New, highly efficient catalyst for propylene production

Researchers have developed an innovative catalyst for the synthesis of propylene, which has potential benefits for the chemical industry and carbon recycling.


(Left) The platinum-cobalt-indium catalyst in powder form; (Right) an electron micrograph of the catalyst (structure in top inset) on cerium oxide (CeO2, structure in bottom inset) support (Shinya Furukawa).

Propylene is a colourless, flammable hydrocarbon gas that is an important raw material for the production of a variety of petrochemicals. Due to increasing demand and limited global supply, there is a strong need to develop new, efficient technologies for its production.

Researchers at Hokkaido University have developed an innovative catalyst for the production of propylene that is highly active, selective, stable and utilizes carbon dioxide (CO2) efficiently. Their findings were reported in the journal Nature Catalysis.

One promising technique for producing propylene is a chemical reaction, called oxidative dehydrogenation, that uses CO2 to convert propane gas into propylene by removing hydrogen. However, existing catalysts used to speed up this chemical reaction aren’t very efficient.

“The challenge is to develop a catalyst that will activate both reactants – propane and CO2 – without unwanted side reactions. It also needs to be stable and reusable in the long term,” explains Hokkaido University molecular engineer, Shinya Furukawa.

To achieve this, Furukawa and his colleagues developed a catalyst made from three different metals (platinum, cobalt and indium), each chosen for its specific properties. Platinum was selected as the main active metal because of its ability to break chemical bonds between carbon and hydrogen, enabling the dehydrogenation reaction. Cobalt accelerates CO2 capture and activation, while indium enhances the catalyst’s selectivity. The metals were fixed to a support made from cerium oxide, a compound commonly used in car catalytic converters.


Mechanism of the catalytic action. Platinum converts propane (C3H8) to form propylene (C3H6), while cobalt captures and activates CO2. When mixed together with indium and fixed on a cerium oxide support (CeO), the formation of propylene is linked to the deoxygenation of CO2, and is specific to propane. Water (H2O) and carbon oxides (COx) are formed as byproducts (Shinya Furukawa).

The researchers tested the catalyst’s activity at 550°C and compared the results with existing catalysts. They also performed a mechanistic study to understand the functions of the different components and found the catalyst links the propylene-forming reaction to the deoxygenation of CO2, and ensures the catalytic activity is specific to propane; water and carbon oxides are formed as byproducts. Further, they found that the catalyst increased the reaction rate approximately five fold compared to the typical values reported from other systems. The reaction produced a higher ratio of propylene and utilized more CO2 at 550°C compared to previous catalysts. The catalyst also showed good long-term stability and reusability.

“To date, no other catalyst has been shown to simultaneously exhibit a high catalytic activity, selectivity, stability, and CO2 utilization efficiency. Our multifunctional material meets all these requirements,” says Furukawa.

This study provides new insights into the design of highly efficient catalysts for petrochemical production, and has potential benefits for carbon recycling and greenhouse gas reduction.


Feilong Xing (left) and Shinya Furukawa (right), key authors of this study (Photo: Feilong Xing, Shinya Furukawa).

Original Article:

Feilong Xing, et al. Ternary platinum-cobalt-indium nanoalloy on ceria as a highly efficient catalyst for the oxidative dehydrogenation of propane using CO2. Nature Catalysis. January 27, 2022.

DOI: 10.1038/s41929-021-00730-x

Funding:

This work was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI (17H01341, 17H04965, 20H02517); the Ministry of Education, Culture, Sports, Science and Technology (MEXT) project Element Strategy Initiative (JPMXP0112101003); Japan Science and Technology Agency (JST) Core Research for Evolutional Science and Technology (CREST; JPMJCR17J3) and Precursory Research for Embryonic Science and Technology (PRESTO; JPMJPR19T7); and the Collaborative Research Projects of Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology. The XAFS analysis was performed with the approval of the Japan Synchrotron Radiation Research Institute (JASRI; 2019B1620 and 2019B1469).

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