中文摘要：

热力学的稳定性， microvoid 分发和自然白榴火山灰蛋白石页岩(POS ) 的阶段转变在这个工作系统地被学习。XRD 分析证明包括 microcrystal 方石英和 tridymite， opal-CT 是 POS 的一个主要部件。DTA 和英尺红外显示在非结晶的 SiO ₂ 材料的表面上有许多氢氧根组和酸地点。FE-SEM 分析展出了非结晶的 SiO ₂ 粒子(蛋白石 -- 一) 在叠上盖住定序 microcrystal 方石英和 tridymite。同时， MIP 分析证明 POS 的孔和毛孔尺寸分发在 600 敨楳? 景渠愭歬湡 ? 業瑸牵 ? 業牣 ' 覟碑捑淬硴宠 B 愠灰楬慣楴湯椠 ? 潬 ? 整灭牥瑡牵 ?牰瑯 ' 虡 N 敶映扡楲c 下面仍然是制服吗？？

英文摘要：

Thermodynamic stability, microvoid distribution and phases transformation of natural pozzolana opal shale（POS） were studied systematically in this work. XRD analysis showed that opal-CT, including microcrystal cristobalite and tridymite, is a major component of POS. DTA and FT-IR indicated that there were many hydroxyl groups and acid sites on the surface of amorphous SiO2 materials. FE-SEM analysis exhibited amorphous SiO2 particles（opal-A） covering over stacking sequences microcrystal cristobalite and tridymite. Meanwhile, MIP analysis demonstrated that porosity and pore size distribution of POS remained uniform below 600 ℃. Because stable porous microstructure is a key factor in improving photocatalyst activity, POS is suited to preparing highly active supported.