Pore Size Engineering on MCM-41: Selectivity Tuning of Heterogenized AlCl3 for the Synthesis of Linear Alkyl Benzenes

2000 ◽  
Vol 195 (2) ◽  
pp. 412-415 ◽  
Author(s):  
Xucan Hu ◽  
Maw Lin Foo ◽  
Gaik Khuan Chuah ◽  
Stephan Jaenicke
Keyword(s):  
Pore Size ◽  
Linear Alkyl Benzenes ◽  
Alkyl Benzenes ◽  
Mcm 41

scholarly journals Coal Fly Ash Derived Silica Nanomaterial for MMMs—Application in CO2/CH4 Separation

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 78
Author(s):  
Marius Gheorghe Miricioiu ◽  
Violeta-Carolina Niculescu ◽  
Constantin Filote ◽  
Maria Simona Raboaca ◽  
Gheorghe Nechifor
Keyword(s):  
Fly Ash ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Coal Fly Ash ◽  
High Surface ◽  
Industrial Applications ◽  
Mixed Matrix Membranes ◽  
Co2 Removal ◽  
Mcm 41

In order to obtained high selective membrane for industrial applications (such as natural gas purification), mixed matrix membranes (MMMs) were developed based on polysulfone as matrix and MCM-41-type silica material (obtained from coal fly ash) as filler. As a consequence, various quantities of filler were used to determine the membranes efficiency on CO2/CH4 separation. The coal fly ash derived silica nanomaterial and the membranes were characterized in terms of thermal stability, homogeneity, and pore size distribution. There were observed similar properties of the obtained nanomaterial with a typical MCM-41 (obtained from commercial silicates), such as high surface area and pore size distribution. The permeability tests highlighted that the synthesized membranes can be applicable for CO2 removal from CH4, due to unnoticeable differences between real and ideal selectivity. Additionally, the membranes showed high resistance to CO2 plasticization, due to permeability decrease even at high feed pressure, up to 16 bar.

Positronium Thermalization Process in Nanoporous Materials and its Influence on the Shape of PALS Spectrum

2008 ◽  
Vol 607 ◽  
pp. 39-41
Author(s):  
Jerzy Kansy ◽  
Radosław Zaleski
Keyword(s):  
Mesoporous Silica ◽  
Pore Size Distribution ◽  
Porous Materials ◽  
Pore Size ◽  
Size Distribution ◽  
Nanoporous Materials ◽  
New Method ◽  
New Model ◽  
Conventional Models ◽  
Mcm 41

A new method of analysis of PALS spectra of porous materials is proposed. The model considers both the thermalization process of positronium inside the pores and the pore size distribution. The new model is fitted to spectra of mesoporous silica MCM-41 and MSF. The resulting parameters are compared with parameters obtained from fitting the “conventional” models, i.e. a sum of exponential components with discrete or/and distributed lifetimes.

Influence of Atmospheric Gases Present in the Pores of MCM-41 on Lifetime of Ortho-Positronium

2010 ◽  
Vol 666 ◽  
pp. 123-128 ◽  
Author(s):  
Radosław Zaleski ◽  
Michał Sokół
Keyword(s):  
Porous Material ◽  
Pore Size ◽  
Reasonable Agreement ◽  
Size Distributions ◽  
Spectroscopy Data ◽  
Atmospheric Gases ◽  
Positron Annihilation Lifetime ◽  
Pore Size Distributions ◽  
Mcm 41 ◽  
Quenching By Oxygen

The modification of the extended Tao-Eldrup model accounting ortho-positronium quenching in air is presented. Taking into account quenching by oxygen molecules adsorbed on the surface of porous material gives reasonable agreement between results of the model and the experimental positron annihilation lifetime spectroscopy data. Pore size distributions calculated using this model from the spectra for MCM 41 mesoporous sieve obtained in air, oxygen or vacuum are compared and discussed taking into account effect of ortho-positronium migration from small open pores to the larger ones. The rates of ortho-positronium quenching by air (47.2 µs-1 MPa 1), oxygen (220 µs-1 MPa-1) or nitrogen (1.7 µs-1 MPa-1) obtained from pressure dependences of the lifetimes observed in MCM 41 agree reasonably with the experimental results of other authors, if the correction for oxygen adsorbed on the surface is applied.

Pore Size Analysis of MCM-41 Type Adsorbents by Means of Nitrogen and Argon Adsorption

1998 ◽  
Vol 207 (1) ◽  
pp. 159-169 ◽  
Author(s):  
Alexander V. Neimark ◽  
Peter I. Ravikovitch ◽  
Michael Grün ◽  
Ferdi Schüth ◽  
Klaus K. Unger
Keyword(s):  
Pore Size ◽  
Size Analysis ◽  
Pore Size Analysis ◽  
Argon Adsorption ◽  
Mcm 41

The influence of synthesis parameters on the vanadium content and pore size of [V]-MCM-41 materials

1999 ◽  
Vol 28 (3) ◽  
pp. 353-360 ◽  
Author(s):  
Alexa B.J Arnold ◽  
John P.M Niederer ◽  
Thomas E.W Nießen ◽  
Wolfgang F Hölderich
Keyword(s):  
Pore Size ◽  
Vanadium Content ◽  
Synthesis Parameters ◽  
Mcm 41

Influence of ion exchange and calcination on pore size and thermal stability of MCM-41 with different Si/Al ratios

1998 ◽  
Vol 94 (6) ◽  
pp. 817-820 ◽  
Author(s):  
Heico Koch ◽  
Uwe Böhmer ◽  
Andreas Klemt ◽  
Wladimir Reschetilowski ◽  
Michael Stöcker
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Pore Size ◽  
Thermal Stability Of ◽  
Mcm 41
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