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首页> 外文期刊>Catalysis science & technology >Highly robust and efficient MnZnFe2O4 decorated fibrous KCC-SiO2 catalyst for the synthesis of light olefins from syngas
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Highly robust and efficient MnZnFe2O4 decorated fibrous KCC-SiO2 catalyst for the synthesis of light olefins from syngas

机译：高度强大，高效的MnZNFE2O4装饰的纤维KCC-SIO2催化剂，用于合成Syngas的光烯烃

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摘要

The synthesis of light olefin products (C2–C4), including ethylene, propylene and butylene, has gained immense interest due to its importance in the petrochemical industry, as key building blocks to produce important chemicals such as polymers, solvents and drugs. Among the various non-petroleum synthesis approaches, Fischer–Tropsch synthesis (FTS) is considered as the most promising economically and environmentally-benign single process for the conversion of syngas to light olefins, over heterogeneous catalysts. In this study, a straightforward and green sonochemical route is designed and successfully applied to synthesize novel and robust catalysts: bare-MnZnFe2O4 NPs and KCC-SiO2 fibrous nanospheres decorated with MnZnFe2O4 NPs. The prepared catalysts were exposed to industrially relevant FTS reaction and subjected to comprehensive structural and morphological characterization using XRD, SEM/TEM, EDS mapping, N2-BET adsorption–desorption, H2-TPR, XPS and Mössbauer spectroscopy analysis. The obtained FTS catalytic results demonstrated that compared with commonly reported iron-based catalysts, the KCC-SiO2/MnZnFe2O4 core/shell NP catalyst displayed a high light olefin C2–C4 selectivity of 64.5% and an olefin/paraffin ratio of 3.4, while the pristine MnZnFe2O4 catalyst exhibited 57% C2–C4 selectivity and an O/P ratio of 7.1. Moreover, the CO conversion significantly improved from 54% for MnZnFe2O4 to a maximum value of 81.5% for the optimized KCC-SiO2-supported MnZnFe2O4 catalyst. Notably, the produced catalysts displayed long-term stability for a period of 500 h while maintaining high FTS catalytic performance, showing potential FTS industrial application. The obtained high FTS activity for the developed KCC-SiO2/MnZnFe2O4 catalyst is discussed in terms of the improved dispersion, textural properties, spinel redox properties and the unique architecture of the silica–spinel interface that facilitates the desorption of light olefins and suppresses the sequential hydrogenation to unfavourable kinds of paraffins.
机译：光烯烃产物（C2 – C4）的合成，包括乙烯，丙烯和丁烯，由于其在石化工业中的重要性而引起了极大的兴趣，因为它是生产重要化学物质（例如聚合物，溶剂和药物）的关键基础。在各种非高甲基合成方法中，Fischer-Tropsch合成（FTS）被认为是在异质催化剂上转化Syngas向光烯烃转化为光烯烃的最有前途和环境范围的单个过程。在这项研究中，设计并成功地用于合成新颖和健壮的催化剂：Bare-MNZNFE2O4 NPS和KCC-SIO2纤维纳米球，并成功地应用了一条直接而绿色的超声途径。制备的催化剂暴露于工业相关的FTS反应中，并使用XRD，SEM/TEM，EDS映射，N2-BET吸附-Desorpotting，H2-TPR，XPS，XPS和Mössbauer光谱分析进行全面的结构和形态表征。获得的FTS催化结果表明，与常见的基于铁的催化剂相比，KCC-SIO2/MNZNFE2O4 CORE/SHELL NP NP催化剂显示出高光烯烃C2 – C4的选择性为64.5％，烯烃/Paraffin比率为3.4，而3.4的含量为3.4。原始的MNZNFE2O4催化剂表现出57％C2 – C4的选择性，O/P比为7.1。此外，优化的KCC-SIO2支持的MNZNFE2O4催化剂的CO转换从MNZNFE2O4的54％显着提高到81.5％的最大值。值得注意的是，产生的催化剂显示长期稳定性为500小时，同时保持高FTS催化性能，显示出潜在的FTS工业应用。讨论了开发的KCC-SIO2/MNZNFE2O4催化剂获得的高FTS活性，以改善的分散体，纹理性能，尖晶石氧化还原性能以及硅旋转的特性以及硅旋转的独特结构，从而促进了光油蛋白的脱附并抑制顺序的脱附氢化为不利的石蜡。

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