Synthesis method and application of nanometer SiO2/CaO adsorbent

Abstract

The invention relates to a synthesis method of a nanometer SiO2/CaO adsorbent. Calcium carbonate and nanometer SiO2 are subjected to ball mining, crushing and sieving; the specific surface area of the nanometer SiO2 is greater than 200m<2>/g, and the nanometer SiO2 includes but is not limited to precipitation method nanometer SiO2, vapor phase method nanometer SiO2, ZSM-5 molecular sieves, MCM-41 molecular sieves, MCM-48 molecular sieves, MCM-50 molecular sieves and SBA-15 molecular sieves; the calcium carbonate (through being metered by CaO mass) and the nanometer SiO2 are weighed and are subjected to solid phase mixing according to a mass ratio of (80:20) to (95:5); the mixture is calcined for 2 to 6h at 850 to 950 DEG C in inert gas atmosphere; after cooling, an adsorbent product is obtained; when the adsorbent product is used for a circulating fluidized bed, the fast CO2 gathering and the adsorbent regeneration can be realized. The method has the advantages that a solid phase mixing technology is used; a liquid phase reaction process with high energy consumption and high cost is avoided; the product adsorption speed is high; the adsorption quantity proportion can reach 85 percent or higher at a 20s fast adsorption stage; the high-temperature stability is high; the circulation adsorption capacity is great; the adsorption capacity can still reach 0.30g CO2/g of the adsorbent after 30 circulations; the method is suitable for the realization of mass application in the circulating fluidized bed.

Description

technical field [0001] The present invention belongs to industrial source CO 2 Capture and material synthesis technical field, especially related to a kind of nano-SiO 2 / Synthetic method of CaO adsorbent and its application to fast CO 2 capture application. Background technique [0002] A large amount of human energy consumption and industrial emissions cause greenhouse gases (CO 2 、CH 4 , N 2 O and CFCs, etc.) concentrations surge, causing a series of changes such as global warming and sea level rise. According to the public data of the World Bank, global greenhouse gas emissions have been increasing year by year, and the total emissions in 1970, 1980, 1990, 2000 and 2012 were 270.75, 328.34, 374.62, 396.53 and 52.763 billion tons (in terms of CO 2 equivalent meter). Among them, the 2012 global CO 2 The total emission is 35.464 billion tons, accounting for 67.21% of the total greenhouse gas emissions, and it is the most important greenhouse gas. In order to allevi...

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Problems solved by technology

[0006] In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of nano-SiO 2 / Synthetic method of CaO adsorbent and its application to rapid CO 2 The application of capture, based on the solid-phase mixing technology route, can improve material performance, reduce production costs, and realize CO2 in industrial source flue gas 2 The large-scale application of fast capture finally solves the problems of poor cycle stability of natural calcium-based adsorbents, slow adsorption rate of synthetic calcium-based adsorbents and complex production processes.

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