In recent years, hydrogen energy and carbon capture and utilization-related industries have received extensive attention and development, especially hydrogen storage and CO2 capture and conversion and utilization-related industries. The research of H2, CO2, and other gas storage and separation materials is the key to promoting the development of related industries.
Recently, Prof. Cheng Xingxing's group at Shandong University synthesized biomass cellulose carbon aerogel with a three-dimensional network structure from Tetragonum officinale (TO) and further enhanced the energy storage performance of the carbon aerogel with KOH activation.TO cellulose carbon aerogel is characterized by its lightweight (3.65 mg/cm3), superhydrophobicity, and large specific surface area (1840 cm2/g). Due to the excellent microporous volume and abundant functional groups, TO carbon aerogel can be used as a multifunctional adsorbent material in different applications. The material possesses 0.6 wt% hydrogen storage capacity, 16 mmol/g CO2 adsorption capacity, 123.31 mg/g o-xylene, and 124.57 mg/g o-dichlorobenzene adsorption capacity at room temperature. The low-cost, environmentally friendly, and multifunctional TO cellulose carbon aerogels are promising for various applications such as hydrogen storage, carbon sequestration, and dioxin removal. The study provides a new and effective approach for the sustainable design and fabrication of high-performance functional carbon materials from renewable biomass resources, which can be widely used in energy storage and environmental protection industries. The study is entitled "Multifunctional carbon aerogels from typha orientalis for applications in adsorption: Hydrogen storage, CO2 capture, and VOCs removal". Removal" was published in the journal Energy.
The CIQTEK EASY-V product line was used in the study.
Schematic illustration for the fabrication procedure of TO cellulose carbon aerogels.
In addition, in the direction of gas separation materials research, Prof. Ren Xiuxiu's group at Changzhou University successfully prepared composite membranes for H2 separation by doping two-dimensional (2D) molybdenum disulfide (MoS2), which is unique to H2, into grafted microporous organosilica networks derived from 1,2-bis(triethoxysilyl)ethane (BTESE) using the sol-gel method. The research results were published in the journal Industrial & Engineering Chemistry Research under the title "Laminar MoS2 Nanosheets Embedded into Organosilica Membranes for Efficient H2 Separation. Due to their opposite ζ-potentials, the BTESE sols generated by the hydrolysis polymerization reaction and the MoS2 nanosheets formed a continuous surface without lamellar boundary defects. With the increase of MoS2 content, the H2 transmittance of BTESE membranes showed an overall increasing trend in the range of 1.85 ~ 2.89 × 10-7 mol·m-2 s-1 Pa-1 (552 ~ 864 GPU), which was higher than that of the pristine H2 transmittance of the BTESE membrane (491 GPU). In addition, the H2/N2 selectivity of the optimized MoS2/BTESE membrane at 100 °C was 129, much higher than that of the pristine BTESE membrane of 17. These were attributed to the synergistic effect of BTESE and MoS2 nanosheets. Through adsorption isotherm tests, diffusion coefficients and energy calculations, it was found that the incorporation of nonporous MoS2 increased the density of the BTESE network, preventing the passage of N2, while good adsorption on the charged edge of the MoS2 promoted the adsorption of H2, and thus both permeability and selectivity were correspondingly enhanced, resulting in the material's excellent H2 separation capability.
Meanwhile, this approach also provides a novel mechanism for hydrogen separation.
Schematic principle of MoS2/BTESE networks for gas separation.
CIQTEK High Pressure Gas Adsorption Characterization Technology
Shandong University: Gas Storage Applications
The hydrogen storage capacity of cellulose carbon aerogel (CA) is shown in the following (a) figure. It can be seen that the hydrogen storage capacity of CA was significantly increased after activation by KOH.The hydrogen storage capacities of CA-KOH1 and CA-KOH2 were similar, and both of them were 0.61 wt% at room temperature and 80 bar hydrogen pressure. The following (b) figure shows the Langmuir linear fit for hydrogen adsorption, and it can be seen that the R2 is greater than 80%, which verifies the applicability of the Langmuir isotherm, and indicates that the hydrogen molecules above the boiling point of the adsorbent are physically adsorbed in a single layer on CA, and the specific surface area of the adsorbent is one of the important parameters influencing the performance of hydrogen adsorption. In addition, the material still shows a linear increasing trend at 80 Bar, which indicates that the surface coverage has not yet reached saturation.
(a)Hydrogen isotherm curves of activated CA at room temperature. (b)Hydrogen storage – Langmuir linear fitting curves.
