高校化学工程学报
高校化學工程學報
고교화학공정학보
JOURNAL OF CHEMICAL ENGINEERING OF CHINESE UNIVERSITIES
2014年
3期
472-476
,共5页
烟酸锶%热解%热解动力学%热重法
煙痠鍶%熱解%熱解動力學%熱重法
연산송%열해%열해동역학%열중법
nicotinic acid strontium%thermal decomposition%kinetics of thermal decomposition%TG
采用TG-DTG/DTA等方法对新合成的烟酸锶[Sr(C6H4NO2)2?3H2O]的热解过程及其动力学行为进行了研究,并利用非等温动力学原理,通过Flynn-Wall-Ozawa, Kissinger, Friedman和Freeman-Carroll等方法,计算得到烟酸锶三步热解过程的动力学参数。结果表明烟酸锶的热解分为三步,第一步为失去结晶水的过程,第二步和第三步为配体失去和配合物结构坍塌的过程;活化能(E)分别为(68.03±0.38),(369.98±9.76),(255.53±7.53) kJ?mol-1;指前因子(lgA)分别为7.68,24.69,12.88;反应级数(n)分别为1.1,2.8,1.4。同时采用Coats-Redfern法确定了烟酸锶三步热解阶段可能的机理函数及热解动力学方程。通过多步线性回归方法,确定烟酸锶三步热解过程的最佳动力学模型分别为F1(n=1),2D(n=2),AE4(n=4)。
採用TG-DTG/DTA等方法對新閤成的煙痠鍶[Sr(C6H4NO2)2?3H2O]的熱解過程及其動力學行為進行瞭研究,併利用非等溫動力學原理,通過Flynn-Wall-Ozawa, Kissinger, Friedman和Freeman-Carroll等方法,計算得到煙痠鍶三步熱解過程的動力學參數。結果錶明煙痠鍶的熱解分為三步,第一步為失去結晶水的過程,第二步和第三步為配體失去和配閤物結構坍塌的過程;活化能(E)分彆為(68.03±0.38),(369.98±9.76),(255.53±7.53) kJ?mol-1;指前因子(lgA)分彆為7.68,24.69,12.88;反應級數(n)分彆為1.1,2.8,1.4。同時採用Coats-Redfern法確定瞭煙痠鍶三步熱解階段可能的機理函數及熱解動力學方程。通過多步線性迴歸方法,確定煙痠鍶三步熱解過程的最佳動力學模型分彆為F1(n=1),2D(n=2),AE4(n=4)。
채용TG-DTG/DTA등방법대신합성적연산송[Sr(C6H4NO2)2?3H2O]적열해과정급기동역학행위진행료연구,병이용비등온동역학원리,통과Flynn-Wall-Ozawa, Kissinger, Friedman화Freeman-Carroll등방법,계산득도연산송삼보열해과정적동역학삼수。결과표명연산송적열해분위삼보,제일보위실거결정수적과정,제이보화제삼보위배체실거화배합물결구담탑적과정;활화능(E)분별위(68.03±0.38),(369.98±9.76),(255.53±7.53) kJ?mol-1;지전인자(lgA)분별위7.68,24.69,12.88;반응급수(n)분별위1.1,2.8,1.4。동시채용Coats-Redfern법학정료연산송삼보열해계단가능적궤리함수급열해동역학방정。통과다보선성회귀방법,학정연산송삼보열해과정적최가동역학모형분별위F1(n=1),2D(n=2),AE4(n=4)。
The thermal decomposition process and kinetics of [Sr(C6H4NO2)2?3H2O] were investigated by TG-DTG/DTA. Following the non-isothermal kinetics theory and Flynn -Wall-Ozawa, Kissinger, Friedman and Freeman-Carroll methods, the kinetic parameters of the thermal decomposition of [Sr(C6H4NO2)2?3H2O] were obtained. The results show that the pyrolysis process can be divided into three steps:the first step is the loss of crystallized water;the second and the third steps are the loss of ligands and the collapse of the complex structure, respectively. The kinetic equations for the thermal decomposition steps were obtained by the Coats-Redfern method. The results calculated for each step are:E=(68.03±0.38), (369.98±9.76), (255.53±7.53) kJ?mol-1 (activation energy (E)), lgA=7.68, 24.69, 12.88 (frequency factor (A));n=1.1, 2.8, 1.4 (reaction order (n)), respectively. A possible kinetic model is established as F1(n =1), 2D(n =2), AE4(n =4) via the multiple linear regression method.