Modifier-enhanced supercritical CO2 extraction of organic template from aluminosilicate MCM-41 materials: Effect of matrix Al/Si ratios and different modifiers

作者：Huang Zhen^*; Miao Hui; Li Jing huan; Wei Jia lin; Kawi S; Lai M W

来源：Separation and Purification Technology, 2013, 118: 170-178.

DOI：10.1016/j.seppur.2013.06.048

• Supercritical fluid extraction
• Aluminosilicate MCM-41 materials
• Polar modifier
• Si/Al ratio
• Template removal

The introduction of polar modifiers usually can make supercritical CO2 extraction more attractive in various potential applications. In this work, modified SCCO2 extraction has been investigated for removing the template cetyltrimethylammonium bromide (CTMABr) from newly synthesized aluminosilicate MCM-41 materials. The effects of the modifier identity and matrix Al/Si ratio on the extraction efficiency and material structural properties are then investigated in detail through numerous characterization methods. The results shows that the incorporation of aluminum into the MCM-41 framework has led to considerable decrease in the extraction efficiencies and the efficiencies are observed to decrease as the Al/Si molar ratio increases arising from the strong interactions between the template and the Al species incorporated into the matrix. Methanol modifier has resulted in much higher extraction efficiencies in the range of 60-87% depending on the Al/Si molar ratio in the sample matrix. Nitrogen adsorption/desorption and XRD results shows that the modifier identity and matrix Al/Si ratio have strongly influenced the structural properties of resultant mesoporous materials. Friedel-Crafts acylation reaction of 2-methoxynaphthalene has been analyzed through gas chromatography and the results show that the sample treated with SCCO2 extraction modified with acetic methanol is more catalytically active than the directly calcined counterpart.

• 出版日期2013-10-30
• 单位天津商业大学