In this study, the surface of silica nanoparticles is modified using an organosilane (APTES: 3-aminopropyl (Triethoxysilane)). The surface-grafted nanosilica is employed as an additive to increase the CO₂ storage capacity of gas hydrate. The hydrate formation experiments are performed to measure the amounts of stored gas in the hydrate phase in the presence of various aqueous mixtures, that is, APTES, silica, and the surface-grafted nanosilica. The experiments are implemented for APTES with volume concentrations of 0.3 and 0.5%, grafted nanosilica with mass concentrations of 0.05, 0.1, 0.15, 0.2, and 0.25%, and the nanosilica with mass fraction of 0.2%. The amounts of CO₂ consumption, water to hydrate conversions, storage capacities, and apparent rate constants are obtained for all of the experiments. The results are compared with the formation of gas hydrate in the presence of pure water. The results indicate that the two concentrations of APTES have a slight positive effect (around 10% improvement) on the amount of CO₂ consumption during the hydrate formation compared to the pure water. The surface-grafted nanosilica leads to more CO₂ consumption compared to the APTES and nanosilica for all concentrations. The maximum amount of stored CO₂ and CO₂ storage capacity are achieved by using surface-grafted nanosilica with a mass fraction of 0.2%. The surface-grafted nanosilica improves the CO₂ storage about 42.6% in comparison with the pure water and 35% compared to the silica nanoparticles. Improvement of heat transfer, mass transfer, and CO₂ absorption into the modified silica nanofluid results in an enhancement in the CO₂ storage compared to the other mixtures. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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使用 3-氨基丙基（三乙氧基硅烷）表面接枝二氧化硅纳米粒子以改善 CO2 吸收并增加 CO2 水合物形成过程中的气体消耗

在这项研究中，二氧化硅纳米粒子的表面使用有机硅烷（APTES：3-氨基丙基（三乙氧基硅烷））进行了改性。表面接枝的纳米二氧化硅用作添加剂以增加气体水合物的CO ₂储存能力。进行水合物形成实验以测量在各种水性混合物（即 APTES、二氧化硅和表面接枝的纳米二氧化硅）存在下水合物相中储存的气体量。实验针对体积浓度为 0.3% 和 0.5% 的 APTES、质量浓度为 0.05、0.1、0.15、0.2 和 0.25% 的接枝纳米二氧化硅以及质量分数为 0.2% 的纳米二氧化硅进行。CO ₂的量所有实验都获得了消耗量、水到水合物的转化率、存储容量和表观速率常数。结果与纯水存在下天然气水合物的形成进行了比较。结果表明，与纯水相比，两种浓度的 APTES对水合物形成过程中的CO ₂消耗量具有轻微的积极影响（提高约 10%）。与APTES和纳米二氧化硅相比，对于所有浓度，表面接枝的纳米二氧化硅导致更多的CO ₂消耗。存储CO的最大数量₂和CO ₂的存储容量是通过使用表面接枝的纳米二氧化硅为0.2％的质量分数实现。表面接枝的纳米二氧化硅改善了 CO₂与纯水相比，储存量约为 42.6%，与二氧化硅纳米颗粒相比约为 35%。与其他混合物相比，改性二氧化硅纳米流体中传热、传质和 CO ₂吸收的改进导致 CO ₂存储的增强。© 2021 化学工业协会和 John Wiley & Sons, Ltd.