Calcium oxide based high-temperature carbon dioxide adsorbent material doped with inert component and preparation method

Abstract

The invention discloses a calcium oxide based high-temperature carbon dioxide adsorbent material doped with an inert component and a preparation method. The inert component is cerium oxide, and an active component for adsorbing carbon dioxide is calcium oxide. A calcium oxide based adsorbent is prepared with a sol-gel method, and cerium nitrate and calcium nitrate are precursors; citric acid is introduced, the mixture is sufficiently complexed in a water bath process, and calcium and cerium are uniformly dispersed; a large amount of gas is generated in a roasting process, and loose and porous morphology is formed. The material has the characteristics of excellent stability, high adsorption capacity, high molar conversion of calcium oxide and high adsorption rate when adsorbing carbon dioxide at the high temperature; the preparation process is simple, the cost is low, and the requirement for the preparation is lower; the adsorbent has a wider industrial application prospect when used for adsorbing carbon dioxide at the high temperature.

Description

technical field [0001] The invention belongs to a calcium oxide-based high-temperature carbon dioxide adsorption material doped with inert components and a preparation method thereof. Background technique [0002] Excessive emissions of the greenhouse gas carbon dioxide may be the main cause of global warming, which is mainly caused by the burning of fossil fuels used in power plants and transportation industries. In addition, due to the low cost of fossil fuels, global carbon dioxide emissions are expected to further increase, so the capture of carbon dioxide has become a research hotspot. The use of solid adsorbents to adsorb carbon dioxide is an effective way to deal with carbon dioxide. Adsorbents can be divided into low-temperature adsorbents (<200°C), medium-temperature adsorbents (200-400°C) and high-temperature adsorbents (> 400°C), calcium oxide, as a typical high-temperature solid adsorbent, has great potential application value in the treatment of high-temp...

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Problems solved by technology

[0004] Many methods have been reported to improve the cycle stability of adsorbents, high temperature heat treatment (Energy Fuels, 2009, 23 (3): 1437-1444), hydration treatment (Energy Fuels, 2011, 25 (3): 1294-1301 ), ethanol solution modification (AIChE Journal, 2013, 59 (10): 3586-3593), preparation of nano calcium oxide (Environmental Science Technology, 2010, 44 (8): 3093-3097), doping inert components ( Journal of Physical Chemistry C, 2011, 115: 24804-24812), etc., each of the above methods has its own advantages and disadvantages, and the high-temperature heat treatment requires high energy consumption, which increases the cost; the general method of modifying or preparing nanomaterials is complex and difficult to operate. The cost is high, which is not conducive to the industrial production of adsorbents; the preparation method of doping with inert components is relatively simple, easy to operate, and has a good effect on improving stability

However, when the inert components are too much doped, the adsorption capacity will decrease, which is also unfavorable for the adsorption process. Therefore, the calcium oxide-based adsorbent suitable for industrial production is developed through the doping method, so that it has a higher adsorption capacity and a higher adsorption capacity at the same time. Good stability is an important content of current research

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