title   
  

Microwave assisted synthesis of MCM-41 and diffusion of organic solvents in porous media

Nalbant, Aslı and Yürüm, Yuda (2006) Microwave assisted synthesis of MCM-41 and diffusion of organic solvents in porous media. In: 232nd American Chemical Society National Meeting, San Fransisco, USA

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Abstract

Microwave assisted synthesis of mesoporous molecular sieves is a promising method due to several advantageous over conventional hydrothermal method such as more uniform heating, homogeneous nucleation and shorter crystallization times. The effect of microwave power and synthesis time on the structure of MCM-41 were discussed using XRD, N2 physisorption, SEM, TEM techniques. The optimum reaction time and microwave power was determined after the trial of several combinations. The obtained products were compared with the ones synthesized by hydrothermal method. MCM-41 obtained from microwave assisted synthesis was used in the diffusion experiments of organic solvents. The diffusion coefficients, mode of transport and activation energies of organic solvents into the porous channels of MCM-41 were investigated in 24-28 ˚C temperature range. As the molecular weight of the organic solvents increased, diffusion coefficients decreased, the activation energy for diffusion increased, and the time necessary to reach equilibrium was increased.

Item Type:Papers in Conference Proceedings
Subjects:Q Science > QC Physics
ID Code:1245
Deposited By:Yuda Yürüm
Deposited On:07 Dec 2006 02:00
Last Modified:07 Dec 2010 09:35

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