Catalytic decomposition of hydroxylamine nitrate and hydrazine nitrate using Ru/ZSM-5 catalyst under mild reaction conditions

Abstract

The Ru/ZSM-5 catalyst was shown to be an efficient heterogeneous catalyst for decomposition of hydroxylamine nitrate and hydrazine nitrate. The catalyst could be recovered by filtration and reused, showing good potential for industrial application.

Catalytic decomposition of hydrazine nitrate and hydroxylamine nitrate in radioactive nitric acid waste liquid using Ru/AC catalyst

“…[1][2][3][4][5] During the reduction process, a substantial quantity of the secondary radioactive waste fluid containing reducing agents (0.3 mol per L HAN, 0.1 mol per L HN) and HNO 3 (0.8-1.8 mol per L) is generated. 6 To minimize waste volume and recover nitric acid, evaporation and denitration treatments are necessary. 7,8 However, the presence of reducing agents can significantly impede subsequent processing due to their potential for chemical explosions during high temperature treatment.…”

“…[15][16][17][18] However, there is limited research on the application of Ru catalysts in the catalytic decomposition of HAN and HN. 6 Therefore, in this study, a 5 wt% Ru/AC catalyst was prepared using the impregnation method and its activity was evaluated. Additionally, the influence of different working conditions on the catalyst's performance was also investigated.…”

Study on the Deactivation Mechanism of Ru/C Catalysts

“…In recent years, the China Institute of Atomic Energy has designed and developed Ru/C catalysts and catalytic decomposition processes for the "nitric acid hydroxylaminenitric acid hydrazine" system [31,32]. In this system, aqueous waste containing reducing agents undergoes full decomposition upon contact with the catalyst, yielding nitrogen oxides, nitrogen gas, water, and small amounts of ammonia, effectively achieving removal objectives.…”

The reaction kinetics and mechanism of catalytic decomposition of hydrazine nitrate on Ru/C catalyst in nitric acid solutions

“…Very recently, heterogeneous catalysis (eqn (3)) has been proven to be an efficient and readily available method for effecting the decomposition of hydrazine nitrate. [7][8][9][10][11] This method offers several advantages: (i) a small amount of tail gas generated, (ii) ease of operation, (iii) simple device structure, and (iv) small reactor volume. In addition, only a small amount of ammonium nitrate is generated during the catalytic decomposition of hydrazine nitrate (approximately a mass of 0.79 kg of ammonium nitrate is produced when disposing of one ton of waste liquid), and this generation of ammonium nitrate has almost no effect on the chemical denitration because ammonium nitrate is stable in various solutions.…”