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Dissecting ZnOX/Cu interfacial self-encapsulation and methanol-induced strong metal-support interaction of the highly active alloyed CuZn and ZnO for methanol steam reforming
Fuel ( IF 6.7 ) Pub Date : 2023-09-22 , DOI: 10.1016/j.fuel.2023.129840
Aixia Wang , Peng Fu , Qingwen Fan , Yi Wang , Liang Zheng , Song Hu , Jun Xiang , Chaoyun Song

A highly durable non-noble metal catalyst like copper for high-temperature methanol steam reforming is necessary for a compact hydrogen reactor. Herein, deactivation of copper-based catalysts with strong metal-support interaction is extremely sluggish even at 550 °C when using a selective chemical reduction approach paired with various induced activation procedures. The adsorbate methanol could enhance the migration of ZnOx onto the Cu and increase the number and electronic modulation of high-activity CuZn alloy sites. The Zn pre-deposited on the Cu surface induces continuous morphology and structural reorganization of the catalytic surface, which constantly refreshes the catalyst surface. The adsorbate methanol led to abundant CuZn alloy-ZnO synergism, which sped up the dissociation of·HO and the dehydrogenation of *CHO in accordance with the density functional theory and, ultimately, exhibited the highest methanol conversion (99.55 %) and hydrogen yield (97.73 %) compared to the hydrogen induction.

中文翻译:

解析用于甲醇蒸汽重整的高活性合金化 CuZn 和 ZnO 的 ZnOX/Cu 界面自封装和甲醇诱导的强金属-载体相互作用

对于紧凑型氢反应器来说,用于高温甲醇蒸汽重整的高度耐用的非贵金属催化剂(例如铜)是必需的。在此,当使用选择性化学还原方法并结合各种诱导活化程序时,即使在 550 °C 下,具有强金属-载体相互作用的铜基催化剂的失活也极其缓慢。吸附物甲醇可以增强 ZnOx 在 Cu 上的迁移,并增加高活性 CuZn 合金位点的数量和电子调制。预沉积在Cu表面的Zn引起催化表面的连续形貌和结构重组,从而不断刷新催化剂表面。吸附质甲醇产生了丰富的CuZn合金-ZnO协同作用,根据密度泛函理论加速了·H2O的解离和*CHO的脱氢,最终表现出最高的甲醇转化率(99.55%)和氢气产率( 97.73%)与氢诱导相比。
更新日期:2023-09-22
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