文献类型：期刊文献

英文题名：Ce-promoted Ni-NiO small ensemble constrained in an MgO catalyst for efficient hydrogen production through NH3 decomposition

作者：Wang, Zhaohua[1];Tang, Xuan[2];Wang, Maolin[1];Xu, Yao[1];Qin, Xuetao[1];Zhou, Lihui[2];Peng, Mi[1];Dai, Sheng[2];Ma, Ding[1]

机构：[1]Peking Univ, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, New Cornerstone Sci Lab, Beijing 100871, Peoples R China;[2]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2024

卷号：4

期号：5

外文期刊名：CHEM CATALYSIS

收录：WOS:【ESCI(收录号:WOS:001292325200001)】；

基金：This work was financially supported by the National Key R&D Program of China (2021YFA1501100) , the National Natural Science Foundation of China (21725301, 21932002, 21821004, 22202004, and 22376062) , and the China National Petroleum Corporation-Peking Universtiy Strategic Cooperation Project of Fundamental Research. S.D. thanks the Fundamental Research Funds for the Central Universities, Shanghai Rising-Star Program (20QA1402400) and the Science and Technology Commission of Shanghai Municipality (22ZR1415700) . Additional support was provided by the Frontiers Science Center for Materiobiology and Dynamic Chemistry and the Feringa Nobel Prize Scientist Joint Research Center. D.M. acknowledges support from the Tencent Foundation through the XPLORER PRIZE and New Corner-stone Investigator Program. The XAS experiments were performed at the Shanghai Synchrotron Radiation Facility (SSRF) . The authors thank BL10B in NSRL for XPS characterization by Synchrotron Radiation. The Swiss Light Source is acknowledged for beam time at the solid/gas interface end-station of the in situ spectroscopy beamline for the NAP-XPS experiment (proposal 20221640) .

语种：英文

摘要：Ammonia is recognized for its potential in hydrogen storage and transportation. Among methods for hydrogen production from ammonia, catalytic decomposition stands out, and developing economical alternatives to noble metal catalysts like ruthenium (Ru) is crucial. Here, we report an exsolution strategy to obtain a size-constrained Ni0-NiO 0-NiO small ensemble on MgO that outperforms bare Ni single atoms and particles in ammonia decomposition. Adding Ce to the NiMg catalyst significantly enhances activity, doubling the hydrogen production rate to 92 mmolH2 H2 g cat- 1 min- 1 at 550 degrees C, degrees C, surpassing most Ni-based catalysts. Characterization reveals the role of cerium in forming active Ni0-NiO 0-NiO ensembles by occupying specific sites on MgO. Cerium (Ce) also affects hydrogen and ammonia adsorption and alters reaction pathways. Our work highlights the structure control of transition metal sites and the promotion mechanism of rare-earth elements for ammonia conversion and hydrogen production reaction.