| abstract |
(2) a total pore volume (PV T ) of 0.80 to 1.50 ml / g as measured by mercury porosimetry; and (2) (3) a pore diameter distribution in the range of 10 to 30 nm, (4) a ratio of the pore volume (DELTA PV) in the range of the pore diameter in the maximum value of +/- 2 nm (PVME) in a pore volume (PVme) in the range of 5 to 100 nm in diameter is 0.40 or less, (5) the pressure resistance strength is 10 N / mm or more, (6) P 2 O 5 concentration in terms containing 0.4 ~ 10.0% by mass as the amount, and (7) the hydrogenation active metal is at least one kind of metal selected from the periodic table Group 6A metals and Group VIII metals. |