Thai transit in Beijing from US flight ...???

My Thai friend is looking at flights to Bangkok from the US. PEK is a good airfare option for flight connection to Bangkok.
Thai has US tourist visa. Has had 3 prior China tourist visas issued by the China Embassy in Bangkok. None now.
Can the Thai get 24 hour transit visa on arrival at Beijing?
Can the Thai leave the airport to stay in nearby airport hotel for one night?
Many of the US flights arrive in PEK late and few transit flights to Bangkok available.
Can a Thai obtain a China tourist visa while already visiting in the USA?
Thank you for your helpful assist.