do i need a visa to transit in Beijing for few hours?

my airline from dubai to manila is air china and the stopover is beijing on june 14 and going to manila is on june 16..so what i did is ..i bought another ticket going to manila via cebu pacific that will depart june 15 1am.the problem is ..i will be in terminal 3 on my arrival in beijing but i have to go to terminal 2 on my departure ..do i need a visa ?