Sr2+鈥揝APO-34 Prepared via Coupled Partial Detemplation and Solid State Ion Exchange: Effect on Textural Properties and Carbon Dioxide Adsorption

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• 作者：Ana G. Are虂valo-Hidalgo ; Noelia E. Almodo虂var-Arbelo ; Arturo J. Herna虂ndez-Maldonado
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：September 7, 2011
• 年：2011
• 卷：50
• 期：17
• 页码：10259-10269
• 全文大小：1149K
• 年卷期：v.50,no.17(September 7, 2011)
• ISSN：1520-5045

文摘

Sr²⁺鈥揝APO-34 materials were prepared via solid-state ion exchange (SSIE) to improve their CO₂ adsorptive properties, particularly at low partial pressure, and study the effect of the ion exchange treatments on the structural and textural properties of the materials. In the past, these materials have been prepared with traditional liquid-state ion exchange (LSIE) methods yielding a strontium(II) content of about one cation per unit cell, well below the theoretical maximum and probably due to aqueous phase equilibrium constraints. Characterization of the SSIE materials included coupled thermal gravimetric analyses/Fourier transform infrared spectroscopy (TGA/FT-IR), X-ray diffraction (XRD), energy-dispersive analysis by X-rays (EDAX), surface area, and pure component CO₂ equilibrium adsorption. Coupled TGA/FT-IR studies were used for the selection of the SSIE temperature for both NH₄⁺鈥揝APO-34 and as-synthesized Na⁺鈥揝APO-34 starting materials. In general, the results indicated that temperatures well above the Tammann point are necessary to achieve acceptable strontium(II) loadings via SSIE while minimizing the loss of effective surface area due to pore clogging with unexchanged SrCl₂. Furthermore, in situ partial detemplation (PD) of the as-synthesized material during SSIE avoided the formation of excess proton (acid) sites and allowed further loading of strontium(II) onto sites suitable for interaction with CO₂. In order to increase the strontium(II) loading per unit cell, a combined PD/SSIE/LSIE strategy was used to remove some of the remaining tenacious sodium(I) cations remaining after SSIE. This approach resulted in materials with a loading of nearly two strontium cations per unit cell and, as a result, improved the overall CO₂ adsorption performance of the materials in a remarkable fashion.