How to remove chloride ions during catalyst?

If it is an impregnated method, it is best not to choose a front drive of chlorine, if you have to choose!Generally, high temperature can be removed!If it is prepared by the precipitation method, you can remove it!

550 degrees Celsius

This has nothing to do with the temperature. Washing of water can be washed off. As long as there is no chloride ion in the filter fluid, it is thought.

Yes.I generally take direct water washing, using silver nitrate to detect the filter fluid

It may require high temperature if you bake, and you can wash it. Generally, wash 3-5 times, basically nothing