Lai Xiao-Meng, Xiao Qi, Ma Chao, Wang Wei-Wei, Jia Chun-Jiang
Key Laboratory for Colloid and Interface Chemistry, Key Laboratory of Special Aggregated Materials, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, People's Republic of China.
College of Materials Science and Engineering, Hunan University, Changsha 410082, People's Republic of China.
ACS Appl Mater Interfaces. 2022 Feb 16;14(6):8575-8586. doi: 10.1021/acsami.1c22795. Epub 2022 Feb 5.
The water gas shift (WGS) reaction is a key process in the industrial hydrogen production and the development and application of the proton exchange membrane fuel cell. Metal oxide-supported highly dispersed Pt has been proved as an efficient catalyst for the WGS reaction. In this work, a series of supported 0.5Pt/Ce-10Ti ( = 1, 3, or 5) catalysts with different Ce/Ti molar ratios were prepared by a simple deposition-precipitation method. Compared with single TiO- or CeO-supported Pt catalysts, it was found that the 0.5Pt/3Ce-10Ti catalyst showed an obvious advantage in activity for the WGS reaction. In this catalyst, dispersed CeO nanoparticles were supported on the TiO sheets, and Pt single atoms and nanoparticles were located on CeO and at the boundary of TiO and CeO, respectively. It found that the reduction ability of the supported Pt catalyst was remarkably improved; meanwhile, the adsorption strength of CO on the surface of 0.5Pt/3Ce-10Ti was moderate. The heterostructured CeO-TiO support gave an effective regulation on the Pt status and further influenced the CO adsorption ability, inducing excellent WGS reaction activity. This work provides a reference for the development and application of heterostructured materials in heterogeneous catalysis.
水煤气变换（WGS）反应是工业制氢以及质子交换膜燃料电池开发与应用中的关键过程。金属氧化物负载的高度分散的Pt已被证明是WGS反应的高效催化剂。在本工作中，通过简单的沉积沉淀法制备了一系列具有不同Ce/Ti摩尔比的负载型0.5Pt/Ce - 10Ti（ = 1、3或5）催化剂。与单一TiO或CeO负载的Pt催化剂相比，发现0.5Pt/3Ce - 10Ti催化剂在WGS反应活性方面具有明显优势。在该催化剂中，分散的CeO纳米颗粒负载在TiO片上，Pt单原子和纳米颗粒分别位于CeO上以及TiO和CeO的边界处。发现负载型Pt催化剂的还原能力显著提高；同时，CO在0.5Pt/3Ce - 10Ti表面的吸附强度适中。异质结构的CeO - TiO载体对Pt状态进行了有效调控，并进一步影响了CO吸附能力，从而诱导出优异的WGS反应活性。本工作为异质结构材料在多相催化中的开发与应用提供了参考。
