The control of anthropogenic CO₂ emissions has attracted worldwide attention because of global warming. Among diverse carbon capture technologies, calcium looping (CaL) is proposed as a favorable approach for postcombustion CO₂ mitigation. However, the sorbents’ capacitive loss with increased CaL cycling has severely limited the efficient application of the method. Therefore, obtaining sintering-resistant Ca-based sorbents with high capture capacity, fast capture kinetics, and superior stability is considered a research priority. Here, we reported our latest work on the development of a novel Y₂O₃/M_xO_y-modified Ca-based sorbent with superior CO₂ sorption performance. Y20/Mg20, i.e., synthetic Ca-based sorbents with Y and Mg incorporated at the mass ratio of 1:1, achieved a significantly high conversion (above 90%) in 20 CaL cycles at a typical calcination temperature (∼900 °C) and was stabilized at the CO₂ uptake of 0.311 g of CO₂/g of sorbent even after 122 CaL cycles. A comprehensive investigation revealed that the outstanding performance arose from the characteristics of (1) superior surface area and pore volume, provided by pores with radii of <20 nm, (2) a gradually formed skeleton-type structure, and (3) a porous internal structure with a homogeneous distribution of Y₂O₃ and MgO nanoparticles.

中文翻译：

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Y ₂ O ₃ / M _x O _y掺钙钙基吸附剂在高温下高效稳定地捕获CO _2的研究

由于全球变暖，对人为CO ₂排放的控制引起了全世界的关注。在多种碳捕集技术中，提出了钙环化（CaL）作为缓解燃烧后CO ₂的有利方法。但是，随着CaL循环次数的增加，吸附剂的电容损失严重限制了该方法的有效应用。因此，获得具有高捕获能力，快速捕获动力学和优异稳定性的抗烧结钙基吸附剂被认为是研究的重点。在这里，我们报告了我们在开发新型Y ₂ O ₃ / M _x O _y改性的具有优异CO _2的Ca基吸附剂方面的最新工作。吸附性能。Y20 / Mg20，即以1：1的质量比掺入Y和Mg的合成Ca基吸附剂，在典型的煅烧温度（〜900°C）下，通过20 CaL循环实现了很高的转化率（超过90％）。并且即使在122 CaL循环后，也稳定在0.311 g CO ₂ / g吸附剂的CO ₂吸收量上。全面的研究表明，出色的性能源于以下特性：（1）半径小于20 nm的孔提供了出色的表面积和孔体积；（2）逐渐形成的骨架型结构；（3）多孔结构内部结构具有均匀分布的Y ₂ O ₃和MgO纳米颗粒。