Abstract Five layered double hydroxides (LDHs) containing different ratios of the rare-earth element La3+ were prepared, and their suitability was investigated to prevent spontaneous combustion of long-flame coal (LFC). LDHs with different ratios of the rare-earth element La3+ were prepared and characterised through X-ray diffraction (XRD), scanning-electron microscopy (SEM), and EDX analysis. The five LDHs were mixed uniformly with LFC and called LFC-ZnMgAl-LDH, LFC-LaZnMgAl-LDH-1, LFC-LaZnMgAl-LDH-2, LFC-LaZnMgAl-LDH-3, and LFC-LaZnMgAl-LDH-4. Thermogravimetry-differential scanning calorimetry and in situ diffuse-reflectance infrared Fourier transform spectroscopy revealed that with an increase in the La3+ concentration, the characteristic temperatures of complexes increased roughly. Concurrently, active functional groups in complexes decreased gradually, and LDHs exhibited a stronger inhibition effect in the following order: ZnMgAl-LDH

中文翻译：

---

含稀土元素镧的层状双氢氧化物对煤自燃的抑制作用

摘要 制备了五种含有不同比例的稀土元素La3+的层状双氢氧化物（LDHs），并研究了它们对防止长焰煤（LFC）自燃的适用性。制备了具有不同稀土元素 La3+ 比例的 LDH，并通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和 EDX 分析对其进行了表征。将五种 LDH 与 LFC 均匀混合，称为 LFC-ZnMgAl-LDH、LFC-LaZnMgAl-LDH-1、LFC-LaZnMgAl-LDH-2、LFC-LaZnMgAl-LDH-3 和 LFC-LaZnMgAl-LDH-4。热重-差示扫描量热法和原位漫反射红外傅里叶变换光谱表明，随着La3+浓度的增加，配合物的特征温度大致增加。同时，