SYNTHESIS AND CHARACTERIZATION OF HYDROXY-CRAL PILLARED CLAYS
文献类型：期刊论文
| 作者 | ZHAO, DY; YANG, YS; GUO, XX |
| 刊名 | ZEOLITES
 |
| 出版日期 | 1995 |
| 卷号 | 15期号:1页码:58-66 |
| ISSN号 | 0144-2449 |
| 关键词 | Pillared Clays Thermal Stability Synthesis Characterization Chromium |
| 文献子类 | Article |
| 英文摘要 | This paper describes the preparation and characterization of new PILC materials with mixed pillars of Cr3+ and Al3+ intercalated between the layers of montmorillonite. Various Cr/Al ratios were studied to obtain the most suitable physicochemical products. The resulting materials showed basal spacing between 2.49 nm and 1.90 nm for air-dried samples and surface areas between 232 and 283 m(2)/g. The pillar structure, thermal stability, surface acidity, and reducing behavior of the pillared clay products were determined using Al-27 n.m.r., X-ray diffraction (XRD), d.t.a, diffuse reflectance spectroscopy (d.r.s.), e.p.r., i.r., NH3-t.p.d, t.p.r. The results suggest that Cr/Al ratios greatly affect the pillar structure, surface area, acidity, and thermal stability of hydroxy-CrAl pillared clay (CrAl-PILC), The pillar in CrAl-PILC with Cr/Al ratio <1 has a Keggin structure similar to that of hydroxy-Al pillared clay (Al-PILC), but the pillar structures of CrAl-PILC with Cr/Al ratio greater than or equal to 1 are large polyoxochromium complexes similar to those of hydroxy-Cr pillared clay. The surface acidity and thermal stability are increased by incorporating aluminum into a chromia pillar. There is relatively strong interaction between chromium and alumina in the pillars, which is enhanced with decreasing Cr/Al ratios. Reduction of the chromium(lll) was made difficult because of the interaction of chromium with alumina. Catalytic behavior responded to Cr/Al ratio, and incorporating Cr(lll) into an alumina pillar increased the kinetic stability and selectivity of the catalyst in the disproportionation of 1,2,4-trimethylbenzene compared with a PILC catalyst containing no chromium. |
| WOS关键词 | CROSS-LINKED SMECTITES ; ALUMINUM-OXIDE ; MONTMORILLONITE ; CATALYSTS |
| WOS研究方向 | Chemistry |
| 语种 | 英语 |
| 出版者 | BUTTERWORTH-HEINEMANN |
| WOS记录号 | WOS:A1995QD24200009 |
| 源URL | [http://cas-ir.dicp.ac.cn/handle/321008/167872]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 作者单位 | CHINESE ACAD SCI,DALIAN INST CHEM PHYS,DALIAN 116023,PEOPLES R CHINA |
| 推荐引用方式 GB/T 7714 | ZHAO, DY,YANG, YS,GUO, XX. SYNTHESIS AND CHARACTERIZATION OF HYDROXY-CRAL PILLARED CLAYS[J]. ZEOLITES,1995,15(1):58-66. |
| APA | ZHAO, DY,YANG, YS,&GUO, XX.(1995).SYNTHESIS AND CHARACTERIZATION OF HYDROXY-CRAL PILLARED CLAYS.ZEOLITES,15(1),58-66. |
| MLA | ZHAO, DY,et al."SYNTHESIS AND CHARACTERIZATION OF HYDROXY-CRAL PILLARED CLAYS".ZEOLITES 15.1(1995):58-66. |
入库方式： OAI收割
来源：大连化学物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。