Effects of noble metals doped on mesoporous <scp>LaAlNi</scp> mixed oxide catalyst and identification of carbon deposit for reforming <scp>CH<sub>4</sub></scp> with <scp>CO<sub>2</sub></scp>

Arandiyan, Hamidreza; Peng, Yue; Liu, Caixia; Chang, Huazhen; Li, Junhua

doi:10.1002/jctb.4127

Cited by 56 publications

(35 citation statements)

References 42 publications

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“…However, these catalysts were observed to be severely deactivated due to carbon deposition [2]. Since then, the researchers dedicated to pursue the high efficient and coke-resistant catalysts for DRM and numerous materials like Ni, Co, Fe and noble metal (Pt, Rh, Pd, Ir) have been reported to be active for DRM [3][4][5]. Precious metals are proved to be less sensitive to coking as compared to Ni and the addition of second metals (alkali earth and rare earth metals) is of importance to reduce carbon deposition.…”

Section: Tel: +61 2 9385 1000mentioning

confidence: 99%

Catalytic Production of Syngas by Methane Reforming

Arandiyan¹,

Wang²

2017

Synth Catal

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Tel: +61 2 9385 1000Citation: Arandiyan H, Wang Y. Catalytic Production of Syngas by Methane Reforming. Synth Catal. 2017, 2:1.The research on methane reforming has recently gained considerable attention and proved the scientific interest as a way of producing hydrogen through the generation of synthesis gas (mixed gas of hydrogen and carbon monoxide). The conversion of syngas can be conducted by steam reforming and dry reforming, using H 2 O/CH 4 or CO 2 /CH 4 as feed gas respectively. Dry reforming of methane (DRM) process can achieve a higher CO/H 2 product ratio (3:1) than that of steam reforming (1:1). Additionally, DRM has also received attention from the environmental consideration since the emission of methane and carbon dioxide into the atmosphere causes undesirable effect on global warming through the greenhouse effect, and these harmful gases can be simultaneously converted into useful syngas [1].Ni and Co catalysts were the first studied for DRM by Fischer and Tropsch in 1928. However, these catalysts were observed to be severely deactivated due to carbon deposition [2]. Since then, the researchers dedicated to pursue the high efficient and coke-resistant catalysts for DRM and numerous materials like Ni, Co, Fe and noble metal (Pt, Rh, Pd, Ir) have been reported to be active for DRM [3][4][5]. Precious metals are proved to be less sensitive to coking as compared to Ni and the addition of second metals (alkali earth and rare earth metals) is of importance to reduce carbon deposition. Arandiyan et al. [6], synthesized the tri-metallic perovskite mixed oxides LaNi x Fe 1-x O 3 for the reforming of CH 4 to syngas and found the substitution of Fe in Ni perovskite catalyst affect the product rate and promote the stability. They also discovered that introducing O 2 with the feed gas flow can accelerate the decomposition of carbon and thus prevent the catalytic deactivation. The effect of modification with alkali metals (M=Li, Na, K) in M x La 1-x Ni 0.3 Al 0.7 O 3-d was investigated for DRM to produce syngas [1]. The Na incorporation in La site in the perovskite enhanced the activity efficiency while the K and Li substitution increased the reduction temperature and decreased the conversion rate of CH 4 at the same temperature comparing with LaNi 0.3 Al 0.7 O 3-d catalyst. However, the substituted catalysts with alkaline metals showed significant stability after 15 h on stream reaction, maintain their activity and selectivity in the production of syngas. In addition, the addition of Sr and Ca of La also showed specific influence on the activity and stability for DRM [7].In his recent study, Arandiyan and co-workers using a facile and simple propylene oxide assisted gelation agent route to successfully synthesize mesoporous nanocrystalline MgAl 2 O 4 [8,9]. The obtained spinel catalysts has large surface area in the range of 253-302 m 2 /g and narrow single modal pore size distributions in the mesopore region which promote the catalytic performance for CH 4 reforming and resist against the carbon formation. A...

