How a single woman discovered the secret to accelerating chemical reactions
In short: Chemical reactions can be slow, but catalysts change the game by lowering the energy required to start them. While this process is vital to modern industry and biology, our understanding of this mechanism began over 225 years ago with the groundbreaking work of Elizabeth Fulhame.
At its core, catalysis is the process of increasing the rate of a chemical reaction by adding a specific material. In a standard reaction, reactants are transformed into products with different properties, a process that requires a certain amount of energy known as activation energy. A catalyst works by lowering this energy threshold, often by stabilizing a transition state or bringing reactants into closer proximity. This allows the reaction to occur more frequently at a given temperature without the catalyst itself being consumed or transformed into a product.
The field is broadly categorized into three types. Homogeneous catalysis occurs when both the reactants and the catalyst are in the same solution, such as an aqueous or organic solvent. While this allows for high reactivity, separating the components later can be difficult. Heterogeneous catalysis involves a catalyst in a different state than the reactants; for instance, gas or liquid reactants might be passed over a solid catalyst, like zeolite, which features cage-like structures. This method is widely used in industrial processes because it allows for easy recovery of the catalyst and separation of the final products.
Beyond the laboratory, catalysis is fundamental to life and modern technology. It is the mechanism behind the enzymes and ribozymes that drive biological reactions within our cells. In our daily lives, it is present in everything from the catalytic converters in vehicles to the production of plastic water bottles and even the cleaning of contact lenses. The discovery of these mechanisms, pioneered by Elizabeth Fulhame, continues to drive innovation in energy, materials, and sustainability.
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Sources
- Summary by Intellect · source: Making Reactions Go Faster Since the 1700s | Great Minds: Elizabeth Fulhame
- Also: Catalysis | PNNL
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