The support effect on platinum catalyst under oxidizing atmosphere: improvement in the oxidation-resistance of platinum by the electrophilic property of support materials

Yazawa, Yoshiteru; Yoshida, Hisao; Hattori, Tadashi

doi:10.1016/s0926-860x(02)00323-x

Cited by 102 publications

(75 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4), it might be considered that fine particles are preferable for CH 4 combustion in the low temperature region, whereas large particles in the high temperature region. It is reported that the propane combustion activity decreased with increasing the Pt dispersion over the catalyst supported on metal oxides [23,24]. This implies that the reaction is structure-sensitive, i.e., the larger platinum particles are favorable for the propane combustion.…”

Section: Catalytic Activitiesmentioning

confidence: 99%

Pt-Al2O3 Cryogel with High Thermal Stability for Catalytic Combustion

Osaki¹,

Nagashima²,

Tajiri³

2007

Catal Lett

View full text Add to dashboard Cite

The cryogel catalyst of platinum on alumina was prepared from aluminum sec-butoxide and H 2 PtCl 6 through the sol-gel technique and subsequent freeze drying. The cryogel catalyst showed higher thermal stability of platinum than the corresponding xerogel or impregnation catalysts, which was ascribed to the more intimately developed platinum-alumina interaction accompanied by the encapsulation of the metal into the alumina cryogel. It was also shown that platinum accessibility was higher on the cryogel than on the xerogel despite the higher thermal stability of the metal on the formed than on the latter. For the VOC combustion, the cryogel exhibited higher activity than the xerogel and impregnation catalysts. Also for the methane combustion the cryogel showed higher activity, although it showed lower activity than the impregnation catalysts above 600°C. By the addition of ceria as an additive to the cryogel catalyst, the CH 4 combustion activity was improved especially in the temperature region above 600°C.

show abstract

Section: Catalytic Activitiesmentioning

confidence: 99%

Pt-Al2O3 Cryogel with High Thermal Stability for Catalytic Combustion

Osaki¹,

Nagashima²,

Tajiri³

2007

Catal Lett

View full text Add to dashboard Cite

show abstract

“…Ishikawa et al [19] explained a high catalytic activity for propane combustion over Pt catalysts supported on solid superacids by the strong surface acidity of the support. Propane combustion over Pt catalysts on various supports, viz., MgO [11], Al 2 O 3 [11], SiO 2 -Al 2 O 3 [11,20], WO 3 [13], zeolite [21,22], TiO 2 -SiO 2 [23], and V 2 O 5 -Al 2 O 3 [7] has been examined. It has been reported that the activities of Pt catalysts on supports having high acidities was superior to those of Pt catalysts on supports having lower acidities, because the surface acidity of a support was considered to be a factor in the changing of the oxidation state of Pt [11,12,20,21,24].…”

Section: Introductionmentioning

confidence: 99%

Propane combustion over supported Pt catalysts

et al. 2011

View full text Add to dashboard Cite

We prepared Pt catalysts supported on various metal oxides, viz., ZrO 2 , CeO 2 , TiO 2 , yttria-stabilized zirconia (YSZ), SiO 2 , SiO 2 -Al 2 O 3 , and c-Al 2 O 3 , using an incipient wetness method and applied them to propane combustion. In the cases of ZrO 2 -, CeO 2 -, and TiO 2 -supported Pt catalysts, supports with different surface areas were also used. The Pt dispersion in Pt catalysts supported on metal oxides increased with increasing surface area of the support for the same metal oxide. Pt catalysts on supports with lower surface areas (ZrO 2 , CeO 2 , and TiO 2 ) showed higher catalytic activities for propane combustion than did Pt catalysts on supports with higher surface areas. The catalytic activity decreased in the following order: Pt/ZrO 2 (2) [ Pt/CeO 2 (9) [ Pt/TiO 2 (1) = Pt/SiO 2 (350) [ Pt/ZrO 2 (18) = Pt/YSZ [ Pt/ TiO 2 (330) [ Pt/SiO 2 -Al 2 O 3 (350) [ Pt/ZrO 2 (73) [ Pt/c-Al 2 O 3 (180) [ Pt/CeO 2 (160). The catalytic activity is inversely proportional to the amount of O 2 chemisorbed up to the reaction temperature. It can be concluded that metallic Pt is essential for propane combustion and is maintained for the Pt catalysts with large Pt metal particles, which can be prepared by using a support with a low surface area.

show abstract

“…Many researchers reported ''structure-sensitiveness'' of the reaction in the case of methane combustion over supported metal catalysts [1,2,14,15]. Yazawa et al [16] reported that propane combustion over Pt catalysts was structure-sensitive in which the turnover frequency increased with an increase in acid strength of support materials and a decrease in platinum dispersion.…”

Section: Introductionmentioning

confidence: 99%