Wednesday, February 19, 2025

A catalytic two-step: Transforming industrial CO2 into a renewable fuel

Problem solved! There are several technologies out there to recycle atmospheric CO2. Here is another one.

"... In a new study ... describe their latest breakthrough in creating methanol — a widely used liquid fuel for internal combustion and other engines — from industrial emissions of CO2, a primary greenhouse gas contributing to climate change. ...

Transforming CO2 into methanol is a two-step chemical reaction.
First, CO2 reacts with a catalyst to become carbon monoxide (CO).
The CO then undergoes a catalytic reaction to become methanol. ...

The new process starts with a nickel tetramethoxyphthalocyanine site for the conversion of CO2 into CO. The newly formed CO then migrates onto a cobalt site — catalysis scientists refer to this as “spillover” — to complete the reduction into methanol. ..."

From the abstract:
"Cobalt phthalocyanine (CoPc) is recognized for catalysing electrochemical CO2 reduction into methanol at high Faradaic efficiency but is subject to deactivation. Cobalt tetraaminophthalocyanine (CoPc-NH2) shows improved stability, but its methanol Faradaic efficiency is below 30%.
This study addresses these limitations in selectivity, reactivity and stability by rationally designing a dual-site cascade catalyst. Here we quantify the local concentration of CO, a key intermediate of the reaction, near a working CoPc-NH2 catalyst and show that co-loading nickel tetramethoxyphthalocyanine (NiPc-OCH3) with CoPc-NH2 on multiwalled carbon nanotubes increases the generation and local concentration of CO. This dual-site cascade catalyst exhibits substantially higher performance than the original single-site CoPc-NH2/carbon nanotube catalyst, reaching a partial current density of 150 mA cm−2 and a Faradaic efficiency of 50% for methanol production. Kinetic analysis and in situ sum-frequency generation vibrational spectroscopy attribute this notable performance improvement to molecular-scale CO spillover from NiPc-OCH3 sites to methanol-active CoPc-NH2 sites."

A catalytic two-step: Transforming industrial CO2 into a renewable fuel | Yale News

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