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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Relating Structural and Microstructural Evolution to the Reactivity of Cellulose and Lignin during Alkaline Thermal Treatment with Ca(OH)(2) for Sustainable Energy Production Integrated with CO2 Capture
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Relating Structural and Microstructural Evolution to the Reactivity of Cellulose and Lignin during Alkaline Thermal Treatment with Ca(OH)(2) for Sustainable Energy Production Integrated with CO2 Capture

机译：将结构和微观结构进化与Ca（OH）（2）碱热处理期间碱热处理期间的结构和微观结构进化与CA2（OH）（2）进行了与CO2捕获相结合的可持续能源

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The transition toward a low carbon economy necessitates the implementation of a wide range of negative emissions technologies, including bioenergy integrated with CO2 capture and storage. Advancing large-scale or modular technologies for bioenergy with carbon capture and storage requires a fundamental understanding of chemo-morphological coupling in these material systems. In this context, integrated chemical pathways such as alkaline thermal treatment (ATT) of biomass which involves the production of bio-H-2 while converting and storing CO2 as solid carbonates provides promising potential for integrating bioenergy with carbon capture and storage. In this study, we elucidate the structural and morphological changes when biomass feedstocks such as cellulose and lignin are reacted with calcium hydroxide to capture, convert, and store CO2 as calcium carbonate while producing energy carrier such as H-2. These structural and morphological changes were monitored using synchrotron based in operando multiscale X-ray scattering measurements. Enhanced CO2 capture at temperatures above 375 degrees C was evident from the significant growth of the calcium carbonate phase at these conditions. Increase in the surface area and porosity of cellulose was noted compared to lignin due to the relatively fast decomposition of cellulose. Pore-solid interfaces in Ca(OH)(2) + cellulose system became smoother in the temperature range of 500-700 degrees C compared to Ca(OH)(2) + lignin system, where the interfaces became rougher. Enhanced roughness of the pore-solid interfaces in the presence of lignin is attributed to the simultaneous slow decomposition of lignin and formation of calcium carbonate.
机译：朝向低碳经济的过渡需要实施广泛的负排放技术，包括与二氧化碳捕获和储存集成的生物能量。通过碳捕获和存储促进对生物能量的大规模或模块化技术需要对这些材料系统中的化学形态偶联的基本理解。在这种情况下，综合化学途径，例如生物量的碱性热处理（ATT），其涉及在转化和储存CO 2的同时生产Bio-H-2作为固体碳酸盐的含量提供了与碳捕获和储存的生物能量集成生物能量的有希望的电位。在这项研究中，当纤维素和木质素如纤维素和氢氧化钙反应以捕获，转化和储存CO 2时，阐明结构和形态学的变化，同时产生碳酸钙，同时生产碳酸钙，例如H-2。使用基于Operando MultiScale X射线散射测量的同步rotron监测这些结构和形态学。在这些条件下，从碳酸钙相的显着生长中，增强的CO 2捕获在375℃以上的温度下显而易见。由于纤维素的相对快速分解，将引起纤维素的表面积和纤维素的孔隙率的增加。与Ca（OH）（2）+木质素系统相比，Ca（OH）（2）（2）（2）+纤维素系统中的孔固体嵌段在500-700摄氏度的温度范围内变得更加光滑。在木质素存在下，增强孔隙固体界面的粗糙度归因于木质素同时分解和碳酸钙的形成。

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