Impact of HAN Ternary Propellant System Decomposition on Catalytic Sustainability,Propellants, Explosives, Pyrotechnics

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Impact of HAN Ternary Propellant System Decomposition on Catalytic Sustainability
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-02-03 , DOI: 10.1002/prep.202000110
Ruchika Agnihotri ₁ , Charlie Oommen ₁

Affiliation

Aqueous solution of Hydroxylammonium nitrate (HAN) in combination with a suitable fuel has been explored as a promising high performing green monopropellant in recent times. The current study primarily explores the effect of the addition of a fuel component into HAN solution on the sustainability of a recently developed catalyst which was examined for the only binary system consisting of HAN and water. The HAN ternary system examined was HAN: methanol: water in 70 : 15 : 15 (w/w) composition. The endurance of an ‘iridium over alumina’ catalyst and an indigenously developed cobalt doped ceria‐based catalyst was analysed using a batch reactor wherein a pressure rise during decomposition of propellant whilst a pulse mode operation was monitored. Catalysts were also characterized via SEM/EDS, XRD, and XPS to identify changes over the period of sequential injection in the batch reactor. Doped ceria catalyst was found to be far robust and resistant to any poisoning when compared to iridium catalyst at run time of the operation involving nearly 45 sequential injections of propellant over the catalyst.

中文翻译：

HAN三元推进剂体系分解对催化可持续性的影响

近年来，硝酸羟铵（HAN）的水溶液与合适的燃料相结合已被研究为一种有前途的高性能绿色单推进剂。当前的研究主要探讨了在HAN溶液中添加燃料成分对最近开发的催化剂的可持续性的影响，该催化剂针对唯一由HAN和水组成的二元体系进行了研究。所检查的HAN三元系统是HAN：甲醇：水（组成为70：15：15（w / w））。使用间歇式反应器分析了“铱氧化铝”催化剂和本地开发的钴掺杂的基于二氧化铈的催化剂的耐久性，其中在推进剂分解过程中的压力上升同时监测了脉冲模式操作。催化剂也通过SEM / EDS，XRD和XPS，以识别间歇式反应器中顺序注入期间的变化。与铱催化剂相比，掺杂二氧化铈催化剂在操作运行时与铱催化剂相比，具有很强的鲁棒性，并且对任何中毒具有抵抗力，该操作涉及在催化剂上连续注入推进剂45次。

更新日期：2021-03-04

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