Topic
Precipitated silica
About: Precipitated silica is a research topic. Over the lifetime, 1401 publications have been published within this topic receiving 20992 citations.
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01 Jan 2015
TL;DR: In this paper, a CO 2 adsorbent has been prepared by impregnating polyethyleneimine (PEI) onto mesoporous precipitated silica, and the adsorption heat calculated ranges from 68−75 kJ/mole of CO 2.
Abstract: In this study, a novel and inexpensive CO 2 adsorbent has been prepared by impregnating polyethyleneimine (PEI) onto mesoporous precipitated silica. The study indicates that the CO 2 adsorption capacity of the prepared adsorbent increases with the increase in PEI loading. The maximum adsorption capacity of adsorbent can be achieved at 75 o C. In pure CO 2 , at 75 o C and 1 bar, adsorbent containing 60% PEI can adsorb 199.6 mg of CO 2 /g. The adsorption capacity of an adsorbent impregnated with 55% PEI (PEI-MPS-55) measured at the heat equilibrium reduced from 128 mg/g to 117 mg/g and 101 mg/g as CO 2 concentration varies from 100 to 15% and 4%, respectively. The adsorption heat calculated ranges from 68─75 kJ/mole of CO 2 . The cyclic adsorption-desorption studies revealed that the adsorbent is relatively stable; the CO 2 loading was not changed after 20 cycles of adsorption/regeneration at 75/90 o C. Keywords : Adsorption capacity; CO 2 capture; Regeneration; Adsorbent; Precipitated silica.
11 citations
Patent•
11 Jul 1972
TL;DR: In this paper, an amorphous, pulverulent, dry silica is prepared which is particularly useful for reinforcing rubber, which is produced by: A. PREPARING SEED PARTICLES by adding a MINERAL ACID to a DILUTE ALKALI METAL SILICATE SOLUTION CONTAINING 1 TO 3% by weight of SiO2 to form a sol having a pH of about 4.5 - 6.
Abstract: An amorphous, pulverulent, dry silica is prepared which is particularly useful for reinforcing rubber. It is produced by: A. PREPARING SEED PARTICLES BY ADDING A MINERAL ACID TO A DILUTE ALKALI METAL SILICATE SOLUTION CONTAINING 1 TO 3% BY WEIGHT OF SiO2 to form a sol having a pH of about 4.5 - 6.5 and allowing the sol to set into a firm aquagel, B. DILUTING AND DISPERSING THE AQUAGEL IN WATER TO FORM AN AQUEOUS DISPERSION OF AQUAGEL SEED PARTICLES, C. MIXING WITH SAID DISPERSION AN ALKALI METAL SILICATE SOLUTION, D. ADDING ACID TO SAID SEED DISPERSION-ALKALI METAL SILICATE MIXTURE AT A TEMPERATURE OF ABOUT 75* - 100* C to quickly lower the pH to about 1 to 4 and precipitate silica, E. SEPARATING THE WET PRECIPITATED SILICA FROM THE ASSOCIATED LIQUID AND DRYING THE FRESHLY PRECIPITATED SILICA.
11 citations
Patent•
28 Oct 2003
TL;DR: In this article, a composite material comprising a boehmite substrate coated with precipitated silica, the composite having a BET specific surface area of from 1 m 2 /g to 50 m 2/g, such that the composite material has a % silica coating parameter value of about 5% to about 50%.
Abstract: Disclosed is a composite material comprising a boehmite substrate coated with a precipitated silica, the composite having a BET specific surface area of from 1 m 2 /g to 50 m 2 /g, such that the composite material has a % silica coating parameter value of about 5% to about 50%. Also disclosed is a dentifrice comprising this composite material. When included in a dentifrice composition, the composite material not only provides excellent abrasive and cleaning performance but also has compatibility with other ingredients used in dentifrice formulations, such as fluoride, flavors and cationic species.
11 citations
TL;DR: In this paper, the average particle size of the powders are in nanometer scale with a narrow size distribution, which is shown to provide nano-sized multicomponent ceramic powders at comparatively low temperatures and offers the potential of being a simple and cost-effective route.
11 citations
Patent•
27 Apr 1989TL;DR: Precipitated silica is characterised in this paper as having a methanol value higher than 20, preferably higher than 25, a luminance Y higher than 84, a BET specific surface higher than 50 m /g, a mean particle size of between 0.1 and 20 microns and in that it is treated with a mixture of hexamethylcyclotrisiloxane (D3) and octamethyl-cyclotetrasiloxide (D4) in the absence of tin compound.
Abstract: Precipitated silica characterised in that it has a methanol value higher than 20, preferably higher than 25, a luminance Y higher than 84, a BET specific surface higher than 50 m /g, a mean particle size of between 0.1 and 20 microns and in that it is treated with a mixture of hexamethylcyclotrisiloxane (D3) and octamethylcyclotetrasiloxane (D4) in the absence of tin compound. Compositions for EVC containing such silicas and elastomers (vulcanisates) obtained with these compositions.
11 citations