Methane Reforming by Carbon Dioxide and Steam Over Supported Pd, Pt, and Rh Catalysts

Masai, Mitsuo; Kado, H.; Miyake, Aya; Nishiyama, Satoru; Tsuruya, Shigeru

doi:10.1016/s0167-2991(09)60500-0

Cited by 34 publications

(13 citation statements)

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“…These results show that K and Rb are preferable to exist in acid sites. Similar conclusion was also reported by Masai et al [27]. They found that Lewis acid sites make the higher dispersion of Pd by the adsorption of the NH 3 and pyridine.…”

Section: Surface Basicity Of the Carbon-supported Rb-k Catalystssupporting

confidence: 89%

Effects of acid treatment on activated carbon used as a support for Rb and K catalyst for C2F5I synthesis and its mechanism

Mao

Wang

Tan

et al. 2011

Journal of Fluorine Chemistry

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Section: Surface Basicity Of the Carbon-supported Rb-k Catalystssupporting

confidence: 89%

Effects of acid treatment on activated carbon used as a support for Rb and K catalyst for C2F5I synthesis and its mechanism

Mao

Wang

Tan

et al. 2011

Journal of Fluorine Chemistry

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“…Addition of MgO notably influences surface properties of the catalyst, including thermal stability of Pd oxides, metallic surface dispersion and particle size, metal sintering and carbon resistances. These surface properties could essentially account for the catalytic performance of the catalysts [8,[14][15][16][17][18][19][20][21][22]62,63]. The XRD results identified that MgO mainly exist as amorphous type on catalysts with Mg loading no more than 7 wt%.…”

Section: Effects Of Additive Mgo On Catalytic Performance Of Pd Catalmentioning

confidence: 96%

“…Among Group VIII metals, Pd shows the strongest ability to activate the C H bond of CH 4 [14], and the C H bond activation is suggested as the elemental reaction step in the reforming process [3]. Supported Pd catalysts, such as Pd/SiO 2 , Pd/Al 2 O 3 and Pd/TiO 2 , have shown high conversion activities of CH 4 and CO 2 at relatively low temperatures (250-700 • C) [15][16][17][18]. On the other hand, deactivation of Pd catalysts is still a problem, caused by coking deposition on their active metal surfaces and by structural transformations, sintering and recombination of the active components under reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

“…␥-Al 2 O 3 is one of the most widely used supports because of its high surface area, good mechanical property and low cost. Its high surface area and surface structure could ideally offer high metallic Pd dispersion [23]. However, strong Lewis acidity of ␥-Al 2 O 3 potentially makes supported Pd particles prone to sintering under high temperature condition, causing carbon deposition and activity loss of catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Role of MgO over γ-Al2O3-supported Pd catalysts for carbon dioxide reforming of methane

Shi

Zhang

2015

Applied Catalysis B: Environmental

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a b s t r a c tA series of Pd/Al 2 O 3 catalysts with varying Mg loading (1, 3, 7 and 10 wt%) were investigated for carbon dioxide reforming of methane. It was observed that the initial catalytic activities and long-term stabilities in terms of both CO 2 and CH 4 conversions increased with increasing Mg content when its loading was below 7 wt%. When Mg content was up to 10 wt%, the initial activity and stability decreased. Moreover, Pd7Mg/Al 2 O 3 displayed the highest H 2 and CO yields. Characterization results conducted on catalysts before and after reaction test demonstrated that MgO mainly presented in amorphous form for catalysts with additive content below 7 wt%; while a fraction of MgO transformed into crystalline form when more additive was introduced to the catalyst. The amorphous MgO significantly enhanced surface metal dispersion, decreased average Pd crystallite size and thus improved resistances against both metal sintering and carbon deposition, which contributed to the enhanced initial activities and long-term stabilities. On the contrary, the crystalline MgO decreased exposed Pd active sites, caused metal sintering and thus led to increased amount of carbon deposition owing to both its negative decoration effect on surface metal and deterioration effect on textural characteristics of support. These factors were responsible for the worse catalytic performance of Pd10Mg/Al 2 O 3 as compared to that of Pd7Mg/Al 2 O 3 .

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“…Although great attention is being paid to the conversion of C 0 2 and CH4 to more valuable compounds, few papers have dealt with the catalytic reaction between C 0 2 and CH4 (2,4,(29)(30)(31)(32)(33), which is commercialized as the Calcor process (29).…”

Section: Catalytic Reaction Between Ch4 and C 02mentioning

confidence: 99%

Activation of CH4 and Its Reaction with CO2 over Supported Rh Catalysts

Erdöhelyi¹,

Cserényi²,

Solymosi³

1993

Journal of Catalysis

397

103

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The dissociation of CH4 and CO,, as well as the reaction between CH4 and CO,, has been investigated over supported Rh in a fixed-bed continuous-flow reactor. The decomposition of methane on rhodium occurred above 423 K, when transient evolution of hydrogen and ethane were observed. The deposition of different kinds of carbon species was established, which led to the termination of the decomposition. The reactivity of surface carbon towards hydrogen exhibited a great variance, and sensitively depended on the conditions of its formation. The dissociation of CO, was detected by infrared spectroscopy only above 523 K, and it was promoted by the presence of CH4. The reaction between CO, and CH4 proceeded rapidly above 673 K to give CO and H, with different ratios. No decay in the activity of Rh catalysts was experienced, and only very little, if any, carbon deposition was observed. The effects of different supports on all of the above processes have been examined.

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Methane Reforming by Carbon Dioxide and Steam Over Supported Pd, Pt, and Rh Catalysts

Cited by 34 publications

References 0 publications

Effects of acid treatment on activated carbon used as a support for Rb and K catalyst for C2F5I synthesis and its mechanism

Effects of acid treatment on activated carbon used as a support for Rb and K catalyst for C2F5I synthesis and its mechanism

Role of MgO over γ-Al2O3-supported Pd catalysts for carbon dioxide reforming of methane

Activation of CH4 and Its Reaction with CO2 over Supported Rh Catalysts

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