DICP OpenIR
Subject Area物理化学
CATALYTIC DECOMPOSITION OF HAN-BASED MONOPROPELLANT AT ROOM TEMPERATURE OVER Ir/SiO2 CATALYST
Ren XG(任晓光); Wang AQ(王爱琴); Xu DZ(徐德祝); Cong Y(丛昱); Wang XD(王晓东); Zhang T(张涛)
Conference NameThird International Conference on Green Propellants for Space Propulsion
Conference Date2006-9-17
2006-09-17
Conference PlaceFrance
Alternative Title室温条件下硝酸羟胺推进剂的催化分解
Pages暂无/2
Department十五室
AbstractEnergetic liquid compounds known as monopropellants are used for propulsion and gas generator purposes [1]. The conventional monopropellant is hydrazine. However, the high vapor pressure of hydrazine and its high toxicity induce high storage and handling costs. Thus, the replacement of hydrazine by a less toxic propellant is desired. HAN (Hydroxyl ammonium nitrate) is thought of as a promising substitute for hydrazine due to its high density, high specific impulse and low freezing point[2]. The key point to apply HAN blends to the propellant thruster is to find a highly active catalyst which can decompose HAN at low temperatures and can survive at the high temperature in oxidizing atmosphere containing steam. Recently, Kappenstein et al [1-3] have reported that platinum supported on thermally stable Si-doped alumina displays a good activity at low temperatures (down to room temperature). However, in the presence of a fuel (glycine, triethanolammonium nitrate, urea, etc.), ignition of HAN at room temperature has not been realized so far. In the present work, we demonstrate that Ir/SiO2 behaves more active than the other noble metal based catalysts, and the pretreatment of Ir/SiO2 with nitric acid can greatly improve the initial activity so that the ignition of HAN blends (HAN, glycine and water) at room temperature is for the first time realized. Various supported precious metal catalysts were screened for HAN-based monopropellants decomposition by open-cup experiments, thermal analysis method as well as by a constant volume batch reactor. The results show that Ir/SiO2 was the most active among the investigated catalysts. HAN80 could be decomposed at room temperature over the Ir/SiO2, but preheating up to 80℃ is necessary for its decomposition over the Ir/Al2O3, manifesting the important effect of the support nature. Even after 20 successive injections, the Ir/SiO2 was still active. However, when HANGLY26 was used as a propellant, no any catalyst could behave active at room temperature, probably due to adsorption and site-blocking on the catalyst surface by glycine. It is very interesting that when the Ir/SiO2 catalyst was pretreated by nitric acid, the catalyst exhibited a much improved activity that the ignition of HANGLY26 was realized at room temperature for the first time, though the ignition delay became longer than that in the case of HAN80. This preliminary result opened a new way to the development of a more efficient catalyst for application in environmental benign monopropellant thruster.
Language中文
Document Type会议论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/112098
Collection中国科学院大连化学物理研究所
Corresponding AuthorZhang T(张涛)
Recommended Citation
GB/T 7714
Ren XG,Wang AQ,Xu DZ,et al. CATALYTIC DECOMPOSITION OF HAN-BASED MONOPROPELLANT AT ROOM TEMPERATURE OVER Ir/SiO2 CATALYST[C],2006:暂无/2.
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