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Highly Active and Stable Lanthanum‐doped Core–Shell‐structured Ni@SiO 2 Catalysts for the Partial Oxidation of Methane to Syngas
Author(s) -
Li Lei,
Yao Yao,
Sun Bo,
Fei Zhaoyang,
Xia Hao,
Zhao Jing,
Ji Weijie,
Au ChakTong
Publication year - 2013
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201300537
Subject(s) - catalysis , syngas , lanthanum , x ray photoelectron spectroscopy , partial oxidation , non blocking i/o , materials science , methane , chemical engineering , inorganic chemistry , temperature programmed reduction , lanthanum oxide , doping , chemistry , organic chemistry , optoelectronics , engineering
The nanostructures of silica‐encapsulated NiO nanoparticles (NPs) doped with La, Ce, Ba, Co, Cu, and Fe were prepared and tested as catalysts for the partial oxidation of methane to syngas. Techniques that include TEM, XRD, Brunauer–Emmett–Teller (BET), X‐ray photoelectron spectroscopy (XPS), H 2 temperature‐programmed reduction (TPR), and O 2 temperature‐programmed oxidation (TPO) were employed to characterize the fresh and used catalysts to understand the structure–performance relationship. The La‐doped Ni@SiO 2 catalyst is superior to those doped with other elements. The effect of the reaction conditions on the catalyst performance over the best catalyst were also studied. The La 2 O 3 species that were distributed uniformly throughout the NiO or Ni cores not only modify the core surfaces, but also enhance the resistance toward surface coking, which results in superior catalyst activity and durability.