化学链制化学品工艺及循环材料研究进展

Chemical looping technology demonstrates significant potential for enhancing chemical production processes compared to traditional processes, resulting in increased exergy efficiency and reduced carbon emissions. This review focuses on common chemical looping processes for chemical production, including chemical looping reforming/partial oxidation (CLR/CLPO) of methane for syngas and hydrogen production, light alkanes chemical looping oxidative dehydrogenation (CL-ODH) or chemical looping selective hydrogen combustion (CL-SHC) for olefin production, chemical looping oxidation coupling of methane (CL-OCM) for ethylene production, chemical looping dehydrogenation aromatization (CL-DHA) of methane for benzene production, and chemical looping selective oxidation (CL-SO) for oxygen-containing organic compound production (such as methanol, ethylene oxide, and formic acid). A fundamental understanding of the structure-activity relationship between the textual properties of oxygen carriers and chemical looping reaction performance is paramount for achieving the rational design of oxygen carriers. At present, we have a solid theoretical foundation in the design of oxygen carriers. We use the thermodynamic equilibrium oxygen partial pressure of oxides to screen the active components of oxygen carriers, and from controlling the lattice oxygen release kinetics based on surface engineering strategies to in-depth analysis of oxygen carrier performance enhancement strategies through the rational construction of structural and electronic descriptors. Experimental and density functional theory (DFT) computational data-driven interpretable machine learning (ML) can enable high-throughput screening of oxygen carriers, which greatly broadens the screening range and reduces the cost of experiment time. With the development of chemical looping technology, the concept of oxygen carrier can be further extended to looping material (LM), such as nitrogen and chloride carriers. Photo/electro-driven chemical looping processes provide new routes to synthesize high-value-added products at low temperatures or even room temperatures, thereby broadening the application scope of chemical looping technology. Additionally, chemical looping technology can be applied to enhance the separation process of binary azeotropic organic mixtures, which is of great significance for developing low-cost, low-pollution, and low-emission separation processes.