Characterization and Catalytic Performance of Niobic Acid Dispersed over Titanium Silicalite

Table 4

Catalytic activity of the XNb/TS-1 in the epoxidation of 1-octene with H₂O₂ at 70^°C for 48 h.

Catalyst	Conversion, %^(#)	Brønsted, 𝜇mol	Diol, 𝜇mol	TOF, 10−1 h−1(∗)	Selectivity, % ^(‡)
NBO	0.25	—	—	—	—
NBA	0.19	—	—	—	—
TS-1	1.63	0	20	—	1.21
3Nb/TS-1	1.53	1.0	73	32	4.75
10Nb/TS-1	1.81	2.8	105	15	5.82
20Nb/TS-1	1.68	4.6	133	13	7.93

^(#)mmol of 1-octene reacted.^(‡)mmol of 1,2-octanediol per mmol of 1-octene reacted, in %.^(*)TOF is calculated on the basis of the total Brønsted acid in the catalysts for the production of 1,2-octanediol.