中文摘要：

The first chromia-pillared layered tetratitanate was prepared by the reaction of layered tetramethy-lammonium tetratitanate with chromium(Ⅲ) acetate [Cr(OAc)3] aqueous solution and subsequent calcination of the resultant solid product in air at 400℃. The obtained chromia-pillared layered tetratitanate has an interlayer distance of 1.06 nm and a high thermal stabih’ty up to 600℃. It was also found that calcination in N2 led to the chromia-pillared layered tetratitanate with relatively higher Brunauer-Emmett-Teller (BET) specific surface area (93.9 m2·g-1) and smaller average pore diameter (4.44 nm) than that in air (82.0 m2·g-1, 7.61 nm) . Both Bronsted and Lewis acid sites (mainly Lewis type) are present on the chromia-pillared layered tetratitanate (500℃, N2, 8 h) and strong enough to still remain a small proportion of pyridine upon outgassing at 250℃. Moreover, ammonia temperature-programmmed desorption (NH3-TPD) result showed that there were three NH3 desorption peaks at 160, 200and315℃, resp

英文摘要：

The first chromia-pillared layered tetratitanate was prepared by the reaction of layered tetramethylammonium tetratitanate with chromium (III) acetate [Cr(OAc)3] aqueous solution and subsequent calcination of the resultant solid product in air at 400°C. The obtained chromia-pillared layered tetratitanate has an interlayer distance of 1.06 nm and a high thermal stability up to 600°C. It was also found that calcination in N2 led to the chromia-pillared layered tetratitanate with relatively higher Brunauer-Emmett-Teller (BET) specific surface area (93.9 m2·g?1) and smaller average pore diameter (4.44 nm) than that in air (82.0 m2·g?1, 7.61 nm). Both Br?nsted and Lewis acid sites (mainly Lewis type) are present on the chromia-Pillared layered tetratitanate (500°C, N2, 8 h) and strong enough to still remain a small proportion of pyridine upon outgassing at 250°C. Moreover, ammonia temperature-programmed desorption (NH3-TPD) result showed that there were three NH3 desorption peaks at 160, 200 and 315°C, respectively. The corresponding acid amount is 41.3, 73.9 and 290.7 μmol·g?1. The total acid amount is 405.9 μmol·g?1.