His speech was broadcast on Qatari television on Wednesday afternoon.
Later in the evening, a cabinet reshuffle was announced with Abdallah Bin Nasser Bin Khalifa Al Thani is the new prime minister, replacing the long-serving Sheikh Hamad bin Jassim Al Thani, according to Qatar news agency.
Meanwhile Khalid al-Atiyah has been announced as foreign minister and Ali Sherif al-Emadi the new finance minister.
The 33-year-old promised he would continue his father’s “path”
In terms of foreign policy, he said that his country rejects sectarianism in Arab societies while stressing that Qatar was committed to the cause of Palestine, and would work to end Israeli occupation, according to Al Jazeera.
The news agency added that there wasn’t any mention of specific policies in places such as Syria.
Tamim is the fourth son of the Emir of Qatar, Sheikh Hamad bin Khalifa Al Thani, and the second child of the Emir with his second wife, Sheikha Mozah bint Nasser Al Missned.
His father, Sheikh Hamad came to power in a coup when he overthrew his own father Sheikh Khalifa in June 1995 while he was in Geneva, Switzerland.
The Emir is famous for helping to establish the first Arab international news network, Al Jazeera.
Qatar holds the world’s third largest natural gas reserves and is the single largest supplier of liquefied natural gas. Qatar is also a member of OPEC and is a significant net exporter of oil.