Heo Sujeong, Kim Munjeong, Kim Wooram, Jo Young Min, Park Young-Kwon, Jeon Jong-Ki
Department of Chemical Engineering, Kongju National University, Cheonan 31080, Korea.
Department of Environmental Science and Engineering, Kyung Hee University, Yongin 17104, Korea.
J Nanosci Nanotechnol. 2019 Dec 1;19(12):7906-7910. doi: 10.1166/jnn.2019.16782.
The aim of this study is to elucidate the influence of an iridium loading strategy over hexaaluminate on the catalytic performance during the decomposition of liquid monopropellants based on ammonium dinitramide (ADN). Powder-type and pellet-type Ir/hexaaluminate catalysts were prepared and their chemico-physical properties were characterized by N₂ adsorption, XRD, XRF, and SEM. There were considerable differences in the Ir amounts present on the surface according to the impregnation method employed. The catalytic activities of three types of Ir/hexaaluminate catalysts to decompose the ADN-based liquid monopropellant were compared using a semi-batch type of reactor. Pellet-type Ir/hexaaluminate catalyst, which formed hexaaluminate into a pellet and where iridium was impregnated during the last stage, showed the lowest onset temperature during the decomposition of the ADN-based liquid monopropellant, having the effect of lowering the decomposition onset temperature by around 60 °C compared to that without a catalyst. This was due to the pellet-type Ir/hexaaluminate having a larger surface area and a large number of Ir active sites on its surface.
本研究的目的是阐明铱负载策略对六铝酸盐的影响，以及其在基于二硝酰胺铵（ADN）的液体单推进剂分解过程中的催化性能。制备了粉末型和颗粒型Ir/六铝酸盐催化剂，并通过N₂吸附、XRD、XRF和SEM对其化学物理性质进行了表征。根据所采用的浸渍方法，表面存在的铱含量存在显著差异。使用半间歇式反应器比较了三种类型的Ir/六铝酸盐催化剂对基于ADN的液体单推进剂的分解催化活性。颗粒型Ir/六铝酸盐催化剂是将六铝酸盐制成颗粒，并在最后阶段浸渍铱，在基于ADN的液体单推进剂分解过程中显示出最低的起始温度，与无催化剂相比，具有将分解起始温度降低约60°C的效果。这是由于颗粒型Ir/六铝酸盐具有更大的表面积和其表面上大量的Ir活性位点。
