Bifunctional Co/H‐ZSM‐5 zeolites were prepared by a surface organometallic chemistry grafting route, namely, by the stoichiometric reaction between cobaltocene and the Brønsted acid sites in zeolites. The catalyst was applied to a model reaction of the catalytic hydrodeoxygenation of stearic acid (SA). The cobalt species existed in the form of isolated Co²⁺ ions at the exchange positions after grafting, transformed to CoO species on the surface of the zeolite, stabilized inside the zeolite channels upon calcination in air, and finally reduced by hydrogen to homogeneous clusters of metallic cobalt species approximately 1.5 nm in size. During this process, the Brønsted acid sites of the H‐ZSM‐5 zeolites were preserved with a slightly reduced acid strength. The as‐prepared bifunctional catalyst exhibited an approximately 16 times higher activity for the hydrodeoxygenation of SA (2.11 g_SA g_cat⁻¹ h⁻¹) than the reference catalyst (0.13 g_SA g_cat⁻¹ h⁻¹) prepared by solid‐state ion exchange and a high C₁₈/C₁₇ ratio of approximately 24. The remarkable hydrodeoxygenation performance of the bifunctional Co/H‐ZSM‐5 was owed to the effective synergy between the uniformed metallic cobalt clusters and the Brønsted acid sites in H‐ZSM‐5. The simplified reaction network and kinetics of the SA hydrodeoxygenation catalyzed by the as‐prepared bifunctional Co/H‐ZSM‐5 zeolites were also investigated.

中文翻译：

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双功能Co / H-ZSM-5硬脂酸加氢脱氢制柴油-烷烃催化剂的构建

双功能Co / H-ZSM-5分子筛是通过表面有机金属化学接枝途径制备的，即通过钴茂金属与分子筛中布朗斯台德酸位点之间的化学计量反应制备的。将该催化剂用于硬脂酸（SA）的催化加氢脱氧的模型反应。钴物种以孤立的Co ²⁺形式存在接枝后在交换位置处的离子，转化为沸石表面上的CoO物种，在空气中煅烧后稳定在沸石通道内部，最后被氢还原为大小约为1.5 nm的金属钴物种的均质簇。在此过程中，保留了H‐ZSM‐5沸石的布朗斯台德酸点，但酸度略有降低。所制备的双功能催化剂对SA的加氢脱氧（2.11 g _SA  g _cat ^-1  h ^-1）的活性比通过固相法制备的参比催化剂（0.13 g _SA  g _cat ^-1  h ^-1）高约16倍。态离子交换和高C ₁₈/ C ₁₇比率约为24。双功能Co / H-ZSM-5的显着加氢脱氧性能归因于均匀的金属钴簇与H-ZSM-5中的布朗斯台德酸位之间的有效协同作用。还研究了制备的双功能Co / H-ZSM-5沸石催化的SA加氢脱氧反应的简化反应网络和动力学。