Brzilian passport holder will transit in Beijing, a visa needed?

I have a brazilian passport and my flight will arrive in Beijing from Paris on 19th March at 12:35 and I will leave Beijing to Bangkok on 22nd march at 19:45.
I believe I won't need any entry permit as flight itinerary meets the requirements.
On 5th April, I will come back to London from Phuket, which means I will have to stop at Beijing for my connection flight (Phuket - Beijing - London).
Do I need an entry permit for this, even if I won't leave the airport?