DEACTIVATION OF NACL/B2O3/FE2O3 CATALYSTS AND THEIR IMPROVEMENT FOR THE OXIDATIVE COUPLING OF METHANE
文献类型：期刊论文
| 作者 | XIA, XR; XIONG, GX; MIAO, Q; GUO, XX |
| 刊名 | CATALYSIS LETTERS
 |
| 出版日期 | 1995 |
| 卷号 | 31期号:2-3页码:183-195 |
| 关键词 | Alkali Chloride Doped Ferrous Oxides Characterization Deactivation Oxidative Activity Oxidative Coupling Of Methane |
| ISSN号 | 1011-372X |
| 文献子类 | Article |
| 英文摘要 | In the present work, the deactivation of the NaCl/B2O3/Fe2O3 catalysts was studied for the oxidative coupling of methane. Several techniques, such as XPS, XRD, SEM, H-2-TPR, and flow-reaction, were employed to examine the function of each catalyst component, and its change during the catalytic reaction. NaCl and B2O3 show a synergistic effect on the Fe2O3 surface. B2O3 modifies the oxidative activity of Fe2O3 and makes the first reduction peak of Fe2O3 shift from 490 to 750 degrees C. The NaCl modified B2O3/Fe2O3 catalyst has high reduction rate, high activity and selectivity at about 750 degrees C. It is demonstrated that the deactivation of the NaCl/B2O3/Fe2O3 catalysts is a complicated process, consisting of chloride loss, sodium change, B2O3 loss, silica deposition and catalyst sintering. The chloride loss enhances the surface basicity, which causes the silica deposition and sodium change, and aggravates the catalyst sintering. The silica deposition and catalyst sintering cause permanent deactivation. The B2O3 loss is not a direct reason for catalyst deactivation. NaCl crystal diluted NaCl/B2O3/Fe2O3 catalysts have a better stability. The deactivated catalyst has a more stable structure. When it is regenerated by impregnating with NaCl again, a more stable catalyst can be obtained. |
| WOS关键词 | EARTH OXIDE CATALYSTS ; ALKALI ; TETRACHLOROMETHANE ; HYDROCARBONS ; PERFORMANCE ; SELECTIVITY ; ETHYLENE ; CHLORINE ; ABSENCE |
| WOS研究方向 | Chemistry |
| 语种 | 英语 |
| WOS记录号 | WOS:A1995QN39800006 |
| 出版者 | BALTZER SCI PUBL BV |
| 源URL | [http://cas-ir.dicp.ac.cn/handle/321008/167830]  |
| 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,STATE KEY LAB CATALYSIS,DALIAN 116023,PEOPLES R CHINA |
| 推荐引用方式 GB/T 7714 | XIA, XR,XIONG, GX,MIAO, Q,et al. DEACTIVATION OF NACL/B2O3/FE2O3 CATALYSTS AND THEIR IMPROVEMENT FOR THE OXIDATIVE COUPLING OF METHANE[J]. CATALYSIS LETTERS,1995,31(2-3):183-195. |
| APA | XIA, XR,XIONG, GX,MIAO, Q,&GUO, XX.(1995).DEACTIVATION OF NACL/B2O3/FE2O3 CATALYSTS AND THEIR IMPROVEMENT FOR THE OXIDATIVE COUPLING OF METHANE.CATALYSIS LETTERS,31(2-3),183-195. |
| MLA | XIA, XR,et al."DEACTIVATION OF NACL/B2O3/FE2O3 CATALYSTS AND THEIR IMPROVEMENT FOR THE OXIDATIVE COUPLING OF METHANE".CATALYSIS LETTERS 31.2-3(1995):183-195. |
入库方式： OAI收割
来源：大连化学物理研究所
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