Acetone gas phase condensation on Mg-Al composite oxides catalysts prepared via Mg-Al hydrotalcites precursor

作者：Wang Fang Zhu^*; Yang Kun; Chai Yong Ming; Gao Peng Cheng

来源：Chinese Journal of Inorganic Chemistry, 2008, 24(9): 1417-1423.

• Mg-Al-LDH
• Mg-Al-LDO
• isophorone(IP)
• acetone oligomerization
• solid basic catalysts

The Mg-Al-layered double oxides(Mg-Al-LDO) were prepared at 500 degrees C for 4 h through calcining the Mg-Al-layered double hydroxides (Mg-Al-LDH) from co-precipitation-constant-temperature-crystal method. The samples were characterized by IR, XRD, CO2-TPD, SEM and nitrogen-adsorption/desorption measurements. The acetone vapor-phase condensation reaction on Mg-Al-LDO catalysts were carried on fixed-bed micro-reactor at 250 degrees C and liquid hourly space velocity(LHSV) of 1 h(-1). The results show that the density of weak and strong basic sites on Mg-Al-LDO are dependent on crystallization time of Mg-Al-LDH. The acetone condensation is catalyzed by basic sites and the obtained products are isophorone (IP), mesityl oxide (MO), isomesityl oxide and mesitylene. The catalysis reaction of acetone vapor-phase condensation for IP requires the synergistic effect of weak basic sites(S.) and strong basic sites (S.), and furthermore, the S, must match with S, in this catalysis reaction. The optimum Mg-Al-LDO catalyst is LDO-12 (crystallization time =12 h) and its S-w/S-s raito is 1.3, the selectivity of IP is 65.3%, single-pass-yield of(IP+MO) is 14.8%.

• 出版日期2008-9
• 单位中国石油大学（华东）