Which version of Lightroom are you using?
With your New catalog Are you able to View your Presets in Preferences folder (For Mac: Lightroom> Preferences ,For Windows PC: Edit>Preferences).
- Choose the Presets Tab from the new window
- click on "Show Lightroom Presets" Folder.
This link might be helpful 3 Steps to Transfer Your Pretty Presets to a New Computer | Pretty Presets for Lightroom
CC version. I have already done it and, as I wrote before, the presets were gone from the older catalog that is located in a different external drive.
Check where the Catalog is located in your external drive
If you had the "Store Presets with catalog" enabled in older catalog
You'd see a Folder Lightroom Settings in that location
It should contain all your Presets
You need to copy them over to Default location
MAC:-/Users/[user name]/Library/Application Support/Adobe/Lightroom
Check to see if you have the option "save presets with catalog" turned on.