Study on the pyrolysis characteristics of walnut processing by-products

• Published in: IOP conference series. Earth and environmental science Vol. 508; no. 1; pp. 12126 - 12131
• Main Authors: Xu, Shanfeng, Ou, Chuan, Chen, Yuzhu, Xiao, Hui, Fu, Chengang, Lu, Wenyi, Wu, Zhuoling
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.05.2020
• Subjects: Activation energy; Dehydration; Heat treatment; Heating rate; Pyrolysis; Thermal degradation; Thermal stability; Thermogravimetric analysis; Walnuts; Weight loss
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/508/1/012126

Thermogravimetric analysis (TG) was used to study the thermal degradation behaviour of walnut shell and walnut meal during thermal treatment, and the Kissinger and Flynn-Wall-Ozawa equation were used to calculate the activation energy. The heating rate was 5, 10, 15, 20, 25 °C/min with nitrogen atmosphere. The results showed that the thermal degradation process of walnut shell and walnut meal can be divided into three stages: dehydration stage, rapid pyrolysis and carbonization stage. The greater the heating rate was, the faster the thermal degradation became. At the same heating rate, the weight loss rate, the peak conversion rate and the carbon residue in the rapid pyrolysis stage of walnut shell were all greater than those of walnut meal. The activation energy of thermal degradation of walnut shell was 194.54 kJ/mol and 194.50 kJ/mol. The activation energy of thermal degradation of walnut meal was 167.37 kJ/mol and 169.78 kJ/mol. Walnut shell had higher thermal degradation activation energy and thermal stability.