Preparation and Characterization of Calcium Silicate for CO₂ Sorption

Abstract

An attempt has been made to develop different samples of calcium silicate and to screen these samples for CO 2 sorption and alkalinity in order to achieve maximum CO 2 sorption. The CO 2 sorption capacity of these samples was examined at different temperatures. Various methods such as solid-solid fusion, sol-gel, molten salt and templates (CTAB, cetyltrimethylammonium bromide or Aliquat 336, tricaprylmethylammonium chloride) were used to prepare the calcium silicate samples. The solid mass of calcium silicate samples were obtained by calcining the solid product obtained in an atmosphere of air or helium at 900 °C for 3 hours. The calcium silicate samples were characterized for surface area, alkalinity, scanning electron microscopic images and X-ray diffraction patterns. The temperature profile of CO 2 sorption by calcium silicate was studied in the temperature range of 40-850 °C. Our results showed that the alkalinity and surface area of calcium silicate were in the range from 2.35 to 20 mmol g -1 and 1.4 to 10 m 2 g -1, respectively. The sorption of CO 2 at 500 °C over calcium silicate for the different Ca/Si mol ratio (range: 1-6) was found to be in the range from 3.12 to 29.96 wt%. Addition of a promoter such as sodium, potassium, caesium and lanthanum was found to enhance the sorption of CO 2 by calcium silicate. Several samples of different mol ratios of Ca/Si prepared by different methods were tested for the sorption of CO 2 at 500 °C.

Cyclic performance of CaCO3@mSiO2 for CO2 capture in a calcium looping cycle

“…Essentially, the calcium silicate is one kind of feedstock for accelerated carbonation as well. 31,32 It is suggested that the phase components of the (CaCO 3 @mSiO 2 )based sorbents did not markedly transform aer calcination at 500 C for 0.5 h in air and operating the cyclic decarbonation/ carbonation test aer the ieth cycle.…”

Determination of Mechanical Properties of Epoxy Composite Materials Reinforced with Silicate Nanofillers Using Digital Image Correlation (DIC)

“…The structure of the synthesized silicates, CaSiO 3 , Mg 2 SiO 4 , Ca 2 SiO 4 , and Ca 3 SiO 5 , was confirmed in Figure 4 . Asymmetric stretching of Si-O-Si bonds and their vibrations were suggested by peaks at 1007, 1055, and 982 cm −1 [ 40 ]. The occurrence of peaks at 982, 873, 832, and 611 cm −1 indicates symmetric and asymmetric stretching vibrations of SiO 4 [ 41 ].…”

Synthesis of new Cr2O3/Fe2O3/glass composites from industrial wastes; from undesired to advanced optical products

“…For sintered composite without chromia and hematite addition (CF0), the main formed phases were lead silicate (Pb 2 SiO 4 ), lead oxide (PbO), calcium silicate (Ca 2 SiO 4 ), and silica (SiO 2 ). Calcium silicate was formed as the result of a direct reaction between calcium carbonate and silica that was found in the parent glass waste (Kale et al 2012 ).

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