Amine-Functionalized Titania-based Porous Structures for Carbon Dioxide Postcombustion Capture

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• 作者：Cindy C. Aquino ; Gilles Richner ; Maryline Chee Kimling ; Dehong Chen ; Graeme Puxty ; Paul H. M. Feron ; Rachel A. Caruso
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 16, 2013
• 年：2013
• 卷：117
• 期：19
• 页码：9747-9757
• 全文大小：517K
• 年卷期：v.117,no.19(May 16, 2013)
• ISSN：1932-7455

文摘

An amine-grafted solid sorbent is a promising alternative to aqueous amine scrubbing for removing CO₂ from the flue gas of coal power plants. In this study, phosphonic and carboxylic acids have been investigated as alternative anchor groups to trimethoxysilanes to synthesize amine-functionalized TiO₂-based sorbents. Several supports, namely, mesoporous TiO₂ beads, TiO₂ nanoparticles (Degussa P25), and TiO₂/ZrO₂ composite beads, and a range of amines (1, 2, and 3 carbon-chain primary amine) have been assessed for CO₂ adsorption at 30 掳C and up to 101 kPa CO₂. As a general trend, CO₂ adsorption capacity increased with the carbon-chain length of the amine. Finally, materials functionalized with amino acids, l-glutamine or l-arginine, were investigated; the latter showed the highest CO₂ adsorption capacity (0.4 mmol/g at 30 掳C and 20 kPa CO₂) due to the higher pK_a (12.10) of one of the amino groups.