Carbon dioxide and hydrogen adsorption study on surface-modified HKUST-1 with diamine/triamine

Abstract

The present article intended to study the influence of post-synthetic modification with ethylenediamine (en, diamine) and diethylenetriamine (deta, triamine) within the coordinatively unsaturated sites (CUSs) of HKUST-1 on carbon dioxide and hydrogen storage. The as-sythesized adsorbent was solvent-exchanged and subsequently post-synthetically modified with di-/triamines as sources of amine-based sorption sites due to the increased CO2 storage capacity. It is known that carbon dioxide molecules have a high affinity for amine groups, and moreover, the volume of amine molecules itself reduces the free pore volume in HKUST-1, which is the driving force for increasing the hydrogen storage capacity. Different concentrations of amines were used for modification of HKUST-1, through which materials with different molar ratios of HKUST-1 to amine: 1:0.05; 1:0.1; 1:0.25; 1:0.5; 1:0.75; 1:1; 1:1.5 were synthesized. Adsorption measurements of carbon dioxide at 0 °C up to 1 bar have shown that the compounds can adsorb large amounts of carbon dioxide. In general, deta-modified samples showed higher adsorbed amounts of CO2 compared to en-modified materials, which can be explained by the higher number of amine groups within the deta molecule. With an increasing molar ratio of amines, there was a decrease in wt.% CO2. The maximum storage capacity of CO2 was 22.3 wt.% for HKUST-1: en/1:0.1 and 33.1 wt.% for HKUST-1: deta/1:0.05 at 0 °C and 1 bar. Hydrogen adsorption measurements showed the same trend as carbon dioxide, with the maximum H2 adsorbed amounts being 1.82 wt.% for HKUST-1: en/1:0.1 and 2.28 wt.% for HKUST-1: deta/1:0.05 at − 196 °C and 1 bar.

Cellulose–Amine Porous Materials: The Effect of Activation Method on Structure, Textural Properties, CO2 Capture, and Recyclability

“…Despite lower values of specific surface area and pore volume, the hydrothermal products displayed higher adsorption capacity, which suggests a nonlinear relationship between BET surface area and adsorption capacity for the prepared biomass-based activated carbons. The high CO 2 uptake of the hydrothermal products can be attributed to their high amine (nitrogen) content, as indicated by CHN/O analysis (see Table 1 ), which serve as the main adsorption sites for CO 2 molecules [ 56 , 57 ]. The highest adsorption capacity of 32.3 wt.…”

“…The high CO2 uptake of the hydrothermal products can be attributed to their high amine (nitrogen) content, as indicated by CHN/O analysis (see Table 1), which serve as the main adsorption sites for CO2 molecules [56,57]. The highest adsorption capacity of 32.3 wt.…”

Mechanochemical Synthesis of MOF-303 and Its CO2 Adsorption at Ambient Conditions

“…CuBTC is a well-known MOF with a very high CO 2 adsorption capacity of up to 8–9 mmol/g at 0 °C and under 1 bar [ 67 , 68 , 69 ], and thus, it was selected for comparison. CuBTC MOFs prepared in this work, i.e., CuBTC_B and CuBTC_L, show comparable CO 2 adsorption capacities of 4.9 mmol/g and 5.5 mmol/g at 25 °C and under 1 bar and 9.1 mmol/g and 9.6 mmol/g at 0 °C and under 1 bar, respectively.…”

Mechanistic insights into the co-recovery of nickel and iron via integrated carbon mineralization of serpentinized peridotite by harnessing organic ligands

“…Also, Na 2 H 2 EDTA·2H 2 O, containing a diamine group, possesses a strong affinity towards CO 2 , thereby facilitating CO 2 hydration. 77,78 Primary diamines, like ethylenediamine, exhibit high CO 2 adsorption capacity compared to other amines and CO 2 can be bound as bicarbonate, carbonate, carbamate or dicarbamate during chemical adsorption of CO 2 in aqueous diamine systems. 79 In this study, an optimum Na 2 H 2 EDTA·2H 2 O dosage of Na 2 H 2 EDTA·2H 2 O/TNi = 2 and 2 M NaHCO 3 were maintained throughout all experimental conditions.…”