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The use of metal nitrate-modified amorphous nano silica for synthesizing solid amine CO2 adsorbents with resistance to urea linkage formation.

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Title: The use of metal nitrate-modified amorphous nano silica for synthesizing solid amine CO2 adsorbents with resistance to urea linkage formation.
Authors: Li, Kai Min1 (AUTHOR) likaimin16@gmail.com, Lu, Lu1 (AUTHOR), Xu, Yu Rong1 (AUTHOR), Jia, Si Yuan1 (AUTHOR), Zhang, Zhen Qi2 (AUTHOR), Qi, Zhong Bao2 (AUTHOR), Wei, Shu Ya1 (AUTHOR)
Source: International Journal of Greenhouse Gas Control. Mar2021, Vol. 106, pN.PAG-N.PAG. 1p.
Subject Terms: *Sorbents, *Urea, *Carbon dioxide, Metallic glasses, Polyethyleneimine, Silica
Abstract: • A facile method was developed for synthesizing solid amine CO 2 adsorbents with resistance to urea linkage formation. • Metal nitrates-modified-amorphous nano SiO 2 supported polyethyleneimine significantly inhibited urea linkage formation. • The addition of metal nitrates into amorphous nano SiO 2 enhanced the H 2 O binding ability of SiO 2 at 130 °C. The formation of urea linkages is a limitation to the application of solid amine CO 2 adsorbents. Therefore, the development of solid amine adsorbents with resistance to urea linkage formation has attracted much interest over the last 5 years. In this study, we developed a facile method for synthesizing solid amine adsorbents with effective resistance to urea linkage formation. For the first time, metal nitrates were used to modify amorphous nano SiO 2 to support polyethyleneimine (PEI). Three metal nitrates were investigated: aluminum, magnesium, and zinc nitrates. A series of adsorbents were prepared by controlling the mass ratios of metal nitrates and nano SiO 2. After 50 cycles of adsorption–desorption tests, adsorbing at 75 °C under 15 % CO 2 balanced with N 2 and desorbing at 130 °C under pure CO 2 , Al-20%@SiO 2 -PEI, Al-15%@SiO 2 -PEI, Al-10%@SiO 2 -PEI, Zn-10%@SiO 2 -PEI, and Mg-10%@SiO 2 -PEI lost only 2.6 %, 4.0 %, 5.2 %, 15.9 %, and 28.8 % of their original CO 2 adsorption capacities, respectively. However, SiO 2 -PEI, calcined SiO 2 -PEI, and Al-5%@SiO 2 -PEI lost 42.9 %, 48.6 %, and 49.6 %, respectively. By combining the infrared spectra of all the adsorbents through cyclic adsorption–desorption tests, inhibitory effects on urea linkage formation were proven for Al-20%@SiO 2 -PEI, Al-15%@SiO 2 -PEI, Zn-10%@SiO 2 -PEI, and Mg-10%@SiO 2 -PEI, and especially for Al-10%@SiO 2 -PEI. Through a relatively comprehensive analysis, we found that a desirable amount of metal nitrates could modify nano SiO 2 samples and their corresponding adsorbents possessed a stronger H 2 O binding ability at 130 °C. The retained H 2 O could act as an inhibiting agent for the inhibition of urea linkage formation. [ABSTRACT FROM AUTHOR]
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Abstract:• A facile method was developed for synthesizing solid amine CO 2 adsorbents with resistance to urea linkage formation. • Metal nitrates-modified-amorphous nano SiO 2 supported polyethyleneimine significantly inhibited urea linkage formation. • The addition of metal nitrates into amorphous nano SiO 2 enhanced the H 2 O binding ability of SiO 2 at 130 °C. The formation of urea linkages is a limitation to the application of solid amine CO 2 adsorbents. Therefore, the development of solid amine adsorbents with resistance to urea linkage formation has attracted much interest over the last 5 years. In this study, we developed a facile method for synthesizing solid amine adsorbents with effective resistance to urea linkage formation. For the first time, metal nitrates were used to modify amorphous nano SiO 2 to support polyethyleneimine (PEI). Three metal nitrates were investigated: aluminum, magnesium, and zinc nitrates. A series of adsorbents were prepared by controlling the mass ratios of metal nitrates and nano SiO 2. After 50 cycles of adsorption–desorption tests, adsorbing at 75 °C under 15 % CO 2 balanced with N 2 and desorbing at 130 °C under pure CO 2 , Al-20%@SiO 2 -PEI, Al-15%@SiO 2 -PEI, Al-10%@SiO 2 -PEI, Zn-10%@SiO 2 -PEI, and Mg-10%@SiO 2 -PEI lost only 2.6 %, 4.0 %, 5.2 %, 15.9 %, and 28.8 % of their original CO 2 adsorption capacities, respectively. However, SiO 2 -PEI, calcined SiO 2 -PEI, and Al-5%@SiO 2 -PEI lost 42.9 %, 48.6 %, and 49.6 %, respectively. By combining the infrared spectra of all the adsorbents through cyclic adsorption–desorption tests, inhibitory effects on urea linkage formation were proven for Al-20%@SiO 2 -PEI, Al-15%@SiO 2 -PEI, Zn-10%@SiO 2 -PEI, and Mg-10%@SiO 2 -PEI, and especially for Al-10%@SiO 2 -PEI. Through a relatively comprehensive analysis, we found that a desirable amount of metal nitrates could modify nano SiO 2 samples and their corresponding adsorbents possessed a stronger H 2 O binding ability at 130 °C. The retained H 2 O could act as an inhibiting agent for the inhibition of urea linkage formation. [ABSTRACT FROM AUTHOR]
ISSN:17505836
DOI:10.1016/j.ijggc.2021.103289