The surfactant-assisted Ni–Al2O3 catalyst prepared by a homogeneous precipitation method for CH4 steam reforming

Jung, You-Shick; Yoon, Wang-Lai; Rhee, Young‐Woo; Seo, Yong-Seg

doi:10.1016/j.ijhydene.2012.03.017

Cited by 19 publications

(14 citation statements)

References 28 publications

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“…From a comparison of the RAWS and RAWOS sorption isotherm results, the addition of the polymer stabilizer apparently leads to an increase in the pore volume and pore radius and a decrease in the surface area values by 10.2 m 2 •g −1 . A similar trend has been reported previously for Ni-Al2O3 catalyst stabilized by cetyltrimethylammonium bromide [30].…”

Section: Characterizationsupporting

confidence: 91%

“…The reason for the enhancement of the catalytic activity in the PEG-stabilized materials results from a combination of factors. First, the increase in the pore volume and pore size would appear to be the dominant effect (Table 1) [30]. Second, the stoichiometric and non-stoichiometric ruthenium oxides (and hence variable ruthenium oxidation states) states might be expected to contribute to the catalyst activity as is seen, for example, for MnOx (where x ≤ 2) [48].…”

Section: Discussionmentioning

confidence: 99%

“…Even though many surfactant materials are commercially available, PEG is an attractive choice as an additive since its oxidation products contain no nitrogen, sulfur or phosphorous thus precluding catalyst poisoning during heat treatment [27]. There are several reports describing the use of polymer stabilizers for the preparation of the catalysts [28][29][30], but very few detailed studies on the surfactant-induced morphological changes and subsequent correlations with activity are reported. A fuller understanding of such relationships provides a useful means to improve catalyst performance.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Characterization and Shape-Dependent Catalytic CO Oxidation Performance of Ruthenium Oxide Nanomaterials: Influence of Polymer Surfactant

2015

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Ruthenium oxide nano-catalysts supported on mesoporous γ-Al2O3 have been prepared by co-precipitation method and tested for CO oxidation. The effect of polyethylene glycol (PEG) on the properties of the catalyst was studied. Addition of the PEG surfactant acted as a stabilizer and induced a change in the morphology of ruthenium oxide from spherical nanoparticles to one-dimensional nanorods. Total CO conversion was measured as a function of morphology at 175 °C and 200 °C with 1.0 wt.% loading for PEG-stabilized and un-stabilized catalysts, respectively. Conversion routinely increased with temperature but in each case, the PEG-stabilized catalyst exhibited a notably higher catalytic activity as compared to the un-stabilized equivalent. It can be assumed that the increase in the activity is due to the changes in porosity, shape and dispersion of the catalyst engendered by the use of PEG.

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Section: Characterizationsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, Characterization and Shape-Dependent Catalytic CO Oxidation Performance of Ruthenium Oxide Nanomaterials: Influence of Polymer Surfactant

2015

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“…또한 메탄 [11], 바이오 에탄올 [12], 초산 [13], 에탄올 [14][15][16][17], 글리세롤 [18], 바이오 오일 [19]의 수증기 개질반응에서도 C-C 결합을 효과적으로 끊어 내어 [20] Table 1에 제시하였다.…”

Section: 서 론unclassified

Steam Reforming of Ethylene Glycol over Ni/Al₂O₃Catalysts: Effect of the Preparation Method and Reduction Temperature

Choi¹,

Park²,

Park

2015

Korean Chemical Engineering Research

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− The effect of preparation method on the catalytic activities of the Ni/Al 2 O 3 catalysts on steam reforming of ethylene glycol was investigated. The catalysts were prepared with various preparation methods such as an incipient wetness impregnation, wet impregnation, and coprecipitation method. In the case of coprecipitation method, various precipitants such as KOH, K 2 CO 3 , and NH 4 OH were compared. The prepared catalysts were characterized by using N 2 physisorption, inductively coupled plasma-atomic emission spectroscopy, X-ray diffraction, temperatureprogrammed reduction, pulsed H 2 chemisorption, temperature-programmed oxidation, scanning electron microscopy, and thermogravimetric analysis. Among the catalysts reduced at 773 K, the Ni/Al 2 O 3 catalyst prepared by a coprecipitation with KOH or K 2 CO 3 as precipitants showed the best catalytic performance. The preparation method affected the particle size of Ni, reducibility of nickel oxides, catalytic performance (activity and stability), and types of coke formed during the reaction. The Ni/Al 2 O 3 catalyst prepared by a coprecipitation with KOH showed the increasing catalytic activity with an increase in the reduction temperature from 773 to 1173 K because of an increase in the reduction degree of Ni oxide species even though the particle size of Ni increased with increasing reduction temperature.

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“…In addition, nickel catalyst supported on boron-containing alumina is known to be highly stable and active in the steam reforming reaction by preventing carbon deposition [17]. It has also been reported that nickelealumina catalyst prepared by a homogeneous precipitation method using surfactant was stable for longterm steam reforming reaction [18].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen production by steam reforming of liquefied natural gas (LNG) over ordered mesoporous nickel–alumina catalyst

Bang

Han

Seo

et al. 2012

International Journal of Hydrogen Energy

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The surfactant-assisted Ni–Al2O3 catalyst prepared by a homogeneous precipitation method for CH4 steam reforming

Cited by 19 publications

References 28 publications

Synthesis, Characterization and Shape-Dependent Catalytic CO Oxidation Performance of Ruthenium Oxide Nanomaterials: Influence of Polymer Surfactant

Synthesis, Characterization and Shape-Dependent Catalytic CO Oxidation Performance of Ruthenium Oxide Nanomaterials: Influence of Polymer Surfactant

Steam Reforming of Ethylene Glycol over Ni/Al₂O₃Catalysts: Effect of the Preparation Method and Reduction Temperature

Hydrogen production by steam reforming of liquefied natural gas (LNG) over ordered mesoporous nickel–alumina catalyst

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The surfactant-assisted Ni–Al2O3 catalyst prepared by a homogeneous precipitation method for CH4 steam reforming

Cited by 19 publications

References 28 publications

Synthesis, Characterization and Shape-Dependent Catalytic CO Oxidation Performance of Ruthenium Oxide Nanomaterials: Influence of Polymer Surfactant

Synthesis, Characterization and Shape-Dependent Catalytic CO Oxidation Performance of Ruthenium Oxide Nanomaterials: Influence of Polymer Surfactant

Steam Reforming of Ethylene Glycol over Ni/Al2O3Catalysts: Effect of the Preparation Method and Reduction Temperature

Hydrogen production by steam reforming of liquefied natural gas (LNG) over ordered mesoporous nickel–alumina catalyst

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Product

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Steam Reforming of Ethylene Glycol over Ni/Al₂O₃Catalysts: Effect of the Preparation Method and Reduction Temperature