Does anybody know if there is a limit to how many recipes you can own?
I'm not aware of a specific limit in the number of recipes you can own.
I have read that you can't select more than 2 pages worth of treasure cards (16 cards), and I have discovered myself that you can't select from more than 3 pages of specific item type recipes (i.e. rings). So you are currently limited to 24 recipes of each item type.
This problem seems to be corrected in the Test Realm. I bought a great number of recipes of my favorite item type, and was able to access all of them.