Department of Physics, Faculty of Science, Eskişehir Technical University, 26470, Eskişehir, Turkey.
Graduate School of Science, Anadolu University, 26470, Eskisehir, Turkey.
Environ Sci Pollut Res Int. 2019 Jun;26(16):16616-16627. doi: 10.1007/s11356-019-04996-4. Epub 2019 Apr 15.
In this study, a chabazite-rich tuff (CHA) from the Bala deposit of Ankara region (Turkey) and its modified forms (CuCHA, AgCHA, FeCHA, and HCHA samples) were investigated at 273 and 298 K using volumetric apparatus up to 100 kPa. The chabazite samples were characterized by using thermal analysis (TG-DTG-DTA), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy with detector X-ray energy dispersive (SEM-EDX), Fourier transform infrared (FT-IR), and N adsorption methods. It was found that natural chabazite is composed of predominantly chabazite with small amounts of clinoptilolite and erionite. XRD showed that there are major structural changes to Fe- and H-exchanged chabazite samples. Capacity of chabazites for CH ranged from 0.168 and 1.341 mmol/g. Among all the modified forms, it was observed that Ag form of chabazite zeolite had the greatest methane adsorption capacity at both temperatures.
在这项研究中，使用体积测定仪在 273 和 298 K 下研究了来自安卡拉地区（土耳其）巴拉矿床的富含方沸石的凝灰岩（CHA）及其改性形式（CuCHA、AgCHA、FeCHA 和 HCHA 样品），直至 100 kPa。使用热分析（TG-DTG-DTA）、X 射线衍射（XRD）、X 射线荧光（XRF）、带有 X 射线能量色散检测器的扫描电子显微镜（SEM-EDX）、傅里叶变换红外（FT-IR）和 N 吸附方法对沸石样品进行了表征。结果发现，天然方沸石主要由方沸石组成，少量的斜发沸石和丝光沸石。XRD 表明，Fe 和 H 交换的方沸石样品的结构发生了重大变化。方沸石对 CH 的容量范围为 0.168 至 1.341 mmol/g。在所有改性形式中，发现在两种温度下，Ag 形式的方沸石具有最大的甲烷吸附能力。
