Generally the volume ratio of solution to catalyst in the wet impregnation method depends on various factors, such as the desired loading of the catalyst, the pore size of the support material, and the solubility of the catalyst in the solvent. Typically, the volume ratio of solution to catalyst can range from 1:1 to 1000:1.

However, a general guideline for the volume ratio in the wet impregnation method is to use a volume of impregnation solution that is sufficient to completely wet the support material, while keeping the amount of solvent used to a minimum to avoid excess waste and reduce the drying time. In most cases, a volume ratio of 5:1 to 10:1 of solution to catalyst is commonly used for practical applications.

It is important to note that the volume ratio is just one of the parameters to consider when performing the wet impregnation method, and it should be optimized based on the specific catalyst and support material used, as well as the intended application.

I appreciate your response Aurobindo Patnaik

I am going to modify the zeolite 13X using calcium hydroxide(5wt%) and based on my research wet impregnation is the optimum method. I have to mention the zeolite is not in powder form, it's granulated(mesh 30-50).

If you have any information in this field or some instructions on this method, please let me know.

Thank you in advance for you help