火星富CO2大气环境下NaY沸石吸附分子污染物机制研究
doi: 10.11728/cjss2025.02.2024-0161 cstr: 32142.14.cjss.2024-0161
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冯爱虎 男, 出生于1991年, 工学博士, 副研究员/硕士生导师, 研究方向为航天器特种无机功能涂层. E-mail: fengaihu@mail.sic.ac.cn -
于云 女, 出生于1967年, 工学博士, 研究员/博士生导师, 研究方向为航天器特种无机涂层与热防护材料. E-mail: yunyush@mail.sic.ac.cn
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Adsorption Mechanism of NaY Zeolite on Space Contaminants in the CO2-rich Atmosphere of Mars
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摘要: 利用多孔沸石分子筛实时收集空间分子污染物, 是解决在轨航天器空间分子污染的新方法. 除高真空环境外, 飞行任务阶段的火星探测器还面临特殊的富CO2大气环境. 为了克服空间分子污染物对火星探测器的高灵敏分析仪及其他光学敏感部件造成的污染, 同时降低分子污染物掩盖潜在生命迹象或导致假阳性结果的可能性, 需要验证沸石分子筛是否可以应用于火星探测器. 针对火星探测器面临的特殊火星大气环境, 本文重点开展富CO2大气环境下, NaY沸石分子筛对空间分子污染物的吸附作用机制研究. 选用甲苯(C7H8)作为目标分子污染物, 模拟证实CO2分子主要吸附于NaY沸石β笼位点, 甲苯分子则优先吸附于超笼位点, CO2分子的存在并不影响甲苯分子的吸附. 因此, 在火星富CO2大气条件下, NaY沸石分子筛可以应用于火星探测器, 用于控制空间分子污染物水平.Abstract: Zeolite can effectively collect space contaminants in real time, which is a new approach to control the space molecular contamination. During the long-duration flight, the Mars probe faces not only a high-vacuum environment, but also a special CO2-rich environment in the Martian atmosphere. In order to overcome the molecular contamination of the highly sensitive analyzers and other optical sensitive parts of the Mars probe, and as well as to reduce the possibility of false-positive signs of life caused by the molecular contaminant, there is an urgent need to verify whether the zeolite molecular adsorption coating can be applied to Mars probe mission. In order to simulate the special Martian atmospheric environment, this work focuses on the adsorption behavior of NaY zeolite on toluene under CO2 atmosphere. It is confirmed that CO2 molecules are mainly adsorbed at the β-cage site of NaY zeolite, while toluene molecules are prefer-entially adsorbed at the “super-cage” site. So the NaY zeolite is fully applicable under the real CO2-rich conditions in Martian atmosphere, and the adsorption properties of the coating on the low concentration molecular pollutants are not affected.
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Key words:
- Mars probe /
- CO2-rich Martian atmosphere /
- NaY zeolite /
- Space contamination /
- Adsorption mechanism
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图 3 C7H8 (a)和CO2 (b)分子结构模型
Figure 3. Structure diagram of C7H8 (a) and CO2 (b) molecules
图 4 NaY沸石对CO2分子的模拟吸附量与实测吸附量对比
Figure 4. Comparisons of simulated and measured adsorption capacity of NaY zeolite on CO2 molecules
图 5 不同温度情况下NaY沸石对CO2分子的模拟吸附量(a)及吸附热(b)
Figure 5. Simulated adsorption capacity (a) and adsorption heat (b) of NaY zeolite on CO2 molecules under different temperatures
图 6 压力为500 Pa时CO2分子在NaY沸石内部的分布密度
Figure 6. Distribution density of CO2 molecules in NaY zeolite at P = 500 Pa
图 7 CO2及C7H8分子在NaY沸石内部的竞争吸附曲线
Figure 7. Competitive adsorption characteristics of CO2 and C7H8 molecules in NaY zeolite
图 8 NaY沸石内部CO2及C7H8分子的分布密度. (a)中红色表示CO2, 绿色表示C7H8
Figure 8. Distribution density of CO2 and toluene molecules in NaY zeolite. Red represents CO2 and green represents C7H8 in (a)
图 9 NaY-CO2沸石对C7H8分子的模拟吸附曲线
Figure 9. Simulated adsorption capacity curves of NaY-CO2 zeolite for C7H8 molecules
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