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Review on Hydrodesulfurization over Zeolite-Based Catalysts
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-02-22 , DOI: 10.1021/acs.iecr.0c06234 Tian-You Cui 1 , Antony Rajendran 1 , Hong-Xia Fan 1 , Jie Feng 1 , Wen-Ying Li 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-02-22 , DOI: 10.1021/acs.iecr.0c06234 Tian-You Cui 1 , Antony Rajendran 1 , Hong-Xia Fan 1 , Jie Feng 1 , Wen-Ying Li 1
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Concerning the environmental and health problems related to SOx emission, the environmental protection agencies are incessantly tightening the permissible sulfur level in fuels such as gasoline and diesel. This gives a greater challenge for the traditional hydrodesulfurization (HDS), which is quite inefficient for removing refractory sulfur (RS) compounds (e.g., 4,6-dimethyldibenzothiophene). Consequently, the new efficient HDS catalysts for substituting the industrial HDS catalysts (Ni(Co)Mo/Al2O3) have received much attention. Zeolite-containing HDS catalysts are of particular importance because zeolites could alleviate the HDS of RS compounds via isomerization and cracking abilities of their Brønsted acid sites. The microporous zeolites slow down the diffusion of reactants and products, leading to uncontrolled cracking reactions that promote the coke formation and thus deactivate the HDS catalysts. Therefore, the application of zeolite-based catalysts was limited for HDS reactions in the early years. But, due to the introduction of hierarchical porous structure in zeolites, the cracking reactions catalyzed by strong Brønsted acid sites are controlled and uninterrupted molecular diffusion becomes highly possible. As a sequel, a better selectivity and improved HDS efficiency are attainable without any coke formation or with a reduced coke formation. Besides the porosity and acidity of zeolites, the synthetic methods and precursors of zeolite-based HDS catalysts and the mixing of zeolites with other supports like Al2O3 have impacts on the efficiency of zeolite-based HDS catalysts. In this review, all these factors are discussed along with the preparation methods of hierarchical zeolites and tuning methods of zeolite acidity. The process and catalyst details of traditional HDS are briefly explained at the outset. The types of metal active component present in various zeolite-based HDS catalysts and how their properties are influenced by zeolites are also summarized.
中文翻译：
沸石基催化剂的加氢脱硫研究进展
关于与SO x排放有关的环境和健康问题，环境保护机构一直在不断收紧汽油和柴油等燃料中允许的硫含量。这给传统的加氢脱硫（HDS）带来了更大的挑战，传统的加氢脱硫对于去除难处理的硫（RS）化合物（例如4,6-二甲基二苯并噻吩）而言效率非常低。因此，新型高效的HDS催化剂可替代工业HDS催化剂（Ni（Co）Mo / Al 2 O 3）受到了广泛的关注。含沸石的HDS催化剂特别重要，因为沸石可以通过其Brønsted酸位的异构化和裂化能力减轻RS化合物的HDS。微孔沸石减慢了反应物和产物的扩散，导致不受控制的裂化反应，从而促进了焦炭的形成，从而使HDS催化剂失活。因此，在早期，基于沸石的催化剂在HDS反应中的应用受到限制。但是，由于在沸石中引入了分层的多孔结构，由强布朗斯台德酸位点催化的裂化反应得到控制，并且不间断的分子扩散变得非常可能。作为续集，在没有任何焦炭形成或减少的焦炭形成的情况下，可以获得更好的选择性和改进的HDS效率。除沸石的孔隙度和酸性外，还包括沸石基HDS催化剂的合成方法和前体，以及沸石与其他载体（如Al）的混合2 O 3对沸石基HDS催化剂的效率有影响。在这篇综述中，将讨论所有这些因素以及分层沸石的制备方法和沸石酸度的调节方法。首先简要说明了传统HDS的工艺和催化剂细节。还概述了各种基于沸石的HDS催化剂中存在的金属活性成分的类型以及它们的性能如何受到沸石的影响。
更新日期：2021-03-03
中文翻译：
沸石基催化剂的加氢脱硫研究进展
关于与SO x排放有关的环境和健康问题，环境保护机构一直在不断收紧汽油和柴油等燃料中允许的硫含量。这给传统的加氢脱硫（HDS）带来了更大的挑战，传统的加氢脱硫对于去除难处理的硫（RS）化合物（例如4,6-二甲基二苯并噻吩）而言效率非常低。因此，新型高效的HDS催化剂可替代工业HDS催化剂（Ni（Co）Mo / Al 2 O 3）受到了广泛的关注。含沸石的HDS催化剂特别重要，因为沸石可以通过其Brønsted酸位的异构化和裂化能力减轻RS化合物的HDS。微孔沸石减慢了反应物和产物的扩散，导致不受控制的裂化反应，从而促进了焦炭的形成，从而使HDS催化剂失活。因此，在早期，基于沸石的催化剂在HDS反应中的应用受到限制。但是，由于在沸石中引入了分层的多孔结构，由强布朗斯台德酸位点催化的裂化反应得到控制，并且不间断的分子扩散变得非常可能。作为续集，在没有任何焦炭形成或减少的焦炭形成的情况下，可以获得更好的选择性和改进的HDS效率。除沸石的孔隙度和酸性外，还包括沸石基HDS催化剂的合成方法和前体，以及沸石与其他载体（如Al）的混合2 O 3对沸石基HDS催化剂的效率有影响。在这篇综述中，将讨论所有这些因素以及分层沸石的制备方法和沸石酸度的调节方法。首先简要说明了传统HDS的工艺和催化剂细节。还概述了各种基于沸石的HDS催化剂中存在的金属活性成分的类型以及它们的性能如何受到沸石的影响。
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