Catalytic performance enhancement by heat treatment of CuFe2O4 spinel and γ-alumina composite catalysts for steam reforming of dimethyl ether

Shimoda, Naohiro; Faungnawakij, Kajornsak; Kikuchi, Ryuji; Fukunaga, Tetsuo; Eguchi, Koichi

doi:10.1016/j.apcata.2009.05.049

Cited by 33 publications

(18 citation statements)

References 29 publications

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“…On the other hand, the similar variations are also found for the pore volume and pore diameter, which indicates that the pore structure of the catalysts are affected by the pronounced increase in particle sizes [32]. Nevertheless, these catalysts show much higher surface area than those spinels obtained from sol-gel methods [33,34]. Furthermore, the BET surface area of CCA-IM (112 m 2 /g) decreases compared to that of Al 2 O 3 (250 m 2 /g), which is due to the pore blockage by the metal oxides particles.…”

Section: Textural Propertiessupporting

confidence: 68%

Synthesis of 2-Methylpyrazine Over Highly Dispersed Copper Catalysts

Luo

Jing

et al. 2012

Catal Lett

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A series of CuCoAl catalysts were synthesized by co-precipitation and impregnation methods, tested in synthesis of 2-methylpyrazine (2-MP) and characterized by X-ray diffraction, N 2 adsorption, thermo-gravimetry analysis, H 2 -temperature-programmed reduction, dissociative N 2 O adsorption and temperature-programmed oxidation. The precursors prepared by co-precipitation method shows a well-crystallized hydrotalcite. The study proves that the calcination temperature of hydrotalcite has a significant effect on the catalyst surface area, crystallite size and copper dispersion. In comparison with catalyst prepared by impregnation, the catalyst prepared by co-precipitation method calcined at 500°C exhibits higher specific surface area, higher copper dispersion and the better reducibility. Consequently, CuCoAl catalyst derived from hydrotalcite is more active and selective for synthesis of 2-MP. Moreover, it shows the better stability due to the good resistance to coke formation.

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Section: Textural Propertiessupporting

confidence: 68%

Synthesis of 2-Methylpyrazine Over Highly Dispersed Copper Catalysts

Luo

Jing

et al. 2012

Catal Lett

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“…Various thermal treatment conditions were systematically investigated to originate their roles on treated catalysts [4,43]. Figure 9 demonstrates the effect of calcination temperature of the composite catalyst of CuFe 2 O 4 and Al 2 O 3 (ALO8) on DME conversion in DME SR (replotted from [4]).…”

Section: Thermal Treatmentmentioning

confidence: 99%

“…Research and development of the composite catalysts have attracted much attention as one of the key technologies in applying them to fuel cell system commercially. This article reviews and introduces recent progress of development of DME SR catalysts mainly done by our research group, including roles of solid-acid catalysts [24,30], copper spinel structures [29,31,41,43,44], preparation method [3,4,29,38], and reaction conditions [24, 29-31, 33, 38, 41, 43-45] as well as catalytic behaviors, deactivation, and regeneration of the catalysts [3,47].…”

Section: Introductionmentioning

confidence: 99%

Dimethyl Ether—Reforming Catalysts for Hydrogen Production

Faungnawakij

Eguchi

2010

Catal Surv Asia

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This article reviews our recent works on dimethyl ether steam reforming (DME SR) over nanocomposite catalysts of copper-based spinel oxide and solidacid catalyst. A series of Cu-based spinels was prepared by citric acid complexation method and their catalytic performance was studied in terms of activity, selectivity, and stability. The influence of preparation conditions, such as calcination temperature, reduction temperature, and chemical composition, and reforming conditions, such as steam-to-carbon ratio and reaction temperature, was systematically studied. Effect of type of solid-acid catalyst was also reported. Zeolite-based composites and aluminabased ones are highly active in temperature ranges of \300°C and [300°C, respectively. The composite of CuFe 2 O 4 and alumina treated thermally in air at 700-800°C exhibited excellent activity and stability in DME SR. Upon H 2 reduction, phase separation of copper spinel to metallic copper nanoparticles and host oxides proceeds. The high dispersion of the Cu particles (Cu 1? -rich surface of ca. 70%) on the hosts, and the strong chemical interaction between them could be observed. The H 2 -rich reformate ([70% H 2 ) could be attained for longer than 800 h at 375°C, showing the good potential for practical use in H 2 and fuel cell applications. Doping Ni to CuFe 2 O 4 significantly enhanced the stability of the catalyst, in accordance with the alloying effect. Regeneration of the degraded catalysts could be obtained by simple heattreatment since carbon deposits were removed, and spinel structures were reconstructed.

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“…One novel approach to disperse metal nanoparticles on oxide supports has been proposed as crystalline phase separation of parent complex oxides during reduction process (Faungnawakij et al 2009, Shimoda et al 2010. It has been demonstrated that Cu nanoparticles can be formed on the iron oxide (Fe 3 O 4 ) host from original copper-iron spinel oxide (CuFe 2 O 4 ).…”

Section: Metal and Metal Oxide Nanoparticlesmentioning

confidence: 99%

Trend of Nanoparticle Technology in ASEAN with Emphasis on Thailand

Tanthapanichakoon

Charinpanitkul

Udomsak

et al. 2013

KONA

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First we survey the scope and level of research activities in nanoparticle technology (NPT) in ASEAN by looking at relevant international journal publications (2006)(2007)(2008)(2009)(2010)(2011)(2012) in terms of absolute numbers (AN), numbers of publications per million population (PMP) and per billion USD GDP (PBG). Obviously, the statistics show that, within ASEAN, the strength of Singapore covers a wide range of nanotechnology fields and applications, including carbon materials, biosensors, bioelectronics, and pharmaceutics. Malaysia places emphasis on alloys & compounds, carbon materials, and separation technology. Thailand s emphasis is on molecular modeling, carbon materials, and biosensors. When classification is made on the morphology of nanoparticles mentioned in the titles, the topmost are nanotubes (including CNT, SWCNT, MWCNT) at 392 out of 612 (64.1%), followed by generic nanoparticle/ nanopowder and nanofiber (including nanowire, nanorods). Next we look closer at 2 nanoparticle R&D organizations in Thailand, namely, CEPT (CU) and NANOTEC together with their alliances. The interest in nanotechnology of SCG (Siam Cement Group), a leading Thai industrial conglomerate, will also be briefly introduced. .

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Catalytic performance enhancement by heat treatment of CuFe2O4 spinel and γ-alumina composite catalysts for steam reforming of dimethyl ether

Cited by 33 publications

References 29 publications

Synthesis of 2-Methylpyrazine Over Highly Dispersed Copper Catalysts

Synthesis of 2-Methylpyrazine Over Highly Dispersed Copper Catalysts

Dimethyl Ether—Reforming Catalysts for Hydrogen Production

Trend of Nanoparticle Technology in ASEAN with Emphasis on Thailand

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