Hydrothermal synthesis of laumontite, a zeolite

✍ Scribed by H. Ghobarkar; O. Schäf

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 531 KB
• Volume: 23
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(98)00045-6

✦ Synopsis

Laumontite was synthesized in a wide temperature range (between 30°C and 450°C ) by hydrothermal treatment of artificial glasses of composition 1CaO-1Al 2 O 3 -4SiO 2 at 1 kbar H 2 O pressure. The zeolite was always formed with monoclinic symmetry (C2/m, a=15.02 A ˚, b=13.15 A ˚and c=7.71 A ˚, b=113°). A systematic change of crystal shape with temperature was observed, while other different phases coexisted with laumontite dependent on the temperature range of synthesis. Comparison of the crystal shapes of natural laumontites with the crystal shapes of synthesized laumontites allows predictions regarding the formation temperature of the phase.