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Review of technologies that boost potential for carbon dioxide conversion to useful products

Technologies increase the potential for converting carbon dioxide into useful products

With the well-defined reticular frameworks and flexible adaptability, metal-organic frameworks (MOFs) can be the ideal platform to construct the enabled catalysts for carbon dioxide hydrogenation with the improvement of the catalytic activity and precise control of the selectivity. Credit: Tsinghua University Press

Excessive emissions of greenhouse gases, especially carbon dioxide, are rapidly increasing the global average temperature. Capturing carbon dioxide and converting it into useful fuels and chemicals can be an ideal way to reduce carbon dioxide concentrations and alleviate this serious environmental problem.

One of the promising technologies for the conversion of carbon dioxide is the hydrogenation of carbon dioxide. There is great interest because hydrogen is a green and sustainable energy that can be produced continuously. To advance the technology, several researchers have tested a range of catalysts for the hydrogenation of carbon dioxide, but there are still challenges in applying these catalysts in industrial settings. Metal-organic framework based catalysts provide an alternative to traditional catalysts for these technologies. For example, the team of researchers has systematically assessed metal-organic framework-based catalysts for selective hydrogenation of carbon dioxide with the aim of developing catalysts that have great potential in future carbon dioxide hydrogenation applications.

The team published their findings in Nano-research

Capturing carbon dioxide has become an important way to reduce its negative effects on the environment. But once the carbon dioxide is captured, researchers face the challenge of what to do with the captured carbon dioxide, because there has been no industrial use for such a large amount of carbon dioxide in the past. Knowing that natural carbon dioxide hydrogenation has produced fossil energy resources, such as oil, coal and natural gas, during photosynthesis, researchers have determined that synthetic carbon dioxide hydrogenation has great potential as a method of reusing the captured carbon dioxide.

But finding the right catalyst for use in the hydrogenation of carbon dioxide has been challenging, because traditional catalysts require a high temperature to convert the carbon dioxide. These severe heat conditions increase CO2 emissions and ensure rapid sintering of the active ingredients. And the limited catalytic activity and selectivity for hydrogenation of carbon dioxide over traditional catalysts still hinder development in the industrial environment. The researchers wanted to construct new catalysts for the hydrogenation of carbon dioxide with the higher catalytic performance in the milder conditions, especially to avoid the high temperature.

The researchers turned their attention to metal-organic framework based catalysts. The metal-organic frameworks, a class of crystalline materials, can provide an ideal platform to build new catalysts for the hydrogenation of carbon dioxide under mild conditions. The metal-organic frameworks offer the advantage of being tunable frameworks with well-defined pores that encourage the construction of diverse catalytic sites. These catalytic structures can be used for various products, such as carbon monoxide, methane, formic acid, methanol and C2+ Products. In their study, the team conducted a detailed, systematic review of a variety of metal-organic framework-based catalysts for potential use in the selective hydrogenation of carbon dioxide.

While much progress has been made in the development of metal-organic framework-based catalysts, the researchers note that several challenges remain. More in-depth research is needed to address these issues. Looking ahead to future research on metal-organic framework based catalysts, the researchers make four recommendations for possible future studies.

First, they suggest that more elaborate design and precise synthesis are needed when constructing the interface structures in the metal-organic frameworks. Next, the researchers suggest that carbon dioxide conversion at low temperatures can be enhanced by introducing functional sites into the metal-organic frameworks to aid in the activation of the carbon dioxide. Their third recommendation is that a more in-depth design of catalytic sites within the metal-organic frameworks is needed to reduce the dependence of target product selectivity on the intrinsic properties of metals. Their final recommendation is to develop high pressure in situ characterization technologies, such as high pressure in situ X-ray absorption spectroscopy, X-ray diffraction analysis and Raman spectroscopy, to characterize the dynamic structural change of metal-organic framework based catalysts during carbon. dioxide hydrogenation under high pressure.

“We hope that our discussion on metal-organic framework-based catalysts for selective hydrogenation of carbon dioxide can provide some insight for developing the activated catalysts to achieve high activity, excellent selectivity and good stability. We believe that metal-based Organic framework-based catalysts have the great development prospects and application potential in carbon dioxide hydrogenation under mild conditions in the future,” said Guodong Li, a professor at the National Center for Nanoscience and Technology.

Discovery of a new catalyst for highly active and selective hydrogenation of carbon dioxide to methanol

More information:
Shengxian Shao et al, Recent developments in metal-organic frameworks for catalytic CO2 hydrogenation to various products, Nano-research (2022). DOI: 10.1007/s12274-022-4576-z

Provided by Tsinghua University Press

Quote: Assessment of technologies that increase the potential for the conversion of carbon dioxide into useful products (2022, July 1,), retrieved July 2, 2022 from https://phys.org/news/2022-07-technologies-boost-potential-carbon -dioxide.html

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