Nickel’s Big Promotion: A Tiny Atomic Structure, Not Metallic Nickel, Drives Methane Conversion

For decades, chemists believed they knew exactly what made nickel such a good catalyst for converting methane. They were wrong, in the most interesting way possible. New research shows that a tiny atomic structure that forms on nickel oxide during methane conversion is more effective than the metallic nickel long believed to drive the reaction.

Methane conversion is big business. The gas is abundant, cheap, and environmentally troublesome: if it leaks or is simply burned off, it is a potent contributor to climate change. Turning methane into more useful chemicals and fuels instead of flaring it is one of the holy grails of industrial chemistry, and nickel-based catalysts have long been the workhorses of that effort.

The twist

The researchers discovered that during the reaction, the surface of the catalyst reorganizes itself. Instead of plain metallic nickel doing the work, a delicate structure of atoms forms on nickel oxide, and it turns out to be the real engine of the conversion, outperforming the metal that textbooks credit.

Why it matters

Catalysts underpin most of modern industry: fertilizers, fuels, plastics, and pharmaceuticals all depend on them. Discovering that the true active site of a major catalytic process is something other than what was assumed opens the door to designing better catalysts on purpose rather than by trial and error.

For the energy transition, the stakes are concrete. More efficient methane conversion means less waste, lower emissions from natural gas operations, and a better path for turning a problematic greenhouse gas into useful products.

Featured image: blue methane flames at the 2018 Kilauea eruption, USGS (public domain). Source: ScienceDaily.