Dual-template synthesis of HZSM-5 zeolites with tailored activity in toluene methylation with CH3Br
| Autor: | Chak-Tong Au, Lang Chen, Jun Xie, Wu-Hui Wang, Peng Wang, Shuang-Feng Yin |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
General Chemical Engineering Crystal growth 02 engineering and technology General Chemistry Methylation Alkylation 021001 nanoscience & nanotechnology Biochemistry Toluene Catalysis chemistry.chemical_compound Template 020401 chemical engineering chemistry Yield (chemistry) 0204 chemical engineering 0210 nano-technology Selectivity Nuclear chemistry |
| Zdroj: | Chinese Journal of Chemical Engineering. 27:1846-1850 |
| ISSN: | 1004-9541 |
| Popis: | Shape-selective zeolites (HZ-x/y) were synthesized by a one-pot method using TPAOH (y) and/or MeEt3N+ I− (x) as templates. The use of MeEt3N+ I− affects the crystal growth and the distribution of acid sites on the external surface of the zeolites. The catalysts show excellent catalytic activity towards toluene alkylation with CH3Br. With toluene conversion of 36.3% and p-xylene selectivity of 66.2%, HZ-40/0 is the most effective among the prepared catalysts, showing a p-xylene yield of 21.2%. The improved para-selectivity is mainly due to the decrease of acid sites on the external surface of the catalysts. |
| Databáze: | OpenAIRE |
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