Effect of preparation conditions on platinum metal dispersion and turnover frequency of several reactions over platinum-supported on alumina catalysts

Matsuhashi, Hiromi; Nishiyama, Satoru; Miura, Hiroshi; Eguchi, Koichi; Hasegawa, Koji; Iizuka, Yasuo; Igarashi, Akira; Katada, Naonobu; Kobayashi, Junya; Kubôta, Takashi; Mori, Tohru; Nakai, Kenta; Okazaki, Noriyasu; Sugioka, Masatoshi; Umeki, Takashi; Yazawa, Yoshiteru; Lu, Daling

doi:10.1016/j.apcata.2004.06.005

Cited by 39 publications

(18 citation statements)

References 13 publications

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“…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: 95%

Pt-Al2O3 Cryogel with High Thermal Stability for Catalytic Combustion

Osaki¹,

Nagashima²,

Tajiri³

2007

Catal Lett

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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.

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Section: Catalytic Activitiesmentioning

confidence: 95%

Pt-Al2O3 Cryogel with High Thermal Stability for Catalytic Combustion

Osaki¹,

Nagashima²,

Tajiri³

2007

Catal Lett

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“…The TOF of Rh catalysts, except Rh/ZrO2, increased with higher reduction temperature. The TOF of Pt/Al2O3 catalyst for thiophene HDS decreases with lower dispersion of Pt 41) . Therefore, increased TOF of Rh catalysts would be caused by enlargement of the Rh crystalline size, as shown in Table 4.…”

Section: Co Adsorption On Rh/mox and Rh-p/moxmentioning

confidence: 99%

Effects of Support on Formation of Active Sites and Hydrodesulfurization Activity of Rhodium Phosphide Catalyst

Kanda

Nakata

Temma

et al. 2012

J. Jpn. Petrol. Inst.

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The effects of the support on active site formation and hydrodesulfurization (HDS) activity of Rh2P catalyst were examined, using metal oxides (MOx), such as SiO2, TiO2, Al2O3, MgO and ZrO2, as the support. Rh2P was formed on MOx support after reduction of supported rhodium and phosphorus (Rh _ P) catalysts. However, differences in the formation temperatures of Rh2P were observed by changing the MOx support. Furthermore, the HDS activities of the supported Rh _ P catalysts strongly changed with higher reduction temperature. The order of HDS activities of Rh _ P/MOx catalysts reduced at optimal temperatures was SiO2 ~ TiO2 ~ Al2O3 MgO ZrO2. The TOF of Rh _ P/MOx catalysts was enhanced by increasing the reduction temperature to form Rh2P. The order of TOF of supported Rh2P catalysts was TiO2 ZrO2 Al2O3 SiO2 MgO, and this order disagreed with that of thiophene conversion. The high TOF of Rh _ P/TiO2 catalyst may be explained by formation of partially sulfided TiO2 in the HDS reaction. The low TOF of Rh _ P/MgO catalyst was attributed to the basicity of the support with low sulfur tolerance.

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“…Evaluation of the HDS activities of the supported Pt catalysts by turnove r f r e q u e n cy ( TO F ) s h ow e d t h e TO F o f P t / SiO2 Al2O3 catalyst was remarkably higher than those of Pt/SiO2 and Pt/Al2O3 catalysts. The relationship between dispersion of Pt on Al2O3 and TOF is negative in HDS of thiophene 28) . However, this cannot explain why the TOF of Pt/SiO2 Al2O3 catalyst is so high.…”

Section: Ta B L E 3) T H E S E R E S U L T S I N D I C a T E T H A mentioning

confidence: 99%

Catalytic Performance of Noble Metals Supported on Alumina-modified Silica Gel for Hydrodesulfurization Reaction

Kanda¹,

Kobayashi²,

Uemichi³

et al. 2006

J. Jpn. Petrol. Inst.

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Effect of preparation conditions on platinum metal dispersion and turnover frequency of several reactions over platinum-supported on alumina catalysts

Cited by 39 publications

References 13 publications

Pt-Al2O3 Cryogel with High Thermal Stability for Catalytic Combustion

Pt-Al2O3 Cryogel with High Thermal Stability for Catalytic Combustion

Effects of Support on Formation of Active Sites and Hydrodesulfurization Activity of Rhodium Phosphide Catalyst

Catalytic Performance of Noble Metals Supported on Alumina-modified Silica Gel for Hydrodesulfurization Reaction

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