Improvement on CO 2 capture by CaO pellet modified with carbon nanotubes
- PDF / 1,082,601 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 100 Downloads / 225 Views
ORIGINAL ARTICLE
Improvement on CO2 capture by CaO pellet modified with carbon nanotubes Henrique S. Oliveira1,3 · Laura M. Araújo1 · Plínio C. C. Pinto1 · Geison V. Pereira1 · Patricia P. de Souza2 · Jadson C. Belchior1 · Luiz C. A. Oliveira1 Received: 18 December 2019 / Accepted: 28 May 2020 © Islamic Azad University 2020
Abstract In this work, we developed an efficient absorbent material pellet-based made of calcium oxide to capture part of the C O2 emitted by motor vehicles, to obtain an innovative technology for controlling the emission of greenhouse gases. Problems with CO2 capture efficiency using CaO was solved after modifications with carbon nanotubes (CNTs) that improve CaO adsorbent porosity leading high CO2 capture efficiency (98.2%). The CO2 gas adsorption by pellet was followed by thermogravimetric analysis showed that porosity generated promoted a better CO2 adsorption compared to unmodified CaO (64.1%). The results strongly suggest that the preparation of CaO pellet-based in the presence of a small amount of nanotubes (0.05%), followed by calcination, promotes the formation of channels that allow to substantially improve C O2 capture capacity by increasing the exposing adsorbent calcium species. This effect may be due to the crystallite size of the materials. The calcium oxide, after modification with carbon nanotubes, showed particle size values of 25 and 17 nm, respectively, before and after calcination. Graphic abstract
Keywords CO2 capture · Calcium oxide · Carbon nanotubes · Greenhouse gas · TG
Extended author information available on the last page of the article
13
Vol.:(0123456789)
International Nano Letters
Introduction The Intergovernmental Panel on Climate Change (IPCC) has promoted the adoption of a technology called carbon capture and storage (Carbon Capture and Storage—CCS) as a way of reducing C O2 emissions. The CCS is composed of three steps (i) separation of CO2 from gas mixtures (CO2 capture), (ii) CO2 compression and transport and (iii) C O2 storage. The CO2 capture step is the most expensive, corresponding to approximately 75% of the total CCS cost. Therefore, much research has been conducted to improve the effectiveness of this high cost demand and, as result, procedures to reduce the overall CCS cost [1]. The most efficient processes for capture exhaust gas from gasoline engines (Otto cycle) are the chemical absorption technologies. Several studies have reported the importance of capture and regeneration of absorption systems. For example, the development and application of technologies in studies at different gas exhaust temperatures in vehicle motors has shown in NOx absorption and NOx reduction by around 200–400 °C with Pt/BaO/Al2O3. The latter particular approach is a more realistic system and could be a path for a study with direct application [2]. The most widely adopted commercial method in the processing of natural gas and hydrogen uses aqueous amine solutions: monoethanolamine and methyldiethanolamine [3, 4]. The amine solution has show
Data Loading...
