School of Chemistry and Advanced Centre of Research in High Energy Materials, University of Hyderabad, Hyderabad 500046, India.
J Hazard Mater. 2011 Sep 15;192(3):1314-20. doi: 10.1016/j.jhazmat.2011.06.036. Epub 2011 Jul 13.
Compared to the conventional ammonium perchlorate based solid rocket propellants, burning of ammonium nitrate (AN) based propellants produce environmentally innocuous combustion gases. Application of AN as propellant oxidizer is restricted due to low reactivity and low energetics besides its near room temperature polymorphic phase transition. In the present study, anatase-brookite mixed phase TiO(2) nanoparticles (~ 10 nm) are synthesized and used as catalyst to enhance the reactivity of the environmental friendly propellant oxidizer ammonium nitrate. The activation energy required for the decomposition reactions, computed by differential and non-linear integral isoconversional methods are used to establish the catalytic activity. Presumably, the removal of NH(3) and H(2)O, known inhibitors of ammonium nitrate decomposition reaction, due to the surface reactions on active surface of TiO(2) changes the decomposition pathway and thereby the reactivity.
与传统的高氯酸铵基固体推进剂相比，硝酸铵（AN）基推进剂的燃烧产生环境无害的燃烧气体。由于反应性低和能量低，以及其接近室温的多晶型相变，AN 作为推进剂氧化剂的应用受到限制。在本研究中，合成了锐钛矿-板钛矿混合相 TiO(2)纳米颗粒（~10nm），并用作催化剂来提高环境友好型推进剂氧化剂硝酸铵的反应性。通过差示和非线性积分等转化率方法计算的分解反应所需的活化能用于确定催化活性。据推测，由于 TiO(2)的活性表面上的表面反应，去除了 NH(3)和 H(2)O，已知的硝酸铵分解反应抑制剂，改变了分解途径，从而改变了反应性。
