Preparation of Pd‐Based Metal Monolithic Catalysts and a Study of Their Performance in the Catalytic Combustion of Methane

Abstract

A series of Pd/SBA-15/Al2O3/FeCrAl and Pd/5 wt% Ce(1-x)Zr(x)O2/SBA-15/Al2O3/FeCrAl (x = 0-1) metal monolithic catalysts were prepared and characterized by various techniques. The catalytic activity and the stability of the catalysts for methane combustion were evaluated. All the catalysts retain the SBA-15 mesoporous structure, with PdO being confined in its channels. The results show that the addition of Ce(1-x)Zr(x)O2 as promoters can improve the activity and stability of the catalysts. The stabilities of the metal monolithic catalysts are much better than those of Pd/ SBA-15 particle catalysts. The catalyst with ZrO2 as promoter exhibits the best activity and stability (T90= 395 degrees C), and the conversion of methane remains constant during the 700 h test.

FeCrAl as a Catalyst Support

“…With Pd/ZrO 2 /SBA-15/Al 2 O 3 on FeCrAl, the methane conversion is complete at 450 °C even after 700 h of operation. 211 At low temperature, the CH 4 oxidation activity increases with the precalcination temperature and washcoat loading as the amount of Al 2 O 3 , the promoter for Pd, changes; Pd/Al 2 O 3 activity was higher than that of Pd/SnO 2 . 212 ZSM-5 with isolated metal ions supported on FeCrAl monoliths promotes heterogeneous−homogeneous reactions.…”

“…ZrO 2 improves the activity and stability of a Pd-based FeCrAl monolithic catalyst. With Pd/ZrO 2 /SBA-15/Al 2 O 3 on FeCrAl, the methane conversion is complete at 450 °C even after 700 h of operation . At low temperature, the CH 4 oxidation activity increases with the precalcination temperature and washcoat loading as the amount of Al 2 O 3 , the promoter for Pd, changes; Pd/Al 2 O 3 activity was higher than that of Pd/SnO 2 …”

Catalytic combustion of methane over Pd/Ce–Zr oxides washcoated monolithic catalysts under oxygen lean conditions

“…The light-off results suggested that there is an optimum Pd content for the monolith catalysts in methane combustion. 32 Furthermore, there was no oxygen consumption when reaction temperature was below 280 C, regardless of the amount of Pd loading. Oxygen consumption began at temperature close to the CH 4 -TPR data on Pd/Al 2 O 3 reported by Baylet et al 31 Since catalyst supported by irreducible ZrO 2 had the lowest ignition temperature, the results implied that metallic Pd may be the active site for the early stage of the reaction.…”

Pd4S/SiO2: A Sulfur-Tolerant Palladium Catalyst for Catalytic Complete Oxidation of Methane

“…Supported PdO catalysts have shown excellent catalytic property in methane oxidation, and currently are under extensive study [11][12][13][14][15][16][17][18]. However, once sulfur species (e.g., H 2 S or SO 2 ) are present in the reaction atmosphere, the poisoning of PdO catalyst which would lead to inactive PdO-SO x is irreversible and the activity of the catalyst cannot be recovered at relatively low temperature [19][20][21][22][23][24][25].…”