Kaolin as a Source of Silica and Alumina For Synthesis of Zeolite Y and Amorphous Silica Alumina

Abstract

Kaolin is the clay mineral which containing silica (SiO2) and alumina (Al2O3) in a high percentage, that can be used as a nutrient in the synthesis of zeolites and amorphous silica alumina (ASA). The objective of this research is to convert the Belitung kaolin into silica and alumina as nutrients for the synthesis of zeolites and amorphous silica alumina, which are required in the preparation of the catalysts. Silica and alumina contained in the kaolin were separated by leaching the active kaolin called as metakaolin, using HCL solution, giving a solid phase rich silica and a liquid phase rich alumina. The solid phase rich silica was synthesized to zeolite Y by adding seed of the Y Lynde type, through the hydrothermal process with an alkaline condition. While, the liquid phase rich alumina was converted into an amorphous silica alumina through a co precipitation method. Characterization of zeolite and ASA were done using XRD, surface area and pore analyzer and SEM. The higher of alumina in liquid phase as a result of the rising molar of HCL in the leaching process was observed, but it didn’t work for its rising time. Products of ASA and zeolite Y were obtained by using liquid phase rich alumina and solid phase rich silica, respectively, which resulted through leaching metakaolin in 2.5 M HCl at temperature of 100° C for 2 hours.

The effect of the process condition on synthesis amorphous silica alumina from metakaolin on pore structure and crystallinity of product

“…The ASA results are almost the same as the results obtained by C. Song (2002) that using Al2O3 solution above 40 g/L. As a comparison, Rahayu [8] produces a pore structure of ASA with a lower surface area of 372 m 2 /g, when using a base chemical of NaOH, a higher neutralization temperature and an aging temperature of 65 o C and 60 o C, respectively. Therefore, in this study was used ammonia solution as a base chemical, which has proven its superiority to get a better pore structure, in addition to being supported by a lower process temperature.…”

Green and low-cost synthesis of zeolites from kaolin: a promising technology or a delusion?

“…The chemical formula of kaolinite is Al 2 Si 2 O 5 (OH) 4 . 19,20 It consists of gibbsite-like octahedral plates and siloxane tetrahedral plates stacked alternately. Adjacent layers are linked by hydrogen bonds between apical oxygen atoms and hydroxyl groups of the gibbsite-like layer (Fig.…”

Adsorption of Indigo Carmine Dye and Copper Ion by Kaolin from Bangka Island

“…Kaolinite's structure is a layered silicate mineral with a tetrahedral silica layer (SiO 4 ) through oxygen atoms bonded to an octahedral layer of alumina (AlO 6 ). Kaolin has chemical and physical properties, making it useful in several applications, such as coating and filling paper, plastics, catalysis (E. S. Rahayu et al, 2018), rubber, ink, ceramics, insecticides, etc. and numerous other uses.…”

“…Metakaolin is an essential ingredient in the most concrete mixture. Another silica-alumina mineral syntheses such as zeolite (Rahayu et al, 2014), amorphous silica alumina (E. S. Rahayu et al, 2018), mesoporous silica (Shu et al, 2016b), or nanocomposite silica (Asriza et al, 2020) can be done by using Kaolin or metakaolin.…”