调整 MgxAlOy-SiO2 上的酸性和碱性特征对乙醇升级为 1,3-丁二烯的影响

IF 5.2 2区 化学 Q1 CHEMISTRY, APPLIED Catalysis Today Pub Date : 2024-08-22 DOI:10.1016/j.cattod.2024.115017
Maynara L.A. Santos, Henrique P. Pacheco, Fabio S. Toniolo
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引用次数: 0

摘要

近年来,乙醇因其通过生物质发酵过程获得的可持续吸引力而备受业界关注。乙醇不仅作为一种强效燃料应用于能源领域,而且将其转化为更高附加值的产品也是一个商业亮点。在这项工作中,我们试图合成一种新的混合催化剂 MgxAlOy-SiO2,以研究其在乙醇升级为一种重要相关产品(尤其是塑料和聚合物行业的产品,即 1,3-丁二烯)过程中的性能。通过调整催化剂中 Mg:Al:Si 的摩尔比,发现其对反应产物的选择性有显著影响。对于 1,3-丁二烯的生产,最佳催化剂组成被确定为 3:1:1,在 723 K 时的选择性为 23%。这种组成提供了大量的酸性和碱性活性位点,酸性位点与碱性位点的密度比为 0.109,其中以中等碱性位点为主。这种排列方式被认为有利于脱氢、缩合和脱水反应,这些反应在整个过程中都起着至关重要的作用。
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Tuning acid and basic features on MgxAlOy-SiO2 impacted ethanol upgrading to 1,3-butadiene

Ethanol has captured a lot of interest from the industry in recent years due to its sustainable appeal, being obtained through the process of biomass fermentation. Not only its application in the energy sector as a potent fuel, but its conversion to higher added value products has been a commercial highlight. In this work, we sought to synthesize a new mixed catalyst MgxAlOy-SiO2 to investigate its performance in the upgrading of ethanol to a product of significant relevance, particularly for the plastics and polymers industry, namely1,3-butadiene. The molar ratio of Mg:Al:Si in the catalyst was tuned, revealing a remarkable impact on the selectivity of the reaction products. For the production of 1,3-butadiene, the optimal catalyst composition was determined to be 3:1:1, exhibiting a selectivity of 23 % at 723 K. This composition offered a favorable amount of acid and basic active sites, indicated by the acid to basic sites density ratio of 0.109, with medium basic sites predominantly represented. This arrangement is believed to have facilitated dehydrogenation, condensation, and dehydration reactions, each playing a crucial role in the overall process.

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来源期刊
Catalysis Today
Catalysis Today 化学-工程:化工
CiteScore
11.50
自引率
3.80%
发文量
573
审稿时长
2.9 months
期刊介绍: Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.
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