硫酸イオン担持酸化物型固体超強酸触媒の調製過程における構成粒子の性状変化(<小特集>粉体小特集)

概要

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SO^<2->_4 ions loaded on the surface of TiO_2 or ZrO_2 act as a promoter to enhance the Lewis acidity of the metal captions up to the strength of super solid acid. The SO^<2->_4 ions act simultaneously as a suppressor of the thermal growth of constituent oxide particles during calcination. The OH groups on the surface without SO^<2->_4 ions are active to the Olation reaction which is 2OH → -O- → + H_2O, and leading to the coagulation and joining of the particles. The replacement of OH group with SO^<2->_4 ion results in a retarding effect against the decrease of surface area and crystallization along with phase transition. The catalytic activity of super solid acid catalysts such as SO^<2->_4 / TiO_2 and SO^<2->_4 / ZrO_2 was found to be controlled by both the number of super solid acid sites and the acid strength.
社団法人日本材料学会の論文
1988-11-15