Transfer in Xian for Terracotta Warriors

Hi, I have a bit of a crazy idea. If I book a Guilin to Beijing plane ticket, I will transfer in Xi'an. Is it possible to go from the airport to see the Terracotta Warriors and back in say, 6 hours? :) According to the ticket, I would arrive to Xian at 12 and the flight to Beijing would be at 21.

Thank you