物理化学学报 >> 2017, Vol. 33 >> Issue (7): 1310-1323.doi: 10.3866/PKU.WHXB201704172

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镍族金属团簇在催化加氢过程中的应用

韩波,程寒松*()   

  • 收稿日期:2016-12-12 发布日期:2017-05-31
  • 通讯作者: 程寒松 E-mail:chghs2@gmail.com
  • 作者简介:HAN Bo is an Associate Professor of Chemistry at China University of Geosciences Wuhan. His current research interests focus on computational chemistry and materials, including surface chemistry, energy materials, homogeneous and heterogeneous catalysis|CHENG Han-Song is a Professor of Chemistry at China University of Geosciences Wuhan. In 2009, he was inducted into the "National 1000 Talents Plan" program in China and has served as the director of Sustainable Energy Laboratory at the university since then. His research interest lies in the area of first principles simulations and experimental development of novel materials for gas storage and separation, catalysis, battery electrolytes, and proton exchange membrane fuel cells. He is an author of over 200 peer-reviewed publications and an inventor of over 50 U.S. patents and patent applications
  • 基金资助:
    国家自然科学基金(21473164);国家自然科学基金(21203169);国家自然科学基金(21233006);中国地质大学（武汉）中央高校基本科研业务费以及空气与化学品公司资助

Nickel Family Metal Clusters for Catalytic Hydrogenation Processes

Bo HAN,Han-Song CHENG*()   

  • Received:2016-12-12 Published:2017-05-31
  • Contact: Han-Song CHENG E-mail:chghs2@gmail.com
  • Supported by:
    the National Natural Science Foundation of China(21473164);the National Natural Science Foundation of China(21203169);the National Natural Science Foundation of China(21233006);the Fundamental Research Funds for the Central Universities, China University of Geosciences, China, and Air Products and Chemicals, Inc

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摘要：

贵金属纳米颗粒具有优异的催化活性，是异相催化反应中的重要角色。作为一种理想的研究模型，气相金属团簇被广泛应用于在原子和分子尺度探究催化反应的机理。在本专论中，我们将本课题组近年来关于氢气在镍族金属团簇上的解离吸附进行了回顾。首先，我们对比了不同金属团簇的结构演化规律和相对稳定性。随后，我们系统研究了H2分子在金属团簇上的解离吸附行为，揭示了不同金属对H―H键的解离能力。为了表征不同金属团簇的催化活性，我们定义了两个关键参数：氢气的解离吸附能（ΔECE）和H原子的连续脱附能（ΔEDE）。结果显示，随着H覆盖度的增大，ΔECE和ΔEDE都呈现显著的下降。由于在实际的催化反应中，氢气总是维持在一定的分压下，这就意味着催化剂金属应该总是处于较高的H覆盖度下。因此，通过处于H饱和状态下的ΔECE和ΔEDE来评估金属团簇的催化能力是合理可行的。我们发现，在饱和H吸附状态下，每一个Pt原子可以容纳4个H原子，而每一个Pd或Ni原子则只能吸附2个H原子。考虑到H原子在这些团簇上的脱附能力相当，Pt团簇相对较高的H吸附量将极大提高其在加氢过程中的催化活性。最后，我们系统研究了带电状态对Pt团簇催化性能的影响规律。结果显示，在H覆盖度较低时，H2分子的解离以及H原子的脱附过程受Pt团簇带电状态的影响较大。在饱和H吸附时，由于大量H原子的吸附，电荷的影响被平均化到每个Pt―H键上，导致ΔECE和ΔEDE都收敛到一个非常小的区域。此外，当团簇的尺寸增大时，其所带的电荷被大量的Pt原子分摊，每个Pt原子仅携带极少的电荷，使得电荷的影响已经可以忽略。

关键词: 团簇, 过渡金属, 催化加氢, 饱和氢吸附, 带电状态, 密度泛函理论

Abstract:

Nanoparticles of precious metals play an important role in many heterogeneous catalytic reactions due to their excellent catalytic performance. As an idealized model, gas phase metal clusters have been extensively utilized to understand catalytic mechanisms at a molecular level. Here we provide an overview of our recent studies on H2 dissociative chemisorption on nickel family clusters. The structure evolution and the stability of the metal clusters were first compared. H2 dissociation on the clusters was then carefully addressed to understand the capability of metal clusters to break the H-H bond. Two key parameters, the dissociative chemisorption energy (ΔECE) and the H sequential desorption energy (ΔEDE), were employed to characterize the catalytic activity of metal clusters. Our results show that both ΔECE and ΔEDE decline significantly as the H coverage increases. Since the catalyst is in general covered entirely by H atoms and H2 molecules in a typical hydrogenation process, and maintained at a pre-determined pressure of H2 gas, we can rationally use the calculated ΔECE and ΔEDE values at full H saturation to address the activity of metal clusters. Our results suggest that at full H coverage, each Pt atom is essentially capable of adsorbing 4 H atoms, while each Ni or Pd atom can only accommodate 2 H atoms. Considering the similar values of H desorption energies on Pt and Pd clusters, the higher average H capacity per Pt atom could probably lead to a faster reaction rate because more active H atoms are produced on the Pt catalyst particles in the hydrogenation process. Finally, the charge sensitivity of the key catalytic properties of Pt clusters for hydrogenation was systematically evaluated. The results show that the dissociation of H2 and H desorption are strongly correlated to the charge state of the Pt clusters at low H coverage. However, at high H-capacities, both ΔECE and ΔEDE fall into a narrow range, suggesting that the charge can be readily dispersed and that the Pt-H bonds average the interaction between clusters and H atoms. As a result, the H-capacities on charged clusters were found to be similar as the cluster size increased; in case of sufficiently large clusters, the reactivity of a fully saturated cluster was no longer sensitive to its charge state.

Key words: Clusters, Transition metal, Catalytic hydrogenation, Full H saturation, Charge state, Density functional theory