Open AccessEffect of Nickel Nanopowder on the Thermal Degradation of Coal Tar Distillate
Author(s) -
Sergey V. Kim,
М. И. Байкенов,
K. S. Ibishev,
М. Г. Мейрамов,
Fengyun Ma,
Т. О. Хамитова
Publication year - 2022
Publication title -
ķaraġandy universitetìnìn̦ habaršysy. himiâ seriâsy
Language(s) - English
Resource type - Journals
eISSN - 2663-4872
pISSN - 2518-718X
DOI - 10.31489/2022ch2/2-22-19
Subject(s) - nickel , activation energy , tar (computing) , distillation , coal , materials science , char , thermogravimetric analysis , coal tar , chemical engineering , crystallite , chemistry , analytical chemistry (journal) , nuclear chemistry , metallurgy , organic chemistry , computer science , engineering , programming language
Regularities of influence of nickel nanpowder on the thermal degradation of coal tar distillate were determined using model-free Kissinger, Flynn-Wall-Ozawa and model-fitting Coats-Redfern methods. Coal tar distillate with a boiling point <350 °C was obtained by simple distillation of primary coal tar from the Shubarkol deposit. Nickel nanopowder was used as a catalyst and was added to coal tar distillate in a quantity of 1 % of the mass of the distillate and then the process of thermal degradation of coal tar distillate was conducted at heating rates 5, 10 and 20 °C/min in an inert gas medium. Nickel powder was obtained by high-voltage discharge impact on the dc electrolysis. X-ray diffraction (XRD) analysis showed that the obtained nickel powder has face-centered cubic structure and the average crystallite size calculated by Scherrer equation was ~ 34 nm. Calculations of activation energy were performed via processing of thermogravimetric data. The Kissinger method showed that the activation energy value decreases from 145.19 kJ/mol to 43.65 kJ/mol, by the Flynn-Wall-Ozawa (FWO) method the value decreases from 152.82 kJ/mol to 51.65 kJ/mol, and by the Coats-Redfern method the value decreases from 143.38 kJ/mol to 52.64 kJ/mol. Applicability of these methods are ensured by the high values of correlation coefficients.