Control of Framework Aluminum Distribution in MFI Channels on the Catalytic Performance in Alkylation of Benzene with Methanol,Industrial & Engineering Chemistry Research

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Control of Framework Aluminum Distribution in MFI Channels on the Catalytic Performance in Alkylation of Benzene with Methanol
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-09 , DOI: 10.1021/acs.iecr.0c00366
Yilin Wang ₁ , Xuan He ₁ , Fan Yang ₁ , Zhaojie Su ₁ , Xuedong Zhu ₁

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Framework aluminum (Al_F) has a correlative relationship with the acid sites in a zeolite, which has been regarded as the key point during the adsorption behavior in alkylation of benzene with methanol. Here, the Al_F distribution in HZSM-5 channels was successfully controlled by different pore-filling agents and organic structure-directing agents (OSDAs) in the synthesis step. HZSM-5 samples with Al_F preferentially located in the intersections and sinusoidal/straight channels were synthesized using tetrapropylammonium hydroxide and pentaerythritol with Na cations as an OSDA and a pore-filling agent, respectively. Catalytic performances in alkylation of benzene with methanol showed that HZSM-5 zeolite with Al_F sitting in the channel and channel intersections generated a coadsorption effect yielding higher benzene conversion, xylene selectivity, and catalytic stability in this reaction. Meanwhile, HZSM-5 zeolite with more Al_F located particularly in the sinusoidal channel exhibited better shape selectivity to the para-xylene product.

中文翻译：

MFI通道中骨架铝分布对苯与甲醇烷基化催化性能的控制

骨架铝（Al _F）与沸石中的酸位具有相关关系，这已被认为是苯与甲醇烷基化的吸附行为中的关键点。在此，在合成步骤中，通过不同的孔填充剂和有机结构定向剂（OSDA）成功控制了HZSM-5通道中的Al _F分布。分别使用氢氧化钠四阳离子铵和季戊四醇钠阳离子作为OSDA和孔填充剂，合成了Al _F优先位于交叉点和正弦/直通道的HZSM-5样品。HZSM-5分子筛与Al _F的苯甲醇催化烷基化反应性能在通道和通道交叉点处的碳纳米管产生共吸附作用，从而在该反应中产生更高的苯转化率，二甲苯选择性和催化稳定性。同时，具有更多Al _F的HZSM-5沸石，特别是在正弦形通道中，对对二甲苯产物表现出更好的形状选择性。

更新日期：2020-07-29

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