Realumination is not without its challenges. Some of the key challenges include:
1. Selective Incorporation: Ensuring that the aluminum is selectively incorporated into the framework rather than forming extra-framework aluminum species, which do not contribute to the catalytic activity.
2. Framework Stability: Maintaining the structural integrity of the zeolite framework during the realumination process is crucial. Harsh treatment conditions can lead to the collapse of the framework.
3. Control of Aluminum Distribution: Achieving a uniform distribution of aluminum within the framework can be challenging. Uneven distribution can lead to the formation of acid sites with varying strengths, which can affect the catalytic performance.
