N-doped mesoporous alumina for adsorption of carbon dioxide

Piperazine‐modified activated alumina as a novel promising candidate for CO2 capture: experimental and modeling

“…It was observed that the adsorption capacities were 29.4, and 7.45 mg/g at 55°C for synthesized mesoporous alumina and commercial mesoporous alumina, respectively. The adsorption capacity was increased because of increasing surface area and porosity due to the presence of nitrogen in alumina . In 2013, Auta and Hameed studied adsorption of CO 2 from a CO 2 /N 2 mixture in a fixed bed column at 35°C using modified activated alumina with sodium hydroxide (NaOH).…”

“…Although there are chemical and physical sites on the surface of activated alumina that are attractive to CO 2 molecules, few studies have been conducted on the use of alumina and modified alumina for CO 2 capture. 24,25 In 2011, Thote et al 26 synthesized N-doped mesoporous alumina by chitosan for adsorption of CO 2 from a simulated gas stream containing 15% CO 2 balanced with nitrogen. It was observed that the adsorption capacities were 29.4, and 7.45 mg/g at 55°C for synthesized mesoporous alumina and commercial mesoporous alumina, respectively.…”

“…The adsorption capacity was increased because of increasing surface area and porosity due to the presence of nitrogen in alumina. 26 In 2013, Auta and Hameed 19 studied adsorption of CO 2 from a CO 2 /N 2 mixture in a fixed bed column at 35°C using modified activated alumina with sodium hydroxide (NaOH). The adsorption capacity of unmodified activated alumina was 19.61 mg/g, whereas for modified activated alumina it was 51.92 mg/g.…”

Kinetics of CO2 Adsorption/Desorption of Polyethyleneimine‐Mesoporous Silica

“…Various other adsorbents such as zeolites , , activated carbons , activated aluminas , , and membranes have also been investigated. Zeolite‐based sorbents showed high adsorption capacity at lower temperatures, but their capacity declines above room temperature , . In addition, since these sorbents also absorb moisture and other gases, the CO 2 selectivity is low, which results in large separation systems with high operational cost in practical applications.…”

Thermodynamics of CO2 Adsorption on Polyethyleneimine Mesoporous Silica and Activated Carbon

“…Furthermore, when high molecular weight polyethyleneimine (PEI) is employed the volatilization and/or decomposition are expected to be minimal because of the relatively high melting temperature of such a high molecular weight material. Many other solid sorbents, e.g., activated carbons [21][22][23][24], zeolites [25,26], activated alumina [27][28][29], and membranes [30] have also been tested. Activated carbon showed great sorption capacity, however limited to use at lower temperatures and high pressures [31,32].…”