Catalyst regeneration is a process used to restore the activity of catalysts, which are substances that speed up chemical reactions without being consumed. Over time, catalysts can become less effective due to factors like poisoning, fouling, or sintering. Regeneration techniques often involve heating, washing, or chemical treatments to remove impurities and restore the catalyst's original properties. This process is crucial in various industries, including petrochemicals and environmental engineering, where catalysts play a vital role in improving efficiency and reducing waste. By regenerating catalysts, companies can save costs, minimize environmental impact, and enhance overall productivity.