Hydrodeoxygenation (HDO) of m-cresol using H2 produced by dehydrogenation of n-hexane to hexenes is demonstrated at 673 K over a Pt-WOx/C catalyst at 36 bar. The reaction is possible because deactivation of Pt/C during n-hexane dehydrogenation is greatly suppressed at higher pressures. Flow-reactor measurements of pure n-hexane over Pt/C showed rapid deactivation at 1 bar and 773 K but the catalyst was stable for at least 5 h at 36 bar. While the Pt/C catalyst showed poor activity for HDO of m-cresol, the Pt-WOx/C catalyst was able to utilize the H2 to selectively catalyze m-cresol to toluene, simultaneously pushing the conversion of n-hexane above the equilibrium value that would be achieved in the absence of H2 consumption. To explain the increased stability for alkane dehydrogenation at higher pressures, a microkinetic model of propane dehydrogenation, a surrogate of hexane, was analyzed. The model demonstrates that the coverage of vacancies increases with increasing pressure at the expense of species believed to be coke precursors.

中文翻译：

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使用正己烷脱氢原位生成的 H2 在 Pt-WOx/C 上对间甲酚进行加氢脱氧

使用通过正己烷脱氢生成己烯产生的 H2 对间甲酚进行加氢脱氧 (HDO) 在 673 K 下在 Pt-WOx/C 催化剂上在 36 bar 下得到证明。该反应是可能的，因为在更高的压力下，正己烷脱氢过程中 Pt/C 的失活被大大抑制。纯正己烷在 Pt/C 上的流动反应器测量显示在 1 bar 和 773 K 下快速失活，但催化剂在 36 bar 下稳定至少 5 小时。虽然 Pt/C 催化剂对间甲酚的 HDO 表现出较差的活性，但 Pt-WOx/C 催化剂能够利用 H2 选择性地将间甲酚催化为甲苯，同时推动正己烷的转化率高于平衡值这将在没有 H2 消耗的情况下实现。为了解释高压下烷烃脱氢的稳定性增加，分析了丙烷脱氢（己烷的替代品）的微动力学模型。该模型表明，空位的覆盖范围随着压力的增加而增加，但会牺牲被认为是焦炭前体的物质。