Amine-oxide hybrid materials for acid gas separations

Solid Adsorbents for Low-Temperature CO2 Capture with Low-Energy Penalties Leading to More Effective Integrated Solutions for Power Generation and Industrial Processes

“…It should be noted that when taking the surface characteristics of the immobilized amine adsorbents into consideration, the adsorption mechanism becomes more complicated. For example, amine groups may react with the surface silanol groups leading to amine efficiency lower than expected, and some of the initially formed carbamic acid may remain unchanged due to the lack of amine groups at close vicinity (Knofel et al, 2009;Bollini et al, 2011). Even in the presence of H 2 O, the formation of carbamates is kinetically favored over bicarbonate although the latter is more stable.…”

“…According to Jones et al, the immobilized amine adsorbents can be classified into three categories Bollini et al, 2011), namely (i) those prepared from physical deposition/combination of pre-synthesized amines onto SiO 2 (Class 1), (ii) those materials with covalent bonds between the amines and the SiO 2 support (Class 2), and (iii) those prepared by the in situ polymerization of reactive amine monomers on and in the silica support. Figure 7 reproduced from Bollini et al (2011) illustrates the difference between these materials, and this section will be organized according to this classification, key parameters for immobilized amine adsorbents can be found in Tables 2-4.…”

“…The greatest challenge for adsorption is the development of appropriate materials that can be effectively used under processing conditions Bollini et al, 2011;Jones, 2011;Sayari et al, 2011; Wang et al, 2011a,b). In many papers, adsorption capacity is the only criterion used to evaluate adsorbents, for practical CO 2 capture applications however, there are more requirements.…”

“…Furthermore, when amine scrubbing is applied, the overall energy penalty at power plants reduces efficiency typically by 10%, representing a reduction in electricity generation of 25% for a modern supercritical coal power plant. On the other hand, some emerging technologies, such as membranes, are still in their infancy, therefore, more energy-efficient processes Recent advances on the development of CO 2 adsorbents are needed to be developed for CO 2 capture, where adsorption is one such alternative Wang et al, 2011a).The greatest challenge for adsorption is the development of appropriate materials that can be effectively used under processing conditions Bollini et al, 2011;Jones, 2011;Sayari et al, 2011; Wang et al, 2011a,b). In many papers, adsorption capacity is the only criterion used to evaluate adsorbents, for practical CO 2 capture applications however, there are more requirements.…”

The concept of thin film bulk acoustic resonators as selective CO<sub>2</sub> gas sensors

“…For CO 2 the choice of a sensitive, gas selective, and stable material is especially difficult, as CO 2 is a rather inert gas and in its size and polarity similar to other atmospheric gases, such as H 2 O, SO 2 , and NO x . Amino groups (-NH x ) are well known to interact with CO 2 at room temperature, which is why they are extensively used in industrial CO 2 capture processes (Bollini et al, 2011). Moreover, amino groups bound in the form of amino-polysiloxanes have the ability to be easily deposited as thin solid layers.…”