Qianlong Mao , Zirui Gao , Xiaohui Liu , Yong Guo , Yanqin Wang , Ding Ma
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引用次数: 0
摘要
甲醇蒸汽转化(MSR)是一种方便的原位制氢方法,可拓宽氢能应用领域。确定铜基催化剂在 MSR 中的内在活性并开发更高效的催化剂是应用原位制氢的重要课题。在此,我们开发了一系列不同铜含量的 Al2O3 支持的铜催化剂。在 250 °C 下,10Cu/Al2O3 的最高制氢率为 147.6 μmol g-1 s-1,超过了大多数铜基金属氧化物催化剂。准原位 XPS 和 CO DRIFTS 揭示了 mCu/Al2O3 催化剂中铜电子状态的变化趋势,其中 m 为铜负载量(重量百分比)。同时,原位 DRIFTS 检测到了吸附在界面部位 1602 cm-1 处的中间甲酸盐物种。这种甲酸盐种类(HCOO-CuAl)比吸附在 Al2O3 上的甲酸盐种类(HCOO-Al)更快地解离成 CO2 和 H2。反相 Al2O3/Cu 催化剂进一步证实,Cu-Al2O3 界面在 MSR 中起着至关重要的作用。这项工作确定了铜-氧化物界面是 MSR 的主要活性位点,并为构建高性能催化剂提供了指导。
The Cu–Al2O3 interface: an unignorable active site for methanol steam reforming hydrogen production†
Methanol steam reforming (MSR) is a convenient method for in situ hydrogen production and broadens hydrogen energy application. Identifying the intrinsic activity of Cu-based catalysts for MSR and developing more efficient catalysts is a significant topic for applying in situ hydrogen production. Here, we developed a series of copper catalysts supported by Al2O3 with varying copper contents. The highest hydrogen production rate of 147.6 μmol g−1 s−1 was obtained over 10Cu/Al2O3 at 250 °C, exceeding most copper-based metallic oxide catalysts. Quasi in situ XPS and CO DRIFTS revealed the variation trend of copper's electronic state in mCu/Al2O3 catalysts, where m is the copper loading (in weight percentage). Meanwhile, intermediate formate species adsorbed on the interfacial site at 1602 cm−1 were detected by in situ DRIFTS. This formate species (HCOO–CuAl) dissociated faster to CO2 and H2 than those adsorbed on Al2O3 (HCOO–Al). The inverse Al2O3/Cu catalyst further confirmed that the Cu–Al2O3 interfaces play a crucial role in MSR. This work defines the copper–oxide interface as the main active site in MSR and guides the construction of high-performance catalysts.
期刊介绍:
A multidisciplinary journal focusing on cutting edge research across all fundamental science and technological aspects of catalysis.
Editor-in-chief: Bert Weckhuysen
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