The ability of CA materials to adsorb carbon dioxide at 25 °C and 30 Bar is shown below. With the increase of pressure, the adsorption capacity of the unKOH-activated CA material increased to 2.2 mmol/g and then remained unchanged. The KOH-activated CA-KOH2 sample had an adsorption capacity of 2.14 mmol/g at a low pressure of 0.5 bar, which could be increased to 16 mmol/g at a high pressure, which suggests that the KOH-activated biomass is an effective method for the development of high-quality CO2 adsorbent . The adsorption plateau was observed in all the samples except CA-KOH2, which indicated the saturation adsorption on the surface of the samples. Similarly, the linear fit of the Langmuir isotherm was above 95% as can be seen from the following (b) figure, which well verified the applicability of the Langmuir isotherm and demonstrated the monolayer adsorption characteristics of CO2 molecules on the adsorbent. Overall, the CO2 adsorption rates of these materials were much higher than those of other reported non-biomass materials (e.g., mesoporous carbon nitride, etc.), and the study demonstrated the practicality of waste biomass for CO2 capture.
(a)CO2 isotherm curves of activated CA at room temperature. (b)CO2 capture-Langmuir linear fitting curves.
Changzhou University: Gas Separation Applications
The adsorption capacities of organosilicon separation membranes, molybdenum disulfide nanosheets modified organosilicon separation membranes and pure molybdenum disulfide nanosheets for H2 and N2 are shown below. The adsorption capacity of molybdenum disulfide nanosheets for H2 is more than 60 times that of N2. This is due to the fact that the atoms at the edge of MoS2 are usually in an unsaturated coordination state, and H2 can be adsorbed as a result. The superior H2 adsorption properties make MoS2 suitable for storing H2, but its diffusion coefficient is low, making it unsuitable for separating H2 from N2 or CO2 alone. whereas BTESE with its microporous network exhibits a large diffusive difference between H2 and N2, but with a lower adsorption of H2 than that of N2. the incorporation of MoS2 into the BTESE network resulted in a higher adsorption capacity and diffusion of H2 than that of the original BTESE.As H2 is adsorbed at the active edge of MoS2, the neighboring atoms allow the hydrogen atoms to migrate to some inactive sites on the surface, and then transfer through the BTESE network, which leads to a significant enhancement of both the adsorption and diffusion capacities of H2 in the composites. Meanwhile, the structure of BTESE with the introduction of MoS2 is denser, which limits the adsorption capacity and diffusion capacity of the material for N2. Therefore, the coordinated effect of MoS2 and BTESE effectively realized the high H2/N2 separation performance of the composites.
H2 and N2 adsorption isotherms of (a)BTESE gels, (b)0.05 wt% MoS2/BTESE gels, and (c)MoS2 tested at 100 °C. 
CIQTEK High Temperature Hydrogen Storage Gas Adsorption Analyzer
EASY-H 1210 & 1420
High-temperature and high-pressure gas adsorption instrument can realize the adsorption capacity and separation capacity of materials for H2, CO2, N2, O2, CH4 and other gases under different temperatures and pressures, and can effectively characterize the adsorption and desorption characteristics of the materials and the relationship between the material adsorption and desorption temperatures and pressures, the amount of adsorption and desorption and adsorption and desorption selectivity of the materials such as the key adsorption and desorption of the material gas properties.
- Fully automatic software control
- Full range of test items (isotherm, kinetics, TPD, cycle test, etc.)
- Temperature range: room temperature-550 ℃, accuracy: ± 0.1 ℃ (optional low-temperature test system)
- Pressure range: vacuum-200 Bar, accuracy: 0.01 %FS (optional graded pressure testing system)
- Digital pressure acquisition, reduce noise error
- High integration and system accuracy, support for micro-sample (less than 100mg) measurement
- Substrate cavity temperature control, temperature control range: room temperature ~ 50 ℃, temperature control accuracy: ± 0.1 ℃
Scientific researches on CIQTEK Products
EASY-H 1210 and EASY-H 1420 high-pressure and high-temperature gas adsorption analyzers are high-performance adsorption and desorption isotherms testing instruments independently developed by CIQTEK, which adopts the static volumetric method. The range of isothermal temperatures and pressures can be tested to meet the needs of many research fields. The product has a high-temperature and high-pressure adsorption testing function and a unique PCT isotherm and hydrogen absorption and desorption pressure platform, which can be widely used in rare earth alloy material hydrogen storage industry, shale gas, and coalbed methane adsorption research, petroleum exploration and gas separation and other fields; it is also important for understanding the adsorption performance of some adsorption materials such as catalysts, molecular sieves, and activated carbon, the research of fuel cells, carbon nanotubes, and graphene.Learn More
EASY-H 2210 and EASY-H 2420 high-pressure and high-temperature gas adsorption analyzer are high-performance adsorption and desorption isotherms testing instruments independently developed by CIQTEK, which adopts the static volumetric method. EASY-H 2210 and EASY-H 2420 high-pressure and high-temperature gas adsorption analyzers are high-performance adsorption and desorption isotherms testing instruments independently developed by CIQTEK, which adopts the static volumetric method.Learn More