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Microporous Glass‐Ceramics in NASICON‐Type Copper(II) Titanium Phosphate
Author(s) -
Yamamoto Kousuke,
Abe Yoshihiro
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02609.x
Subject(s) - materials science , ceramic , titanium , copper , microporous material , crystallization , fast ion conductor , porous glass , glass ceramic , chemical engineering , porosity , mineralogy , composite material , metallurgy , electrolyte , chemistry , electrode , engineering
A novel porous glass‐ceramic with a skeleton of a NASICON‐type copper(II) titanium phosphate was prepared via the controlled crystallization of a glass and the subsequent chemical leaching of the resulting dense glass‐ceramic. A volume‐crystallized dense glass‐ceramic comprised of CuTi 2 (PO 4 ) 3 and Cu 3 (PO 4 ) 2 , whose surface was covered by a thin layer of CuO, was prepared by reheating a glass with a nominal composition of 50CuO20TiO 2 30P 2 O 5 (in mol%) in air. When the resulting glass‐ceramic was leached with dilute HCl, the Cu 3 (PO 4 ) 2 and CuO phases were dissolved out selectively, and a cuprous NASICON crystal of CuTi 2 (PO 4 ) 3 was converted to its cupric type, CuTi 4 (PO 4 ) 6 , which was left as a skeleton of the porous materials. The specific surface area and the average pore radius of the porous glass‐ceramic obtained were ∼70 m 2 /g and ∼7 nm, respectively. The porous glass‐ceramic showed high catalytic activities for the dehydration of 2‐propanol.