Scientists uncover a new aluminum form that could replace rare metals in chemistry

Aluminum was once a rare and precious metal, costing nearly as much as silver in the 19th century. By the early 1900s, its price plummeted, transforming industries worldwide. Now, scientists are exploring a new form of aluminum that could revolutionise catalysis once again.

In 1852, refined aluminum sold for around $550 per pound—almost the same price as silver. Its rarity made it a symbol of luxury, which is why a 100-ounce pyramid of near-solid aluminum crowned the Washington Monument in 1884. But by the start of the 20th century, production advances slashed the cost to under $1 per pound, making it widely accessible.

Today, researchers are developing a new aluminum structure called *cyclotrialumane*. This compound arranges three aluminum atoms in a triangular formation, creating a highly reactive yet eco-friendly material. Early tests show it can split dihydrogen and produce ethene, reactions usually requiring expensive platinum group metals (PGMs). PGMs are essential for many chemical processes but are costly and harmful to extract. The new aluminum-based catalyst could offer a cheaper, more sustainable alternative. Scientists believe its reactivity may even surpass that of traditional transition metals.

The discovery of cyclotrialumane suggests aluminum could again become a game-changer in chemistry. With lower costs and reduced environmental impact, this innovation might replace rare metals in key industrial processes. The shift mirrors aluminum's past transformation from a luxury item to a common resource.