Cyclopentanone (CP), a cyclic hydrocarbon, is a potential biobased platform chemical for the synthesis of high-density jet fuel range cycloalkanes. The base-catalyzed self-condensation of CP yields 2-cyclopentylidene cyclopentanone (2-CP) and 2,5-dicyclopentylidene cyclopentanone (3-CP). 2-CP has applications in fuels, fragrances, and flavors, and 3-CP is used as a precursor for diesel-grade products. In this study, solid base activated carbon monolith (ACM)-supported hydrotalcite catalysts (HT/ACM) were synthesized using traditional thermal calcination, rehydration, and air plasma techniques and demonstrated for continuous cyclopentanone self-condensation. Among the ACM-supported hydrotalcites, the HT/ACM activated by air plasma at 100 W for 1 min (PHT/ACM-100W) displayed a higher 2-CP space time yield of 641 g L-cat^–1 h^–1 and selectivity of 27% (220 °C, 1 atm, 0.73 min vapor phase contact time). PHT/ACM-100W displayed a higher CP conversion (42%) compared to the unsupported calcined (34%, 500 °C for 4 h) and rehydrated (39.5%, 8 h at 105 °C) hydrotalcite catalysts yet significantly lower space time yields, suggesting low hydrotalcite distribution and loading on the carbon monolith. The plasma-activated carbon monolith-supported hydrotalcite catalysts synthesized in this work are promising alternatives to the thermally activated and rehydrated hydrotalcites for the catalytic upgrading of biobased cyclic and linear ketones.

中文翻译：

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用于连续合成高密度航空燃料前体的等离子体活化固体碱碳整体催化剂


环戊酮 (CP) 是一种环状烃，是一种潜在的生物基平台化学品，用于合成高密度喷气燃料系列环烷烃。 CP的碱催化自缩合生成2-亚环戊基环戊酮(2-CP)和2,5-二亚环戊基环戊酮(3-CP)。 2-CP 可用于燃料、香料和香料，3-CP 用作柴油级产品的前体。在这项研究中，采用传统的热煅烧、再水化和空气等离子体技术合成了固体碱活性炭整体（ACM）负载的水滑石催化剂（HT/ACM），并证明了其连续环戊酮自缩合。在 ACM 负载的水滑石中，100 W 空气等离子体激活 1 分钟的 HT/ACM (PHT/ACM-100W) 显示出更高的 2-CP 时空产率，为 641 g L-cat ^–1 h ^–1 且选择性为 27%（220 °C，1 atm，0.73 分钟气相接触时间）。与无载体的煅烧（34%，500 °C 4 小时）和再水化（39.5%，105 °C 8 小时）水滑石催化剂相比，PHT/ACM-100W 显示出更高的 CP 转化率 (42%)，但时空时间显着缩短产率，表明水滑石分布和碳整料上的负载量较低。这项工作中合成的等离子体活化碳整体负载水滑石催化剂是热活化和再水合水滑石的有前途的替代品，用于生物基环状和线性酮的催化升级。