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首页> 外文会议>Annual international Pittsburgh coal conference >Upgrading of Lignite Pyrolysis Tar by Catalytic Cracking over Different Mo-loaded HZSM-5 Catalysts
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Upgrading of Lignite Pyrolysis Tar by Catalytic Cracking over Different Mo-loaded HZSM-5 Catalysts

机译：钼负载的HZSM-5催化剂上催化裂化改性褐煤热解焦油

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Lignite is a low-rank coal with high content of volatile matter, which is beneficial to produce value-added chemicals by way of pyrolysis. However, lignite pyrolysis tar (LPT) often generally has very complex compositions with high fractions of heavy components and heteroatomic compounds especially oxygenates. In many cases, these compositions are undesirable because they have several negative impacts on the qualities of LPT. The catalytic cracking of LPT is perceived as an effective approach to upgrade LPT. In the present work, the experiment was carried out using a two-stage reactor. The volatile matter derived from the lignite pyrolysis in the first reactor was allowed to be subjected to the catalytic cracking in the second reactor. Four different catalysts were used to investigate their catalytic effects, including HZSM-5 without loaded metal (ori-HZSM-5), Mo-loaded HZSM-5 without sulfidation (unsulfided-Mo-HZSM-5), Mo-HZSM-5 sulfided in a stream of H_2S/N_2 gas (half-sulfided Mo-HZSM-5) and Mo-HZSM-5 sulfided in a stream of H_2S/H_2 (sulfided HZSM-5). With HZSM-5, the yields of BTXEN (benzene, toluene, xylene, ethylbenzene and naphthalene) reached a maximum of 1.26 wt.% (dry lignite) at the cracking temperature of 550 °C, in the order of fourfold the yield obtained without catalyst (only thermal cracking at the same temperature). This catalyst also distinctly showed the effect on the deoxygenation of LPT, resulting in increases in the yields of C0_2, CO and H_2O, accompanied by the reductions in the yields of oxygenates such as acetic acid and phenols. The yield of hydrocarbon gases C_2H_4 obtained with ori-HZSM-5 exhibited obvious increase compared to the yield obtained without catalyst. Unsulfided Mo-HZSM-5 and half-sulfided Mo-HZSM-5 showed a close catalytic effect. These two catalysts were somewhat better than ori-HZSM for the production of BTXEN. Sulfided Mo-HZSM-5 had excellent performance in the production of BTXEN and the yields of BTXEN achieved 1.63 wt.% (dry coal) at cracking temperature of 550°C.
机译：褐煤是挥发性物质含量高的低级煤，有利于通过热解生产增值化学品。然而，褐煤热解焦油（LPT）通常通常具有非常复杂的组成，具有高比例的重组分和杂原子化合物，尤其是含氧化合物。在许多情况下，这些组合物是不希望的，因为它们对LPT的质量有若干负面影响。 LPT的催化裂化被认为是升级LPT的有效方法。在目前的工作中，使用两级反应器进行了实验。在第一反应器中使源自褐煤热解的挥发性物质在第二反应器中经历催化裂化。四种不同的催化剂用于研究其催化效果，包括不带负载金属的HZSM-5（ori-HZSM-5），不带硫化钼的Mo负载HZSM-5（未硫化的Mo-HZSM-5）和Mo-HZSM-5硫化在H_2S / N_2气流（半硫化的Mo-HZSM-5）中硫化，在Mo_2H / H_2气流（硫化的HZSM-5）中硫化的Mo-HZSM-5。使用HZSM-5，在550°C的裂解温度下，BTXEN（苯，甲苯，二甲苯，乙苯和萘）的产率最高为1.26 wt。％（干褐煤），是不使用BTXEN的产率的四倍。催化剂（仅在相同温度下热裂解）。该催化剂还清楚地显示出对LPT的脱氧的作用，导致CO 2，CO和H_2O的产率增加，伴随着诸如乙酸和苯酚的含氧化合物的产率降低。与没有催化剂获得的产率相比，由ori-HZSM-5获得的烃类气体C_2H_4的产率显示出明显的增加。未硫化的Mo-HZSM-5和半硫化的Mo-HZSM-5表现出密切的催化作用。这两种催化剂在生产BTXEN方面都比ori-HZSM好一些。硫化的Mo-HZSM-5在BTXEN的生产中具有优异的性能，在550℃的裂解温度下BTXEN的收率达到1.63 wt。％（干煤）。

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