New Catalyst Can Turn a Smelly Gas Byproduct Into a Cash Cow

Chemistry Catalyst Concept

Another benefit is that light is the only source of energy used in the one-step process.

A catalyst activated by light converts hydrogen sulfide into hydrogen energy in one step.

Engineers and scientists at Rice University have developed a sweet way for petrochemical refineries to transform a smelly byproduct into cash.

Hydrogen sulfide gas has the distinct odor of rotting eggs. It frequently emanates from sewers, stockyards, and landfills, but it is especially problematic for refineries, petrochemical plants, and other industries. Thousands of tons of the noxious gas are produced annually as a byproduct of processes that remove sulfur from petroleum, natural gas, coal, and other products in these places.

Naomi Halas, a Rice engineer, physicist, and chemist, and colleagues describe a process that uses gold nanoparticles to convert hydrogen sulfide into sulfur and high-demand hydrogen gas in a single step in a study that was recently published in the journal ACS Energy Letters. Even better, the one-step process only needs light as its source of energy. Co-authors of the study include Hossein Robatjazi of Syzygy Plasmonics, Emily Carter of Princeton University, and Peter Nordlander of Rice University.

Illustration of Light Powered, One Step Catalytic Remediation of Hydrogen Sulfide Gas

An illustration of the light-powered, one-step remediation process for hydrogen sulfide gas made possible by a gold photocatalyst created at Rice University. Credit: Halas Group/Rice University

“Hydrogen sulfide emissions can result in hefty fines for industry, but remediation is also very expensive,” said Halas, a nanophotonics pioneer whose lab has spent years developing commercially viable light-activated nanocatalysts. “The phrase ‘game-changer’ is overused, but in this case, it applies. Implementing plasmonic photocatalysis should be far less expensive than traditional remediation, and it has the added potential of transforming a costly burden into an increasingly valuable commodity.”

Naomi Halas

Rice University’s Naomi Halas is an engineer, chemist, physicist, and pioneer in the field of light-activated nanomaterials. Credit: Jeff Fitlow/Rice University

Each molecule of hydrogen sulfide gas (H2S) contains two hydrogen atoms and one sulfur

Halas said the remediation process could wind up having low enough implementation costs and high enough efficiency to become economical for cleaning up nonindustrial hydrogen sulfide from sources like sewer gas and animal wastes.

“Given that it requires only visible light and no external heating, the process should be relatively straightforward to scale up using renewable solar energy or highly efficient solid-state LED lighting,” she said.

Reference: “Direct H2S Decomposition by Plasmonic Photocatalysis: Efficient Remediation plus Sustainable Hydrogen Production” by Minghe Lou, Junwei Lucas Bao, Linan Zhou, Gopal Narmada Naidu, Hossein Robatjazi, Aaron I. Bayles, Henry O. Everitt, Peter Nordlander, Emily A. Carter and Naomi J. Halas, 30 September 2022, ACS…

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