Synthesis of acrylic-modified sol–gel silica

Review on the physicochemical treatments of rice husk for production of advanced materials

“…Various methods have been reported in the literatures for preparing silica materials, such as plasma synthesis [107], chemical vapor deposition [108], sol-gel processing [109], microemulsion processing [110], combustion synthesis [111] and hydrothermal technique [112].The traditional industrial method of preparing silica is that sodium carbonate powder reacts with quartz sand at high temperature to form sodium silicate, and then the obtained sodium silicate reacts with sulfuric acid in order to precipitate silica.This method was hazardous to the environment because of production of 0.23 toncarbon dioxide (CO 2 ), 0.74 ton sodium sulfate and 20 tons waste water during the preparation of 1 ton of silica by using 0.51 ton of sulfuric acid and 0.53 ton of sodium carbonate. In recent years, one of the world's primary concerns is the "greenhouse" effect, especially relating with CO 2 [113].…”

Enhanced activity of CuFe/SiO2 catalyst for CO hydrogenation to higher alcohols by pretreating the support with ammonia

“…Those at 804 cm À1 and 1100 cm À1 correspond to symmetric and asymmetric Si-O-Si stretching vibration, respectively. The absorption band at 1633 cm À1 is assigned to representative of absorbed water (H-O-H bending vibration) [29]. From Fig.…”

Synthesis of silica powders by pressured carbonation

“…Various methods have been reported for preparing silica materials, such as plasma synthesis [11], chemical vapor deposition [12], sol-gel processing [13,14], microemulsion processing [15], combustion synthesis [16,17] and hydrothermal technique.…”