Full
Outline
Pyrolysis is an important approach for achieving graded conversion of low-rank coal. However, the volatiles generated during this process are rich in oxygenated compounds and heavy components, which lead to low efficiency in direct utilization. Selecting appropriate catalysts for catalytic reforming of large molecules in volatiles can facilitate the upgrading of tar into lighter fractions, thereby simplifying the tar processing flow. This study proposes a tandem catalytic system combining metal oxides and zeolites. Through synergistic catalysis between the two catalysts, the pyrolysis volatiles of lignite are efficiently and selectively converted into light aromatics (such as benzene, toluene, ethylbenzene, xylene, naphthalene, methylnaphthalene, etc.). Simultaneously, pre-cracking effectively removes oxygenated components, reducing carbon deposition on the zeolite and extending the catalyst’s lifespan. Research demonstrates that MgO, a metal oxide with strong alkalinity, significantly enhances the cracking and deoxygenation of volatiles; compared to using ZSM-5 alone, the addition of MgO in the upper layer significantly increases the yield of light aromatics while maintaining the original proportion of liquid products. The total yield of light aromatics rose by approximately 20%, reaching 21.5 mg/g. Furthermore, the incorporation of metal oxides effectively reduces carbon deposition on the zeolite, prolonging the catalyst's lifespan.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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