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CO2 CAPTURE WITH HYDROTALCITES OF MGAL-CO3 AND ORGANOHYDROTALCITES FOR APPLICATION AS SINK URBAN GREENHOUSE GAS
David Suescum-Morales, David Cantador-Fernández, José Ramón Jiménez, José María Fernández
Keywords: Capture CO2, Hydrotalcite, Adsorption, Climate change. 1. Introduction
There is currently great concern at the international level regarding the emission of greenhouse gases (GHG) of anthropogenic origin and their environmental impact. The rate of growth of these emissions and the potential danger to which we expose ourselves has led society to consider how to address this problem. CO2 emissions grew in 2017 by 460 million tons more than in the previous year, reaching a historical peak of 32.5 Gt. This growth in emissions has been the result of a growth in the economy, a drop in the price of fuels, and lower efforts in energy efficiency (IEA, 2017). According to the Kyoto Protocol, CO2 is identified as the main responsible component of climate change and global warming (Montzka, Dlugokencky, & Butler, 2011). With this research we want to check the CO2 capture capacity of two hydrotalcite families of MgAlCO3 (one synthesized in the laboratory and another commercial); and of two types of organohydrotalcites (OHTs), one with anion dodecisulfato (HT-DDS) interspersed and another with tetradecanodiato (HT-TDD), both prepared by the method of coprecipitation. The hydrotalcites, organohydrotalcites and those calcined at 500 ° C have been previously characterized.
2. Materials and methods
The physical and chemical characterization of both hydrotalcites and organohydrotalcites has been carried out by means of X-ray diffraction (XRD), thermogravimetric analysis (ATD-TG), particle size, transmission and scanning electron microscopy, as well as the realization of BET isotherms to study the Surface
To measure the CO2 adsorption capacity of both hydrotalcites and organohydrotalcites, a "Sieverts type" adsorption analyzer has been used, making it possible to perform isotherms at different temperatures, using CO2 as adsorbent (see figure 1).
Figure 1. Diagram of equipment type Sieverts and PCTPro2000.
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