Phosphotungstic acid (HPA)/α-Fe₂O₃-loaded Perlite has been prepared as a recyclable heterogeneous catalyst for the synthesis of xanthenes. The prepared catalyst has been characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) with energy-dispersive X-ray (EDX) spectroscopy, transmission electron microscopy (TEM) with selected-area electron diffraction (SAED) pattern analysis, thermogravimetric analysis (TGA), and Brunauer–Emmett–Teller (BET) measurements. XRD peaks at 2θ = 9.08° and 26.73° (HPA) and 36.03°, 39.72°, and 62.6° (α-Fe₂O₃) showed efficient loading of HPA/α-Fe₂O₃ on the Perlite surface. TEM images of the prepared HPA/α-Fe₂O₃/Perlite corroborated the successful loading of α-Fe₂O₃ on the Perlite. Advantages of this new protocol include facile handling, low cost, easy work-up procedure, and remarkable reusability over several cycles without loss of the catalytic activity.

磷钨酸 (HPA)/α-Fe ₂ O ₃负载珍珠岩已被制备为可回收的多相催化剂，用于合成呫吨。制备的催化剂已通过傅里叶变换红外 (FTIR) 光谱、X 射线衍射 (XRD) 分析、扫描电子显微镜 (SEM) 与能量色散 X 射线 (EDX) 光谱、透射电子显微镜 (TEM) 与选区电子衍射 (SAED) 模式分析、热重分析 (TGA) 和 Brunauer-Emmett-Teller (BET) 测量。2θ = 9.08° 和 26.73° (HPA) 和 36.03°、39.72° 和 62.6° (α-Fe ₂ O ₃ )处的 XRD 峰显示 HPA/α-Fe ₂ O _{3 的}有效负载在珍珠岩表面。制备的 HPA/α-Fe ₂ O ₃ /珍珠岩的TEM 图像证实了 α-Fe ₂ O ₃在珍珠岩上的成功负载。这种新协议的优点包括易于处理、成本低、易于处理程序以及在不损失催化活性的情况下在几个循环中具有显着的可重用性。