Kinetics study of hydrogen adsorption over Pt/MoO3

Triwahyono, Sugeng; Jalil, Aishah Abdul; Timmiati, Sharifah Najiha; Ruslan, N. N.; Hattori, Hideshi

doi:10.1016/j.apcata.2009.10.024

Cited by 33 publications

(22 citation statements)

References 10 publications

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“…The activity of Pd-Pt/MoO 3 after the heat treatment in N 2 at 150 0 C decreases and like in the first test, it also decreases during the repeated use of the catalyst. The heat evolved in the first and repeated experiments both are the same 364 kJ/ mol H 2 and they are distinctly higher than that evolved in employed is exothermic process similarly to what was previously observed [17,30,31]. The systematic studies reported by Noh et al [30] demonstrated that the kinetics of H-bronze formation is an extremely fast process.…”

Section: Microcalorimetric Experimentssupporting

confidence: 66%

Hydrogen and oxygen reaction on SiO2 and MoO3 supported Pd-Pt catalysts

Lalik¹,

Kołodziej²,

Kosydar³

et al. 2015

Recyclable Catalysis

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Abstract:The thermal effects and activity of SiO 2 and MoO 3 supported bimetallic Pd-Pt catalysts (Pd:Pt = 1) in the exothermic H 2 and O 2 recombination reaction have been investigated in view of their potential use in the passive autocatalytic recombiners (PAR), which are applied at an industrial stage of development in the nuclear plant to lower the explosion risk associated with hydrogen release. The catalysts have been prepared using the colloid-based reverse "water-in-oil" microemulsion method and characterized by BET, XRD, SEM, EDS techniques. The recombination reaction of hydrogen and oxygen has been monitored using Microscal gasflow through microcalorimeter. This technique was also applied to follow hydrogen sorption by the Pd-Pt/ MoO 3 catalyst resulting in the formation of molybdenum bronzes (H X MoO 3 ). The pattern of changes in both the heat evolution and the conversion of hydrogen clearly show much better performance of Pd-Pt/SiO 2 catalyst. On Pd-Pt/ MoO 3 catalyst the conversion of H 2 was lower whereas the amount of evolved heat was higher because of exothermic reaction of bronzes formation. In contrast to Pd-Pt/SiO 2 catalyst offering stable activity, the activity of Pd-Pt/MoO 3 decreased during the catalytic test.

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Section: Microcalorimetric Experimentssupporting

confidence: 66%

Hydrogen and oxygen reaction on SiO2 and MoO3 supported Pd-Pt catalysts

Lalik¹,

Kołodziej²,

Kosydar³

et al. 2015

Recyclable Catalysis

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“…In the cases of carbonbased adsorbents, the formation of CÀH [12][13][14][15] andO À H [16] bonds on the carbon surface may provide such thermodynamic driving force. In the cases of semiconducting metal oxides such as WO 3 , [3,17,18] MoO 3 , [19] TiO 2 , [20] etc., [21] atomic hydrogen can chemically react with the supports to partially reduce the framework as in the case of Khoobiar's WO 3 experiment. [3] After the supports are fully hydrogenated, there would be no remaining thermodynamic driving force and thus hydrogen spillover would not occur any further,i .e.,r eaching an equilibrium of H 2 adsorption capacity in hydrogen storage.…”

Section: Understanding Hydrogen Spillover From a Catalysis Point Of Viewmentioning

confidence: 99%

Hydrogen Spillover in Encapsulated Metal Catalysts: New Opportunities for Designing Advanced Hydroprocessing Catalysts

2015

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Hydrogen spillover has been one of the most debated concepts in the field of heterogeneous catalysis due to limited ways of studying it. The main controversies in hydrogen spillover, especially from the viewpoint of its catalytic functions, can be mainly attributed to the absence of well‐defined model catalysts that can provide direct proof of the catalytic functions of hydrogen spillover. In this article, we will provide an overview of the recent progress made with encapsulated metal catalysts, which can act as an ideal model catalyst for proving the existence and catalytic functions of hydrogen spillover. We will also demonstrate unique opportunities of using the encapsulated metal catalysts for designing advanced hydroprocessing catalysts with enhanced activity, distinct chemoselectivity, and increased catalyst durability.

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“…We have reported the formation of protonic acid sites through hydrogen spillover phenomenon evidenced by ESR and IR studies on the zeolitic-based and zirconia-based catalysts [31,36,37]. In addition, the presence of Pt enhanced the hydrogen uptake capacity of WO 3 -ZrO 2 [35,38], SO 2À 4 -ZrO 2 [39] and also MoO 3 [28] catalysts. Fig.…”

Section: Hydrogen Interactionmentioning

confidence: 88%

“…A catalyst sample was placed in an adsorption vessel and activated in a hydrogen flow at 623 K for 3 h followed by evacuation at 623 K for 3 h. The sample was subsequently cooled to an adsorption temperature and held for 3 h in order to stabilize the temperature [28]. The adsorption temperature was verified from 323 to 573 K. 6.7 kPa of hydrogen gas was then introduced into the adsorption system, and the pressure change was monitored to calculate the hydrogen uptake.…”

Section: Characterization Of Catalystmentioning

confidence: 99%