Transit for 15 hrs via Guangzhou Baiyun Airport (CAN)

Hi,

Im travelling from Phnom Phenn to London Heathrow with a 15hr lay over at Guangzhou Baiyun Airport (CAN).
I would like to stay the night in a hotel during the transit duration. Is it possible to leave the airport and stay at a local hotel without a visa.

If not how can I get it to leave the airport.