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A new facile synthesis, kinetic mechanism and some thermodynamic studies of thermal transformation of α-LiZnPO4·H2O
Reaction Kinetics, Mechanisms and Catalysis ( IF 1.7 ) Pub Date : 2019-08-08 , DOI: 10.1007/s11144-019-01652-3
Nantawat Phonchan , Chanaiporn Danvirutai , Pittayagorn Noisong , Sujittra Youngme , Sira Sansuk

α-LiZnPO4·H2O was successfully synthesized via a new simple route in an aqueous media at ambient temperature. The as-prepared and the calcined powders were confirmed by standard characterization methods. The SEM micrographs of the title compound and its dehydration product were studied. The experimental enthalpy of dehydration was evaluated from DSC data, which was found to be close to the standard enthalpy of water vaporization. α-LiZnPO4·H2O dehydrates in a single step. Therefore, this compound is an additional ideal case for studying the decomposition kinetics. Non-isothermal dehydration kinetics was studied from TG data using Ozawa–Flynn–Wall (OFW) and Kissinger–Akahira–Sunose (KAS) methods including their iterative procedures, as well as some reliable solid-state kinetic equations of Coats–Redfern, Madhysudanan–Krishnan–Ninan (MKN), Tang and Wanjun. The most probable mechanism function was determined using the master plots method. The dehydration mechanism was found to be the chemical reaction with the one-third order reaction or the type F1/3 reaction model with the differential form of f(α) = 3/2 (1 − α)1/3 and the integral form of g(α) = 1 − (1 − α)2/3. The calculated activation energy value is exact and reliable. The discussions about the results of XRD, SEM, DSC, FTIR and the most probable mechanism function of dehydration are consistent.



中文翻译:

α-LiZnPO热转变的新的简便合成,动力学机理和一些热力学研究4·H2个Ø

α-LiZnPO 4 ·H 2 O的成功通过在水性介质中在环境温度下一个新的简单的路线合成。通过标准表征方法确认了所制备和煅烧的粉末。研究了标题化合物及其脱水产物的SEM显微照片。从DSC数据评估脱水的实验焓,发现其接近水汽化的标准焓。α-LiZnPO 4 ·H 2O在一个步骤中脱水。因此,该化合物是研究分解动力学的另一种理想情况。使用Ozawa–Flynn–Wall(OFW)和Kissinger–Akahira–Sunose(KAS)方法从TG数据研究了非等温脱水动力学,包括迭代程序以及Coats–Redfern,Madhysudanan的一些可靠的固态动力学方程–克里希南·尼南(MKN),唐和万钧。最可能的机制功能是使用主图方法确定的。发现脱水机理是三阶反应的化学反应或微分形式为fα)= 3/2(1-  α1/3的F 1/3型反应模型gα)= 1-(1-  α2/3的积分形式。计算出的活化能值准确可靠。关于XRD,SEM,DSC,FTIR和最可能的脱水机理功能的讨论是一致的。

更新日期:2019-08-08
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