Catalytic activity of PdO/ZrO2 catalyst for methane combustion

Effects of CeO2-ZrO2 present in Pd/Al2O3 catalysts on the redox behavior of PdOx and their combustion activity

“…H 2 -TPR profile of Pd/Ce-Zr/Al 2 O 3 catalyst exhibits two peaks of hydrogen consumption at 35 and 102 8C, respectively, and the corresponding H 2 consumption is 53.7 and 10.6 mmol/g cat , and a negative peak at about 90 8C, however, there is no reduction peak of Ce 4+ to Ce 3+ in the range of 180-800 8C. Therefore, the positive peak at 35 8C should be attributed to consumption of hydrogen on the reduction of highly dispersed PdO species, which indicates variation in the distribution of PdO with support composition, while the new reduction peak between 100 and 150 8C may be attributed to a result of the reduction of stable PdO species and of the strong interaction between the PdO x and the Ce-Zr oxides that would promote the reduction of Ce 4+ to Ce 3+ [9,12,22]. From Fig.…”

“…Cerium oxide is a well-known promoter in noble metalbased combustion catalysts [12,13]. But with the temperature improvement, especially higher than 1000 8C, CeO 2 readily sinters at elevated temperatures, resulting in a significant decrease of catalytic activity.…”

Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

“…The supports present (3 1 1) and (1 1 1) planes with interplanar distances of respectively 0.24 and 0.46 nm, characteristic of the structure of NiAl 2 O 4 . A smaller contact angle of the interface also permits matching of the crystal lattices for the Pd and NiAl 2 O 4 phase [47]. This may result in an unusual microstructure and high dispersion of palladium particle, because a strong interaction between the supported particles and the support plays a role in restraining the migration and growth of the particles.…”

APPLICATION OF NEW ZRO2-SBA-15 MATERIALS AS CATALYTIC SUPPORTS: STUDY OF INTRINSIC ACTIVITY OF MO CATALYSTS IN DEEP HDS

“…Furthermore, interest in new applications of ZrO 2 -based materials in catalysis is growing. Zirconia has been successfully tested as a support for noble metals containing catalysts in oxidation of CO (Cioffi et al, 2007), oxidation of methanol to methyl formate (Li et al, 2006), and combustion reactions of toluene (Okumura et al, 2003), methane (Narui et al, 1998), and dimethyl ether (Ishikawa and Iglesia, 2007), among others. As a catalyst, ZrO 2 showed excellent results in the hydrogenation of carboxylic acids to aldehydes (Yokoyama and Yamagata, 2001), CO hydrogenation to isobutane and isobutene (Li et al, 2007), partial oxidation of CH 4 to syngas , and production of nylon-6 from 6-aminocapronitrile (Meuldijk et al, 2007).…”