Study on Thermal Decomposition Behavior, Gaseous Products, and Kinetic Analysis of Bis-(Dimethylglyoximato) Nickel(II) Complex Using TG-DSC-FTIR-MS Technique

Ergang Yao,Jianhua Yi,Fengqi Zhao,Yanjing Yang,Taizhong Huang,Ningning Zhao,Haijian Li,Changjian Wang,Siyu Xu

doi:10.3390/catal10030331

Ergang Yao, Jianhua Yi + Show 7 more

Open Access

https://doi.org/10.3390/catal10030331

Copy DOI

Abstract

The fiber-like bis-(dimethylglyoximato) nickel(II) complex, Ni(DMG)2 was successfully synthesized. The obtained samples were characterized by SEM-EDS, FT-IR, XRD, and XPS. The TG-DSC-FTIR-MS coupling technique was used to characterize the thermal decomposition behavior and evolved gas analysis of Ni(DMG)2. The non-isothermal decomposition reaction kinetic parameters were obtained by both combined kinetic analysis and isoconversional Vyazovkin methods. It was found that Ni(DMG)2 begins to decompose at around 280 °C, and a sharp exothermic peak is observed in the DSC curve at about 308.2 °C at a heating rate of 10 °C·min−1. The main gaseous products are H2O, NH3, N2O, CO, and HCN, and the content of H2O is significantly higher than that of the others. The activation energy obtained by the combined kinetic analysis method is 170.61 ± 0.65 kJ·mol−1. The decomposition process can be described by the random nucleation and growth of the nuclei model. However, it was challenging to attempt to evaluate the reaction mechanism precisely by one ideal kinetic model.

Highlights

Combustion catalysts, as one of the main ingredients, play an essential role in the modification of the burning rate and combustion stability of solid propellants [1,2,3]
The selection principle and method of the combustion catalyst are their catalytic activity and energy. Transition metal oxides such as NiO are a class of high-efficiency combustion catalysts for solid propellants and have excellent catalytic effect [15], they have no contribution to the combustion except for their catalytic effect
The main objective of this paper is to investigate the thermal decomposition reaction behavior kinetic parameters obtained by combined kinetic analysis and isoconversional Vyazovkin methods are and non-isothermal decomposition reaction kinetics of the Ni(DMG)2 complex

Summary

Introduction

Combustion catalysts, as one of the main ingredients, play an essential role in the modification of the burning rate and combustion stability of solid propellants [1,2,3]. A variety of combustion catalysts, such as transition metal oxides (e.g., CuO, PbO, NiO) [4,5,6,7,8], compounds (e.g., lead salicylate, copper adipate, copper salicylate) [9,10,11], and nano-metal particles (e.g., Ni, Bi) [12,13,14], have been up to now studied extensively. The selection principle and method of the combustion catalyst are their catalytic activity and energy. Transition metal oxides such as NiO are a class of high-efficiency combustion catalysts for solid propellants and have excellent catalytic effect [15], they have no contribution to the combustion except for their catalytic effect.

Objectives

Results

Conclusion