Effect of P sources on the phosphorus modified MCM-22 for n-hexane catalytic cracking
| Autor: | Biao Jiang, Bing Feng, Mengting Guo, Shuhao Bao, Bo Liu, Dongguang Yin, Hong Zhao |
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| Rok vydání: | 2020 |
| Předmět: |
010405 organic chemistry
Chemistry Phosphorus chemistry.chemical_element 010402 general chemistry Fluid catalytic cracking 01 natural sciences Catalysis 0104 chemical sciences law.invention chemistry.chemical_compound Adsorption law Calcination Tributylphosphine Physical and Theoretical Chemistry Zeolite Phosphoric acid Nuclear chemistry |
| Zdroj: | Reaction Kinetics, Mechanisms and Catalysis. 132:431-447 |
| ISSN: | 1878-5204 1878-5190 |
| DOI: | 10.1007/s11144-020-01903-8 |
| Popis: | In this study, phosphoric acid (PA), tributylphosphine (TBP) and phenylphosphonic acid (PPA) were chosen as the P sources to modify MCM-22 through incipient impregnation followed by calcination. The acidity, Al distribution and structure of modified samples were characterized by XRD, N2 physical adsorption, NH3-TPD, 31P MAS NMR, 27Al MAS NMR and XPS. Their catalytic performance upon cracking of n-hexane was also examined. The experimental results demonstrated that all the phosphorus modified samples showed a better catalytic life than that of the parent MCM-22, which can be attributed to acidity reduction and changes in Al distribution. However, the destruction of structure during modification will make the extension of lifetime insignificant. Among all the P sources, TBP/MCM-22, with the lowest acid and the smallest amount of Al content in the T2 sites but the least destruction of zeolite structure, exhibited the best stability and over 70% conversion with time on stream of 35 h. |
| Databáze: | OpenAIRE |
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