Effect of additives on the growth behavior of silicalite crystal

✍ Scribed by A Iwasaki; T Sano; Y Kiyozumi

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 279 KB
• Volume: 25
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(98)00181-4

✦ Synopsis

The growth behavior of silicalite crystals in synthesis mixtures containing various aluminum contents was investigated by direct observation. It was found that the growth rate in the (001) direction decreased with the addition of aluminum, whereas the growth rates in the ( 100) and ( 010) directions displayed different behavior. Crystals with intergrowths were more frequently observed with an increase in aluminum concentration. The effects of the addition of iron and various organic compounds were also studied. In most cases, the growth rates in the ( 100) and ( 010) directions changed in a similar way. Based on crystal morphology, in particular the aspect ratio, a plausible mechanism for silicalite crystal growth is discussed.