Abstract
Preparation procedure of Sn-incorporated in meso pores of MCM-41 has been studied for reduction of acetophenone to 1-phenylethanol. Tin was incorporated into the meso pores of MCM-41 by a template ion exchange (TIE in the following) method. Almost 20 wt% of Sn was loaded in the meso pores and ca. 70 % of template was still remained together. Calcination treatment to remove the residual template ions brought about significant collapse of the periodical hexagonal structure of MCM-41 and decrease of surface area because of heat of combustion of the template in the pores accompanying with sintering of incorporated tin. We have investigated the procedure to remove the template from the MCM-41 by rinsing with HCl before or after the tin incorporation to avoid vigorous exothermic combustion during the calcination. Almost 70-80 % of template was liberated by the rinse with HCl. The hexagonal structure and surface area were maintained after Sn incorporation. The rinse with HCl aqueous solution before the tin incorporation brought about an enhancement of specific activity, formation rate of 1-phenylethanol from acetophenone per incorporated amount of Sn. The rinse of HCl before the incorporation increased the specific activity by a factor of 2-3.
