Preparation of Aerogel-Supported Copper Oxide for the Methane Chemical Looping Combustion (CLC) Process

Abstract

The objective of this research is to investigate the effect of different aerogel supports on the stability of copper oxide during limited cycles of CH 4 chemical looping combustion (CLC) in a thermogravimetric analyzer (TGA). Supports proved to be significantly effective not only for the fuel utilization efficiency of CLC but also for the stability of the oxygen carrier (OC). The evaluation tests were performed by employing CuO/aerogel (zirconia, alumina, and silica) OCs synthesized utilizing a novel patented method. The results showed that the OC prepared using zirconia aerogel support had the highest activity over a medium-temperature range (550−800 °C). The OCs were characterized using different methods, including surface area and pore analysis, TGA, X-ray diffraction (XRD), scanning electron microscope (SEM), and dynamic light scattering analysis. The results demonstrated that the proper support can stabilize Cu dispersion, intensify the redox degree of OCs at high temperatures, and strengthen the distribution of Cu on the surface of the support.

Carbon Dioxide Capture and Hydrogen Production with a Chemical Looping Concept: A Review on Oxygen Carrier and Reactor

“…The larger surface area of the support material leads to better distribution uniformity of Fe 2 O 3 , and the OCs modified by SiO 2 have higher CH 4 conversion and redox stability than Fe 2 O 3 /Al 2 O 3 . Daneshmand-Jahromi et al 115 synthesized ZrO 2 , SiO 2 , and Al 2 O 3 aerogel-supported CuO oxygen carriers. It is concluded that OCs prepared with ZrO 2 as the support have the best redox activity.…”

Ambient and sub-ambient temperature direct air CO2 capture (DAC) by novel supported in situ polymerized amines

“…These solutions include reducing our reliance on fossil fuels, transitioning to green and renewable energy sources, and minimizing CO 2 point source emissions through methods such as chemical looping, oxy-combustion, amine absorption, or other CO 2 capture techniques before its release into the atmosphere. [9][10][11][12][13][14][15][16] However, it's important to note that these strategies primarily have the potential to slow the rate of increase of CO 2 in the atmosphere, as they may not fully address non-point sources of CO 2 emissions. 17,18 To address the challenge of increasing CO 2 concentrations and work towards achieving the goal of limiting the increase in Earth's average temperature to 1.5 °C or 2 °C by 2100, an alternative approach involves the use of negative emissions technologies (NETs).…”

“…These solutions include reducing our reliance on fossil fuels, transitioning to green and renewable energy sources, and minimizing CO 2 point source emissions through methods such as chemical looping, oxy-combustion, amine absorption, or other CO 2 capture techniques before its release into the atmosphere. 9–16 However, it's important to note that these strategies primarily have the potential to slow the rate of increase of CO 2 in the atmosphere, as they may not fully address non-point sources of CO 2 emissions. 17,18…”

Amine Sorbents for Sustainable Direct Air Capture: Long-Term Stability and Extended Aging Study

“…Various mitigation solutions have been proposed to address global warming and reduce CO 2 emissions, including diminishing reliance on fossil fuels as energy sources, incorporating renewable energies, and employing conventional point-source CO 2 capture from large stationary facilities like refineries, steel or iron industries, cement plants, and fossil fuel power stations, utilizing precombustion, postcombustion, or oxy-fuel combustion methods. − However, these measures fall short of meeting the current objective to limit the global increase in Earth’s average temperature to 1.5 °C by the end of the century, as outlined in the Intergovernmental Panel on Climate Change (IPCC) report. , These solutions primarily reduce the rate of CO 2 concentration increase, while billions of tons of CO 2 continue to be released annually. − This ongoing increase is associated with nonpoint sources that conventional technologies cannot effectively mitigate. To address nonpoint emissions, Negative Emission Technologies (NETs) come into play, targeting the direct removal of CO 2 from the air. , NETs include coastal blue carbon, terrestrial carbon removal and sequestration, bioenergy with carbon capture and sequestration, carbon mineralization, and direct air capture (DAC). , DAC, a cutting-edge NET, has garnered significant attention for its potential to reverse CO 2 emissions.…”