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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >THERMAL STUDIES OF (NH4)(2) CR2O7, (NH4)(2) WO4, AND (NH4)(6)MO7O24-CENTER-DOT-4H(2)O DEPOSITED ON ZRO2
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THERMAL STUDIES OF (NH4)(2) CR2O7, (NH4)(2) WO4, AND (NH4)(6)MO7O24-CENTER-DOT-4H(2)O DEPOSITED ON ZRO2

机译：在ZRO2上沉积的（NH4）（2）CR2O7，（NH4）（2）WO4和（NH4）（6）MO7O24-CENTER-DOT-4H（2）O的热研究

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Ammonium molybdate, ammonium dichromate or ammonium tungstate modified zirconia are considered to be catalysts with superacid properties. The activation of these catalysts involves complex chemical changes. In the present study, combined TGA-DTA, TG-MS and TG-FTIR techniques were used to investigate the weight loss and the phase transformations of the solids and to monitor the chemical compounds that evolved under controlled heating in different environments. Through online analysis of the evolved species, some insight into the activation mechanism can be obtained. The phase transformation temperature of zirconia was shifted to a higher temperature when the sample was treated with any of these anions, which indicates that the thermal stability of the catalysts was enhanced. [References: 5]
机译：钼酸铵，重铬酸铵或钨酸铵改性的氧化锆被认为是具有超酸性质的催化剂。这些催化剂的活化涉及复杂的化学变化。在本研究中，结合使用TGA-DTA，TG-MS和TG-FTIR技术研究了固体的重量损失和相变，并监测了在不同环境中受控加热条件下产生的化合物。通过对进化物种的在线分析，可以获得对激活机制的一些了解。当用这些阴离子中的任一种处理样品时，氧化锆的相变温度移至更高的温度，这表明催化剂的热稳定性得到增强。 [参考：5]

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