Yes, you can, up to 2 years without damaging its structure. Keep it in the original packaging and air-tight and you are good to go!
I believe it is a powder before it is set to refrigerate.
Baking Powder
Refrigerate dough for at least 30 minutes before baking to help it firm up and hold its shape better during baking.
Baking powder in a recipe helps your item rise when baking.
baking powerder is baking powder is not the same!
baking powder
Baking soda does not rise as well as baking powder
No, baking powder does not absorb odors when used in baking.
Baking soda is an alternative to baking powder that can be used in baking recipes.
baking powder is neutral
Baking powder is an acid
the ingredients of baking powder are baking soda and cream of tartar. So baking powder has less baking soda per amount.