Thai passport holder and transit Bejing ?

My Thai friend (Thai passport holder) is now visiting in the USA on US tourist visa from Thailand.
In planning the return flights to Bangkok...from Detroit to Beijing or from Seattle to Beijing...
(1)Can a Thai passport holder transit thru Beijing (PEK) for 24 hours?
(2)Can they leave the airport for overnight airport hotel night of arrival at PEK and fly within 24 hours of arrival next day to BKK?
With an evening arrival into PEK there are few options to fly out same evening to BKK.
The Thai has held China Tourist L types three times before. Most recent one was issued in 2017 by China Embassy Bangkok on 24 August 2017 with expiration date of 24 November 2017 but was unable to use it.
Thank you for your assist.