Limestone Characterization to Model Damage from Acidic Precipitation:  Effect of Pore Structure on Mass Transfer

1996 ◽  
Vol 30 (7) ◽  
pp. 2202-2210 ◽  
Author(s):  
Steve D. Leith ◽  
Michael M. Reddy ◽  
W. Fred Ramirez ◽  
Michael J. Heymans
Keyword(s):  
Mass Transfer ◽  
Pore Structure ◽  
Acidic Precipitation ◽  
Precipitation Effect

Role of mesopores in Co/ZSM-5 for the direct synthesis of liquid fuel by Fischer–Tropsch synthesis

2018 ◽  
Vol 8 (24) ◽  
pp. 6346-6359 ◽  
Author(s):  
Ji-Eun Min ◽  
Sungtak Kim ◽  
Geunjae Kwak ◽  
Yong Tae Kim ◽  
Seung Ju Han ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Pore Structure ◽  
Liquid Fuel ◽  
Direct Synthesis ◽  
Reaction System ◽  
Complex Reaction ◽  
Fischer Tropsch ◽  
Solid Catalysts ◽  
The Impact

In a complex reaction system, in which gas, liquid, and solid catalysts work together, understanding the impact of mass transfer that varies with the catalyst pore structure is very challenging but also essential to designing selective catalysts.

Insights into the formation, structural properties and performance of RAFT polymerized l-phenylalanine anilide molecularly imprinted polymers

2015 ◽  
Vol 6 (41) ◽  
pp. 7320-7332 ◽  
Author(s):  
Mahadeo R. Halhalli ◽  
Börje Sellergren
Keyword(s):  
Mass Transfer ◽  
Pore Structure ◽  
Radical Polymerization ◽  
Molecularly Imprinted Polymers ◽  
Controlled Radical Polymerization ◽  
Structure Parameters ◽  
Molecularly Imprinted ◽  
Imprinted Polymers ◽  
And Performance ◽  
Transfer Properties

The enhanced performance of molecularly imprinted polymers prepared by controlled radical polymerization in terms of affinity, selectivity, capacity and mass transfer properties is shown here to correlate with pore structure parameters in their dry and swollen states.

scholarly journals Modeling of Forced Flow-thermal Gradient CVI: Effects of Control Parameters and Processing Schemes on a Densification

2020 ◽  
Author(s):  
Pengfei WANG ◽  
Shengfeng Luo ◽  
Hui ZHANG ◽  
Song ZHANG ◽  
Lili ZHENG
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Pore Structure ◽  
Temperature Control ◽  
Thermal Gradient ◽  
Forced Flow ◽  
Structure Evolution ◽  
Control Parameters ◽  
Porosity Distribution ◽  
Channel Temperature

Abstract A two-channel temperature-control infiltration reactor aiming at fabricating thicker and more uniform composites was designed. Unsteady numerical simulations containing hydrodynamics, mass transfer, heat transfer and pore structure evolution were carried out. By analyzing the effects of concentration, velocity and temperature on the porosity distribution, different densification schemes were proposed and compared. Results show that a preform of thickness 0.04 m and initial porosity 0.8 can be densified to a uniform and compact one with the maximum porosity of 0.1 within 300 hours through the three-step densification scheme. This scheme not only assures a low and uniform porosity over the whole preform but also avoids the huge pumping pressure which may cause the preform cracking.

Suppression of decarbonization and resource characteristics of carbonated spinel-corundum refractories in steel-ladle lining

2021 ◽  
pp. 104-112
Author(s):  
S. A. Suvorov ◽  
A. P. Shevchik ◽  
V. V. Kozlov ◽  
N. V. Arbuzova
Keyword(s):  
Mass Transfer ◽  
Pore Structure ◽  
Experimental Studies ◽  
Ladle Lining ◽  
Steel Ladle ◽  
Functional Zones ◽  
Slag Melt ◽  
Technical Properties ◽  
Resource Characteristics ◽  
Hot Surface

Experimental studies of changes in the pore structure and physical and technical properties of carbonated spinel-corundum refractories under different conditions of decarbonization and the formation of a protective regulatory layer on their hot surface, suppressing decarbonization of the refractory material and mass transfer between the lining and the flow of slag melt, are presented. The results of industrial tests of carbonated spinel-corundum refractories in the working layer of the lining of a 400-ton steel-ladle lining, as well as the topography and consumption specific coefficients of refractories for the functional zones of the ladle lining, the amount of refractory destruction products of the lining during its operation are considered.

Pore Size Distribution Effect on the Mass Transfer and Reaction in a Cylindrical Porous Gas Sensitive Medium

2012 ◽  
Vol 550-553 ◽  
pp. 2972-2976
Author(s):  
Ming Chun Li ◽  
Chen Wang ◽  
Jia Tao Liu ◽  
Yu Jing
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Pore Structure ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Chemical Reaction ◽  
Mass Transfer Rate ◽  
Gas Sensitivity ◽  
Effective Utilization

Based on the pore size distribution simulation and the derivation of the effective diffusion coefficient, a mathematical model describing the mass transfer and chemical reaction in a cylindrical gas sensitive porous medium is formulated. The reaction features and the effective utilization of the gas sensitive porous medium are analyzed under different pore size distribution. The results indicate that, an increase in porosity or in the most probably pore diameter leads to a higher mass transfer rate of the target gas, while the surface chemical reaction ability decreases. Depending on the calculated value of the Thiele number, the variation of the gas sensitivity and the effective surface utilization can be analyzed. The gas sensitivity and the effective utilization coefficient of the gas sensitive porous medium can be controlled by adjusting pore structure parameters. This will be useful for the pore structure design of gas sensor and choosing the most reasonable operation conditions.

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