Journal
JOURNAL OF CATALYSIS
Volume 384, Issue -, Pages 122-135Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.01.013
Keywords
Methane; Catalytic combustion; Water vapor resistance; Layered double hydroxides; Structured catalyst
Categories
Funding
- National Natural Science Foundation of China [21773069, 21703069, 21473057]
- Key Basic Research Project from the Shanghai Municipal Science and Technology Commission [18JC1412100]
- National Key Basic Research Program of the Ministry of Science and Technology of the People's Republic of China [2011CB201403]
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Thin-sheet microfibrous-structured Pd-MgO-Al2O3/Al-fiber catalysts were developed for high-throughput catalytic methane combustion with 3-15 vol% water vapor in feed gas. The catalysts were obtained by hydrothermally growing Mg-Al mixed-oxide precursors (e.g., layered double hydroxides (LDHs) plus MgCO3) on Al-fiber surfaces followed by placing 0.5 wt% Pd on the as-obtained substrates by impregnation. Transformation of Pd/MgAl-LDH-MgCO3 mounted on the Al-fiber into Pd-MgO-Al2O3 via in situ reaction activation markedly enhances the catalyst basicity and electron density of metallic Pd, thus weakening support electrophilicity and stabilizing PdO against the formation of inactive Pd4+ species. This preferred catalyst with high intrinsic activity (turnover frequency 135 h(-1) at 290 degrees C and 3 vol% water vapor) achieves a very low Ea of only 57 kJ mol(-1), a third that (170 kJ mol(-1)) for the Pd/AlOOH/Al-fiber. This catalyst can stably run for feed gases of 1 vol% methane and 3-15 vol% water vapor in air. (C) 2020 Elsevier Inc. All rights reserved.
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