Abstract
In this work, we discuss the problem of the afterburning of methane from the exhaust gases of automobile engines fueled by natural gas. In exhaust neutralizers, the PdO/Al2O3 catalyst, the main drawback of which is the reduction of its activity under the action of steam that always present in exhaust gases, is commonly used. To improve the tolerance to steam, a series of PdO-Me x O y /Al2O3 binary catalysts (Me is Co, Cu, Fe, Ni, Mn, or Sn) was prepared and studied. Comparative tests under conditions modeling the methane afterburning process in automobile neutralizers show that Pd catalysts promoted with nickel, cobalt, and tin oxides are more resistant to the inhibiting action of steam. The high crystallinity of supported PdO and its uniform distribution over the surface of modified Al2O3 are indicated as criteria for the stability of catalysts in the presence of steam. Optimization of the concentration of promotors and the preparation method used for their introduction allows the deactivation of Pd catalysts under the action of steam to be almost completely eliminated.
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Original Russian Text © M.A. Mashkovtsev, A.K. Khudorozhkov, I.E. Beck, A.V. Porsin, I.P. Prosvirin, V.N. Rychkov, V.I. Bukhtiyarov, 2011, published in Kataliz v Promyshlennosti.
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Mashkovtsev, M.A., Khudorozhkov, A.K., Beck, I.E. et al. Selection of modifying additives for improving the steam tolerance of methane afterburning palladium catalysts. Catal. Ind. 3, 350–357 (2011). https://doi.org/10.1134/S2070050411040052
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DOI: https://doi.org/10.1134/S2070050411040052