Incomplete cleaning can have several negative consequences: - Reduced catalytic activity: Contaminants can block the active sites, decreasing the catalyst's efficiency. - Shortened catalyst lifespan: Accumulated impurities can lead to the deactivation of the catalyst over time. - Selectivity issues: Contaminants can cause undesirable side reactions, affecting the selectivity of the catalyst. - Increased operational costs: Frequent catalyst replacement or regeneration can lead to higher operational expenses.