function enableCatalog($arrayOfLists)
{
    foreach($list in $arrayOfLists)
    {
        write-host "Enabling catalog on list " $list -foregroundcolor Yellow
        $list.IndexedRootFolderPropertyKeys.Add("PublishingCatalogSettings")
        $list.IndexedRootFolderPropertyKeys.Add("IsPublishingCatalog")

        #Break permission inheritance
        $list.BreakRoleInheritance($true,$true)

        #Enable anonymous to the catalog
        $list.AnonymousPermMask = 8192 # 0 to disable anonymous

        $rootFolder = $list.RootFolder
        $rootFolder.Properties.Add("IsPublishingCatalog", "True") #Activate catalog

        $rootFolder.Update()
        $list.Update()
        write-host "Catalog successfully enabled on " $list -foregroundcolor Green
    }
}

$lists = <an array of list objects>

enableCatalog $lists

$web.Dispose()
$site.Dispose()