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A catalyst is a substance that increases the rate of a chemical reaction without itself being consumed by the reaction. It does this by providing an alternative reaction pathway with a lower activation energy. The activation energy is the minimum energy required for a reaction to occur, and by lowering this energy, the catalyst increases the likelihood of the reaction happening.

One way catalysts make processes more energy efficient is by reducing the activation energy, which is the energy barrier that must be overcome for a reaction to proceed. Lower activation energies mean that more particles have enough energy to react, increasing the rate of reaction. A higher reaction rate means that the process can be completed in a shorter time, leading to increased energy savings. Moreover, reactions with catalysts often require less heat energy to be added or removed from the system, which can increase energy efficiency by reducing the amount of energy wasted as heat.

A real-world example of a process that has been made more energy-efficient through the use of catalysts is the Haber-Bosch process for the production of ammonia. The reaction that takes place in the Haber-Bosch process is the combination of nitrogen and hydrogen gases to form ammonia: \[ N_2 (g) + 3 H_2 (g) \rightleftharpoons 2 NH_3 (g) \] This reaction has a high activation energy, which means that it would be very slow and energy-intensive without a catalyst. In the Haber-Bosch process, an iron catalyst is used to significantly lower the activation energy. This allows the reaction to proceed at much faster rates, and at much lower temperatures and pressures than would otherwise be possible. As a result, the process of producing ammonia from nitrogen and hydrogen gases becomes much more energy-efficient. In conclusion, catalysts can make processes more energy efficient by providing an alternative reaction pathway with lowered activation energy, allowing reactions to proceed at a faster rate under less extreme conditions. This can lead to significant energy savings and a reduced environmental impact of industrial processes.