在介孔镓-MFI 沸石催化快速热解过程中增强纤维素和聚丙烯在石化生产中的协同作用,Energy & Fuels

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在介孔镓-MFI 沸石催化快速热解过程中增强纤维素和聚丙烯在石化生产中的协同作用
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-11-18 , DOI: 10.1021/acs.energyfuels.1c02627
Xiangyu Li ₁ , Yongqiang Pang ₁ , Zheng Ding ₁ , Jian Li ₂ , Xingyi Jiang ₁ , Yanbo Luo ₁ , Hongfei Zhang ₁ , Fengpeng Zhu ₁ , Yujue Wang ₃

Affiliation

在木质纤维素生物质与沸石催化剂的催化快速热解 (CFP) 过程中，共进料塑料废物被认为是提高芳烃产量和减少焦炭形成的一种有吸引力的方法。然而，在使用常规 ZSM-5 沸石进行 CFP 过程中，纤维素和聚丙烯 (PP) 的共进料 CFP 对芳烃生产的协同效应微不足道。在这项研究中，通过碱处理（DS-ZSM-5）对常规ZSM-5沸石脱硅和加或不加后处理的镓铝硅酸盐水热合成制备了一系列介孔ZSM-5和含镓（Ga）的MFI沸石。碱处理（GaMFI 和 DS-GaMFI）。然后测试这些沸石的纤维素和 PP 混合物的共进料 CFP。结果表明，微孔MFI沸石通过碱处理产生中孔可以减轻PP衍生支链烯烃对其催化转化的空间位阻效应，而Ga的掺入可以显着提高沸石的脱氢活性，从而提高沸石的脱氢活性。烷烃和烯烃转化为芳烃。因此，与传统的 ZSM-5 沸石相比，这些沸石在共进料 CFP 过程中显着增强了纤维素和 PP 对芳烃生产的协同作用。芳烃产率从 ZSM-5 的 32.9 C% 分别显着增加到 DS-ZSM-5、GaMFI 和 DS-GaMFI 沸石的 40.9 C%、47.9 C% 和 52.7 C%。同时，在使用 DS-ZSM-5 和 DS-GaMFI 沸石共同进料 CFP 期间，不希望的焦炭的形成得到适度缓解。

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Enhancing the Synergistic Effect of Cellulose and Polypropylene for Petrochemical Production during Catalytic Fast Pyrolysis by Mesoporous Gallium-MFI Zeolites

Co-feeding plastic waste has been considered to be an attractive method to enhance aromatic production and mitigate coke formation during catalytic fast pyrolysis (CFP) of lignocellulosic biomass with zeolite catalysts. However, insignificant synergistic effects for aromatic production have been observed for the cofeed CFP of cellulose and polypropylene (PP) during CFP with the conventional ZSM-5 zeolites. In this study, a series of mesoporous ZSM-5 and gallium (Ga)-containing MFI zeolites were prepared by desilication of conventional ZSM-5 zeolite with alkaline treatment (DS-ZSM-5) and hydrothermal synthesis of galloaluminosilicate with or without post-alkaline treatment (GaMFI and DS-GaMFI). These zeolites were then tested for the cofeed CFP of cellulose and PP mixture. The results indicate that the generation of mesopores in microporous MFI zeolite by alkaline treatment can alleviate the steric hindrance effect of PP-derived branched olefins on their catalytic conversion, while the incorporation of Ga can considerably increase the dehydrogenation activity of the zeolites, thus enhancing the transformation of alkanes and olefins to aromatics. Therefore, these zeolites considerably enhanced the synergistic effect of cellulose and PP for aromatic production during the cofeed CFP, compared to the conventional ZSM-5 zeolite. The aromatic yield increased markedly from 32.9 C% for ZSM-5 to 40.9 C%, 47.9 C%, and 52.7 C% for the DS-ZSM-5, GaMFI, and DS-GaMFI zeolites, respectively. Meanwhile, the formation of undesired coke was moderately mitigated during cofeed CFP with the DS-ZSM-5 and DS-GaMFI zeolites. The results of this study demonstrate that the DS-GaMFI zeolite can provide an effective catalyst to enhance aromatic production in the cofeed CFP of lignocellulosic biomass and plastics.

更新日期：2021-12-02

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