Activity of palladium loaded on zeolites in the combustion of methane

Maeda, Hitoshi; Kinoshita, Yuka; Reddy, K. R.; Muto, Koh‐ichi; Komai, Shin-ichi; Katada, Naonobu; Niwa, Miki

doi:10.1016/s0926-860x(97)00117-8

Cited by 50 publications

(26 citation statements)

References 16 publications

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“…From Fig. 4, the apparent reaction orders on methane, oxygen, and water were calculated to be 0.6, 0, and -0.5, respectively, which are in good agreement with the previously reported orders for various zeolite-supported Pd catalysts [10,13]. These values are listed in Table 2 along with a comparison of results from Pd/H-ZSM-5(II), Pd/H-mordenite, and Pd/Hbeta.…”

Section: Methane Combustionsupporting

confidence: 87%

“…In fact, Al content in the zeolite was claimed to be a critical factor affecting the size of supported PdO and thus the combustion activity [10,12,13]. As can be seen in Supplementary Fig.…”

Section: Methane Combustionmentioning

confidence: 94%

“…In fact, considerable effort has been devoted to the search for zeolite-supported Pd catalysts that would exhibit enhanced and stable activity for methane combustion at low-temperature [6][7][8][9][10][11][12][13]. However, most of the studies reported thus far are limited to the use of only several structure types of zeolites including ZSM-5, ferrierite, mordenite, and beta as supports, with the object of elucidating the influence of Al content in the zeolite on the size, structure, and methane combustion activity of Pd species.…”

Section: Introductionmentioning

confidence: 99%

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Methane Combustion over Pd Catalysts Loaded on Medium and Large Pore Zeolites

et al. 2008

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Methane combustion was conducted over Pd catalysts supported on medium (ZSM-5, ferrierite, TNU-9, TNU-10) and large (USY, mordenite, beta) pore zeolites. Among the catalysts studied here, Pd/H-TNU-10 exhibited the highest combustion activity, together with excellent durability in the presence of water vapor. A combination of TEM and Pd K-edge XAFS measurements reveals the formation of highly dispersed PdO particles within the TNU-10 pores. This is also the case of Pd/H-ferrierite, while frequently there are large particles (60-100 Å ) on its outer surface. In contrast, most of PdO on zeolites other than these two medium pore materials were found to exist as aggregated particles ([50 Å ) on their outer crystallite surface. It appears that zeolite structures with intersecting 10-and 8-ring pores may be better supports for stabilizing nanometric PdO particles than those with the uniform 10-ring size or with the 12-ring pore system.

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Section: Methane Combustionsupporting

confidence: 87%

Section: Methane Combustionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Methane Combustion over Pd Catalysts Loaded on Medium and Large Pore Zeolites

et al. 2008

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“…The regular pore structure of zeolites was expected to be beneficial for Pd to remain in the hydrophobic environment [14]. Another advantage of zeolite was that the acid property could be readily tuned by changing the Al concentration.…”

Section: Introductionmentioning

confidence: 99%

Pd loaded on high silica beta support active for the total oxidation of diluted methane in the presence of water vapor

2006

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“…Two major problems have to be solved: the first one is how to control the supported metal nanoparticle size, the secondhow to maintain this size during the catalytic reactions, since under reaction conditions at elevated temperatures metal sintering usually takes place. Porous structures like zeolites provide a mechanism for confining metal clusters in controlled fashion [7][8][9]. In this case the particle size is determined by the size of the zeolite cells.…”

Section: Introductionmentioning

confidence: 99%