Preparation of Porous Glass‐Ceramics with a Skeleton of NASICON‐Type Crystal CuTi 2 (PO 4 ) 3

A novel porous glass‐ceramic with a skeleton of CuTi 2 (PO 4 ) 3 was prepared by controlled crystallization of a glass and subsequent chemical leaching of the resulting dense glass‐ceramic. A volume‐crystallized dense glass‐ceramic composed of CuTi 2 (PO 4 ) 3 and Cu 3 (PO 4 ) 2 whose surface was covered by a CuO thin layer was prepared by reheating a glass with a nominal composition of 50CuO·20TiO 2 30P 2 O 5 (in mol%) glass in air. When the resultant glass‐ceramic was leached with dilute H 2 SO 4 , Cu 3 (PO 4 ) 2 and CuO phases were dissolved out selectively, leaving a crystalline CuTi 2 (PO 4 ) 3 skeleton. The specific surface area and the average pore radius of the porous glass‐ceramic obtained were approximately 45 m 2 g ‐1 and 9 nm, respectively. The porous glass‐ceramic showed catalytic activity in the conversion reaction of propene into acrolein.