Graphene-wrapped zeolite membranes for fast hydrogen separation

Graphene-wrapped zeolite membranes for fast hydrogen separation
Figure 1. Transmission electron micrograph of graphene-wrapped zeolite. Credit: The Authors

The effects of global warming are becoming more serious, and there is a strong demand for technological advances to reduce carbon dioxide emissions. Hydrogen is an ideal clean energy which produces water when burned. To promote the use of hydrogen energy, it is essential to develop safe, energy-saving technologies for hydrogen production and storage. Currently, hydrogen is made from natural gas, so it is not appropriate for decarbonization. Using a lot of energy to separate hydrogen would not make it qualify as clean energy.

Polymer separation membranes have the great advantage of enlarging the separation and increasing the separation coefficient. However, the speed of permeation through the membrane is extremely low, and must be applied to increase the permeation speed. Therefore, a large amount of energy is required for separation using a polymer separation membrane. The goal is to create a new kind of separation membrane technology that can achieve separation speeds that are 50 times faster than that of conventional separation membranes.

The -wrapped molecular-sieving membrane prepared in this study has a separation factor of 245 and a permeation coefficient of 5.8 x 106 barrers, which is more than 100 times better than that of conventional polymer separation membranes. If the size of the separation membrane is increased in the future, it is very probable that an energy-saving separation process will be established for the separation of important gases such as carbon dioxide and oxygen as well as .

As seen in the transmission electron microscope image in Figure 1, graphene is wrapped around the MFI-type crystal, being hydrophobic. The wrapping uses the principles of colloidal science to keep graphene and zeolite crystal planes close to each other due to reduction of the repulsive interaction. About five layers of graphene enclose zeolite crystals in this figure. Around the red arrow, there is a narrow interface space where only hydrogen can permeate. Graphene is also present on hydrophobic zeolite, so the structure of the zeolite crystal cannot be seen with this. Since a strong attractive force acts between graphene, the zeolite crystals wrapped with graphene are in close contact with each other by a simple compression treatment and does not let any gas through.

Figure 2 shows a model in which zeolite crystals wrapped with graphene are in contact with each other. The surface of the zeolite crystal has grooves derived from the structure, and there is an interfacial channel between zeolite and graphene through which hydrogen molecules can selectively permeate. The model in which the black circles are connected is graphene, and there are nano-windows represented by blanks in some places. Any gas can freely permeate the nanowindows, but the very narrow channels between graphene and zeolite crystal faces allow hydrogen to permeate preferentially. This structure allows efficient separation of hydrogen and methane. On the other hand, the movement of hydrogen is rapid because there are many voids between the graphene-wrapped zeolite particles. For this reason, ultra-high-speed permeation is possible while maintaining the high separation factor of 200 or more.

Graphene-wrapped zeolite membranes for fast hydrogen separation
Figure 2. The black circle connection is a one-layer graphene model, and the nano window is shown as blank. Red hydrogen permeates the gap between graphene and the surface of the zeolite crystal. On the other hand, large CH4 molecules are difficult to permeate. Credit: The Authors

Figure 3 compares the hydrogen separation factor and gas permeation coefficient for methane with the previously reported separation membranes. This separation membrane separates hydrogen at a speed of about 100 times while maintaining a higher separation coefficient than conventional separation membranes. The farther in the direction of the arrow, the better the performance. This newly developed separation membrane has paved the way for energy-saving separation technologies for the first time.

Graphene-wrapped zeolite membranes for fast hydrogen separation
Figure 3. The measurement point of this separation membrane is within the red dotted line. Credit: The Authors

In addition, this separation principle is different from the conventional dissolution mechanism with polymers and the separation mechanism with in zeolite separation membranes, and it depends on the separation target by selecting the surface structure of zeolite or another crystal. High-speed separation for any target gas is possible in principle. For this reason, if the industrial manufacturing method of this separation membrane and the separation membrane becomes scalable, the chemical industry, combustion industry, and other industries can enjoy significantly improved energy consumption, leading to a significant reduction in carbon dioxide emissions. Currently, the group is conducting research toward the establishment of basic technology for rapidly producing a large amount of enriched oxygen from air. The development of enriched oxygen manufacturing technologies will revolutionize the steel and and even medicine.

The research was published in Science Advances.


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More information: Radovan Kukobat et al, Ultrapermeable 2D-channeled graphene-wrapped zeolite molecular sieving membranes for hydrogen separation, Science Advances (2022). DOI: 10.1126/sciadv.abl3521. www.science.org/doi/10.1126/sciadv.abl3521
Journal information: Science Advances

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Citation: Graphene-wrapped zeolite membranes for fast hydrogen separation (2022, May 18) retrieved 27 June 2022 from https://phys.org/news/2022-05-graphene-wrapped-zeolite-membranes-fast-hydrogen.html
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