Despite its importance, achieving optimal metal loading is challenging:
1. Uniform Distribution: Achieving a uniform distribution of metal on the support material can be difficult. 2. Agglomeration: At high loadings, metal particles may agglomerate, reducing the number of active sites. 3. Cost: High metal loadings, especially with precious metals, can be cost-prohibitive. 4. Deactivation: Metals may deactivate over time due to sintering, poisoning, or leaching.
