Selective dealkylation of alkyl polycyclic aromatic hydrocarbons towards innovative upgrading process of practical heavy oil
Selective dealkylation of alkyl polycyclic aromatic hydrocarbons towards innovative upgrading process of practical heavy oil
复制标题
烷基多环芳烃选择性脱烷基，实现实用重油的创新升级工艺
DOI：
10.1039/d0cy01590c
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发表时间：
2021
影响因子：
5
通讯作者：
Katada Naonobu
中科院分区：
文献类型：
--
作者：
Nakano Fumiya;Goma Tomohide;Suganuma Satoshi;Tsuji Etsushi;Katada Naonobu
研究了减压蜡油中烷基多环芳烃（APAH）的脱烷基改质工艺。具有弱布朗斯特酸中心和大孔径的负载在氧化铝上的二氧化硅单层（SMA）表现出比无定形二氧化硅-氧化铝和沸石（USY和ZSM-5）更高的活性。SMA几乎完全将APAHs转化为芳烃和烷烃，但少量具有甲基和乙基基团（短链）的APAHs未反应。提出SMA的较大孔径足以使大体积APAH扩散。SMA的脱烷基化反应生成大量的长链烷烃，可用作轻油和燃料煤油、润滑油等。长链烷烃的裂解没有进行，因此几乎不生成轻质烷烃。SMA在反应中吸附烷烃但不形成焦炭，因此表现出连续的脱烷基活性。此外，据透露，SMA的孔径略有影响所形成的烷烃的组成。
The dealkylation of alkyl polycyclic aromatic hydrocarbons (APAHs) in vacuum gas oil (VGO) was studied as a novel upgrading process alternative to conventional processes. A silica-monolayer loaded on alumina (SMA) with weak Brønsted acid sites and large pore size exhibited higher activity than amorphous silica-alumina and zeolites (USY and ZSM-5). The SMA almost completely converted the APAHs into aromatics and alkanes, but a small amount of APAHs with methyl and ethyl groups (short-chain) were unreacted. The larger pore size of the SMA was proposed to be enough for bulky APAHs to diffuse. The dealkylation by the SMA formed large amounts of long-chain alkanes, which can be utilized as light oil and kerosene for fuel, lubricating oil, etc. The cracking of long-chain alkanes did not proceed, and thus scarcely formed lighter alkanes. The SMA in the reaction adsorbed alkanes but did not form coke, and therefore exhibited continuous dealkylation activity. Additionally, it was revealed that the pore size of the SMA slightly affected the composition of the formed alkanes.