Wan Qian, Zhang Ruobing, Zhang Yimin
School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
State Environment Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China.
Gels. 2022 Feb 18;8(2):130. doi: 10.3390/gels8020130.
As a common industrial by-product, the spend fluid catalytic-cracking (SFCC) catalyst was used to prepare phosphate-based geopolymer for the first time. The structure and property of geopolymer with phosphoric acid concentration ranging from 6 to 14 mol/L was characterized by compressive strength measurements, X-ray powder diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and Al and Si nuclear magnetic resonance (NMR). A stable binder was formed with the compressive strength in the range of 9.8 to 30.2 MPa when the acid concentration was between 6 and 12 mol/L. The higher concentration of acid can promote the dissolution of raw materials and formation of geopolymer gels. The coordination of silicon and aluminum in geopolymer gel synthesized with the SFCC catalyst and metakaolin is similar. Compared with the geopolymer with metakaolin, which forms more Si-O-Al bonds, in the networks of geopolymer with the SFCC catalyst, more Si(Al)-O-P bonds were formed. These results indicate that the SFCC catalyst can be an excellent raw material for the synthesis of phosphate-based geopolymer.
作为一种常见的工业副产品，废流化催化裂化（SFCC）催化剂首次被用于制备磷酸盐基地质聚合物。通过抗压强度测量、X射线粉末衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）以及铝和硅核磁共振（NMR）对磷酸浓度在6至14 mol/L范围内的地质聚合物的结构和性能进行了表征。当酸浓度在6至12 mol/L之间时，形成了一种稳定的粘结剂，其抗压强度在9.8至30.2 MPa范围内。较高的酸浓度可促进原料的溶解和地质聚合物凝胶的形成。用SFCC催化剂和偏高岭土合成的地质聚合物凝胶中硅和铝的配位情况相似。与形成更多Si-O-Al键的偏高岭土地质聚合物相比，在SFCC催化剂的地质聚合物网络中形成了更多的Si(Al)-O-P键。这些结果表明，SFCC催化剂可以成为合成磷酸盐基地质聚合物的优良原料。
