ◽  
Catalytic Reactor ◽  
Average Pore ◽  
Metallic Catalyst ◽  
C 30 ◽  
Al2o3 Catalyst

The hydrodesulphurization (HDS) of thiophenes was performed on metallic catalyst CoMoRe/ZSM5-gAl2O3. Experiments were carried out on a fixed bed catalytic reactor at 175-300�C, 30-60 atm, thiophene volume hourly space velocities of 1h-1- 4h-1 and molar ratio hydrogen/thiophene of 60/1. Texture features like specific surface area, the pore volume and the average pore diameter decrease after catalyst sulfurization. The thiophenes conversion on CoMoRe/gAl2O3-Zn-HZSM 5 catalyst differs with the nature of the studied thiophenes.

scholarly journals Temperature Effects Associated with the Adsorption of Neodymium Ions onto Activated Charcoal

2005 ◽  
Vol 23 (5) ◽  
pp. 399-406 ◽  
Author(s):  
Riaz Qadeer
Keyword(s):  
Activation Energy ◽  
Activated Charcoal ◽  
Temperature Effects ◽  
Adsorption Process ◽  
First Order ◽  
First Order Kinetics ◽  
Charcoal Adsorption ◽  
Increasing Temperature ◽  
Kinetics Of ◽  
Activated Charcoal Adsorption

The temperature dependence of the kinetics of the adsorption of neodymium ions from aqueous solution onto activated charcoal has been studied. The results obtained indicate that a form of equilibration appears to be attained after ca. 30 min although further very slow changes may occur over a much longer period. The adsorption process is controlled by the diffusion of neodymium ions into the pores of the activated charcoal. Adsorption follows first-order kinetics with an activation energy of 13.09 kJ/mol. Values of the equilibrium constant for the adsorption of neodymium ions onto activated charcoal increase with increasing temperature, thereby indicate the endothermic nature of the process.

scholarly journals Effects of AKD Sizing on the Morphology and Pore Distribution Properties of OCC Fibers

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Hua Chen ◽  
Jing Yang ◽  
Zhijun Hu ◽  
Bingbing Zheng ◽  
Jun Sun ◽  
...  
Keyword(s):  
Pore Volume ◽  
Pore Diameter ◽  
Control Sample ◽  
Bet Surface Area ◽  
Alkyl Ketene Dimer ◽  
Average Pore ◽  
Force Microscopy ◽  
Atomic Force ◽  
Dispersed Particles ◽  
Scanning Electron

Changes of the morphology and pore structure of old corrugated container (OCC) fibers during an alkyl ketene dimer (AKD) sizing process were studied. The resulting samples were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle, and BET surface area analysis. The length of fibers had obvious influence on the AKD sizing effect, and the length of fibers ranged from 100 to 200 meshes showed the best sizing performance. The surface roughness of 0.3% AKD sizing OCC fibers decreased from 27.949 nm to 12.811 nm. Compared with the control sample, the pore volume of fibers sized with 0.1% AKD decreased 4.3% when the average pore diameter was fixed at 2.4~3.0 nm. And when the usage of AKD increased to 0.3% and 0.5%, the pore volume decreased 1.4% and 6.3% accordingly. The decrease in the pore volume of AKD-sized fiber indicated the penetration and deposition of dispersed particles of AKD in the fiber lumens.

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