Supporting or shaping a porous powder is important for industrial applications as optimized structure with high mass transfer, low pressure drop and high mechanical and chemical stability can be obtained. A new class of geopolymer-hydrotalcite composites with suitable mechanical and thermal properties were conceived as shaped materials for CO adsorption applications at intermediate temperature (200–400 °C). Composite monoliths were produced mixing different commercial hydrotalcite-type (HyT) powders with a metakaolin-based geopolymer matrix with a molar ratio SiO:AlO = 4.0. The compressive strength at room temperature and 500 °C ranged between 10 and 35 MPa, mainly depending on HyT powder morphology and composite total porosity. The composites were characterized and tested in term of CO uptake. After calcination to convert HyT into an amorphous Mg:Al mixed solid oxide able to absorb CO, the composites were tested in the CO adsorption at 200 °C, with cycles of adsorption/desorption performed with intermediate regeneration at 500 °C. CO adsorption capacity was in the range 0.375–0.461 mmol g for HyT and between 0.109 and 0.145 mmol g for composites, being 0.052 mmol g the value for the geopolymer matrix. A partial deactivation of the HyT phases was also detected.

中文翻译：

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用于二氧化碳捕获的地质聚合物-水滑石复合材料


支撑或成型多孔粉末对于工业应用非常重要，因为可以获得具有高传质、低压降和高机械和化学稳定性的优化结构。具有合适机械和热性能的新型地质聚合物-水滑石复合材料被认为是用于中温（200-400°C）CO 吸附应用的成型材料。将不同的商用水滑石型 (HyT) 粉末与摩尔比 SiO:Al2O = 4.0 的偏高岭土基地质聚合物基质混合制成复合材料整体。室温和500℃下的压缩强度在10至35MPa之间，主要取决于HyT粉末形态和复合材料总孔隙率。对复合材料的 CO 吸收量进行了表征和测试。经过煅烧将 HyT 转化为能够吸收 CO 的无定形 Mg:Al 混合固体氧化物后，复合材料在 200 °C 下进行 CO 吸附测试，并在 500 °C 下进行吸附/解吸循环和中间再生。 HyT 的 CO 吸附能力范围为 0.375–0.461 mmol g，复合材料的 CO 吸附能力范围为 0.109 至 0.145 mmol g，地质聚合物基体的 CO 吸附能力为 0.052 mmol g。还检测到 HyT 相部分失活。