Indoor air cleaning systems that incorporate CO₂ sorbent materials enable HVAC load shifting and efficiency improvements. This study developed a bench‐scale experimental system to evaluate the performance of a sorbent under controlled operation conditions. A thermostatic holder containing 3.15 g sorbent was connected to a manifold that delivered CO₂‐enriched air at a known temperature and relative humidity (RH). The air stream was also enriched with 0.8‐2.1 ppm formaldehyde. The CO₂ concentration was monitored in real‐time upstream and downstream of the sorbent, and integrated formaldehyde samples were collected at different times using DNPH‐coated silica cartridges. Sorbent regeneration was carried out by circulating clean air in countercurrent. Almost 200 loading/regeneration cycles were performed in the span of 17 months, from which 104 were carried out at reference test conditions defined by loading with air at 25°C, 38% RH, and 1000 ppm CO₂, and regenerating with air at 80°C, 3% RH and 400 ppm CO₂. The working capacity decreased slightly from 43‐44 mg CO₂ per g sorbent to 39‐40 mg per g over the 17 months. The capacity increased with lower loading temperature (in the range 15‐35°C) and higher regeneration temperature, between 40 and 80°C. The CO₂ capacity was not sensitive to the moisture content in the range 6‐9 g/m³, and decreased slightly when dry air was used. Loading isothermal breakthrough curves were fitted to three simple adsorption models, verifying that pseudo‐first‐order kinetics appropriately describes the adsorption process. The model predicted that equilibrium capacities decreased with increasing temperature from 15 to 35°C, while adsorption rate constants slightly increased. The formaldehyde adsorption efficiency was 80%‐99% in different cycles, corresponding to an average capacity of 86 ± 36 µg/g. Formaldehyde was not quantitatively released during regeneration, but its accumulation on the sorbent did not affect CO₂ adsorption.

中文翻译：

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用于室内空气清洁应用的CO2吸附剂的性能：环境条件，吸附剂老化和共生甲醛吸附的影响。

包含CO ₂吸附剂材料的室内空气净化系统可实现HVAC负载转移和效率提高。这项研究开发了一个台式规模的实验系统，以评估吸附剂在受控操作条件下的性能。将装有3.15 g吸附剂的恒温器支架连接到歧管，该歧管在已知的温度和相对湿度（RH）下输送富含CO _2的空气。空气流中还富含0.8-2.1 ppm的甲醛。一氧化碳₂实时监测吸附剂上游和下游的浓度，并使用DNPH涂层硅胶滤芯在不同时间收集整合的甲醛样品。通过逆流循环清洁空气进行吸附剂再生。在17个月的时间里执行了近200次加载/再生循环，其中104次是在参考测试条件下进行的，参考条件是通过在25°C，38％RH和1000 ppm CO _2的空气中加载，然后在70 80°C，3％RH和400 ppm CO ₂。工作能力从43-44 mg CO ₂略有下降每克吸附剂在17个月内达到每克39-40毫克。负载温度较低时（在15-35°C范围内），再生温度较高时（在40至80°C之间），容量会增加。CO ₂容量对6-9 g / m ³范围内的水分不敏感，使用干燥空气时略有下降。将加载的等温穿透曲线拟合到三个简单的吸附模型，验证伪一阶动力学恰当地描述了吸附过程。该模型预测，当温度从15升高到35°C时，平衡容量会降低，而吸附速率常数则略有增加。在不同的循环中，甲醛的吸附效率为80％-99％，对应的平均容量为86±36 µg / g。甲醛在再生过程中并未定量释放，但其在吸附剂上的积累不会影响CO _2的吸附。