“…With the increase in temperature, peak shifted to lower ranges (Regalbuto, 2006). FTIR analysis of treated catalyst with different temperatures showed some major bending vibration at around 3,415, 1,098, 665, 624, and 528 cm −1 which is related to the O-H group (Wan & Wang, 2017), Si-O (Su, Li, Liu, Huang, & Yu, 2016), amines (Ptaszkowska-Koniarz, Goscianska, & Pietrzak, 2018), SO 2− 4 (Jiang, Zhao, Xue, Xu, & Ye, 2018), and Fe-O (Cao et al, 2018), respectively. Weak bonds were observed at around 1,014, 624, and 560 cm −1 .…”