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首页> 外文期刊>Chemical engineering journal >Preparation of hierarchically porous diatomite/MFI-type zeolite composites and their performance for benzene adsorption: The effects of desilication
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Preparation of hierarchically porous diatomite/MFI-type zeolite composites and their performance for benzene adsorption: The effects of desilication

机译：分层多孔硅藻土/ MFI型沸石复合材料的制备及其对苯的吸附性能：脱硅作用

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Hierarchically porous diatomite/MFI-type zeolite composites were prepared by transforming the natural diatomaceous silica into MFI-type zeolite by a vapor-phase transport method, followed by a desilication treatment. The morphology and macroporosity of the diatomite were well preserved in the parent diatomite/MFI-type zeolite composite (Dt/Z). Treatment of Dt/Z by desilication in aqueous 0.2 M NaOH solution at 60 degrees C for 1 h resulted in a mesopore size distribution centered at approximately 7 nm, without significantly altering the macroporosity and microporosity of the resulting composite. Further desilication treatment (10 h) broadened the mesopore size distribution, whereas the macropores sourced from the diatomite support were significantly damaged and a fraction of the micropores was narrowed to approximately 0.49 nm. Under the optimal desilication condition (1 h), the desilication-treated Dt/Z sample (Dt/Z-A(1h)) exhibited a higher adsorption capacity, better affinity, and faster adsorption kinetics toward benzene than the parent Dt/Z, as evaluated via a gravimetric method using an Intelligent Gravimetric Analyzer. The excellent benzene adsorption performance of Dt/Z-A(1h) was attributed both to the increase in porosity and the formation of terminal silanol groups on the surface of newly developed pores after the desilication treatment. (C) 2015 Elsevier B.V. All rights reserved.
机译：多层多孔硅藻土/ MFI型沸石复合材料是通过气相转移法将天然硅藻土二氧化硅转化为MFI型沸石，然后进行脱硅处理而制备的。硅藻土的形态和大孔在母体硅藻土/ MFI型沸石复合材料（Dt / Z）中得到了很好的保留。通过在60°C的0.2 M NaOH水溶液中脱硅处理Dt / Z，在1小时内产生的中孔尺寸分布集中在大约7 nm，而不会显着改变所得复合材料的大孔和微孔。进一步的脱硅处理（10小时）使中孔尺寸分布变宽，而源自硅藻土载体的大孔受到了严重破坏，微孔的一部分缩小至约0.49 nm。在最佳脱硅条件下（1 h），经脱硅处理的Dt / Z样品（Dt / ZA（1h））与母体Dt / Z相比具有更高的吸附容量，更好的亲和力和更快的对苯的吸附动力学。通过使用智能重量分析仪的重量分析方法。 Dt / Z-A（1h）具有优异的苯吸附性能，这归因于孔隙率的增加以及经过脱硅处理后新形成的孔表面上末端硅烷醇基团的形成。 （C）2015 Elsevier B.V.保留所有权利。

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