Fig. 9. The N₂ isotherms and pore diameter distribution of three catalysts for three run times (A) (a) MIL-101-SO₃H_HCl, (b) MIL-101-SO₃H_NaAC, (c) MIL-101-SO₃H_HF and MIL-101-SO₃H_HCl with different run times (B), (d) fresh MIL-101-SO₃H_HCl, (e) MIL-101-SO₃H_HCl run 1, (f) MIL-101-SO₃H_HCl run 3, (g) MIL-101-SO₃H_HCl run 5.