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confidence: 99%

Catalytic Production of Syngas by Methane Reforming

Arandiyan¹,

Wang²

2017

Synth Catal

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“…The conventional preparation of ABO 3 involving a hightemperature solid-state reaction of its metal precursors usually results in a low specific surface area [1][2][3]. Therefore, a novel strategy is highly demanded to fabricate porous ABO 3 materials with high surface areas.…”

Section: Editorialmentioning

confidence: 99%

“…Consequently, heterogeneous catalysis can be improved through the incorporation of improved specific surface area via engineered porosity in a solid catalyst. Hence, new strategies and technologies are continuously being developed for the synthesis and structure-tailoring of high surface area of mesoporous materials.The conventional preparation of ABO 3 involving a hightemperature solid-state reaction of its metal precursors usually results in a low specific surface area [1][2][3]. Therefore, a novel strategy is highly demanded to fabricate porous ABO 3 materials with high surface areas.…”

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confidence: 99%

Porous Perovskite Materials in Catalysis

Arandiyan¹,

Wang²

2017

Synth Catal

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EditorialPerovskite-type oxides with the general formula ABO 3 containing both rare earth elements and 3d transition metals have received intensive attention in recent years due to their wide range of applications in adsorption, separation, catalysis, and sensors. In terms of the heterogeneous catalysis, the reaction always involves diffusion and adsorption of reactants on the surface of catalyst, surface reaction of adsorbed species and desorption of products. Clearly, the reactions happened on the surface of catalyst; therefore making surface area as a critical factor to determine the availability of catalytic sites. Consequently, heterogeneous catalysis can be improved through the incorporation of improved specific surface area via engineered porosity in a solid catalyst. Hence, new strategies and technologies are continuously being developed for the synthesis and structure-tailoring of high surface area of mesoporous materials.The conventional preparation of ABO 3 involving a hightemperature solid-state reaction of its metal precursors usually results in a low specific surface area [1][2][3]. Therefore, a novel strategy is highly demanded to fabricate porous ABO 3 materials with high surface areas. Recently, this problem has been solved using the close-packed Colloidal Crystal Template (CCT) method for the preparation of three-dimensionally ordered macroporous (3DOM) perovskite. The CCT which are usually formed by ordering monodispersed microspheres poly(methyl methacrylate) (PMMA), polystyrene or silica are always used to replicate the face-centered close-packed array. With PMMA microspheres as template, Arandiyan et al. [9] investigated Au-Pd alloy nanoparticles (1-3 wt%) dispersed on nanohybrid 3DOM La 0.6 Sr 0.4 MnO 3 (LSMO) perovskite catalysts as novel distinctive class of materials and found to exhibit much higher activity than previously reported monometallic counterparts towards methane combustion. They discovered new functionalised hybrid catalysts within the temperature required for emission control. The study not only advanced knowledge in material chemistry, but also leaded to breakthroughs in the area of engineering hybrid to reduce emission and generate environmental benefits.Bimetallic AuPd/3DOM LSMO catalysts with high surface areas for methane oxidation were successfully fabricated (Figure 1). The unique AuPd/3DOM LSMO catalysts exhibit excellent thermal stability and resistance to deactivation by water vapor during methane combustion. These bimetallic catalysts, possessing a unique 3DOM structure and Au-Pd alloy arrangement, giving excellent catalytic activity which was found to be a combined effect of both the support and Au-Pd NPs including: (i) The high surface area, (ii) Richness in adsorbed oxygen, (iii) Oxidized noble metal species on the surface, (iv) Modified electronic structure of the Au-Pd alloy, (v) Low-temperature reducibility, and (vi) Strong interaction between the Au-Pd alloy and the 3DOM support. The distinctive 3DOM structure, stable NP size and electron interaction withi...

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“…The conversions of CH 4 and CO 2 are shown in Figures 4a and 4b, respectively. The obtained results show that when increasing Ni content up to 0.075 g/g (7.5 mass %), both CH 4 and CO 2 conversions are increased in all operating temperatures.…”

Section: Catalytic Performancementioning

confidence: 99%

“…However, the major problem in commercializing nickel-based catalysts for this reaction is the rapid deactivation of these catalysts due to carbon deposition. The carbon in DRM process can be formed by the following reactions: [4][5][6] CH 4 $ C þ 2H 2 DH 0 298 ¼ 75 kJ=mol ðMethane decompositionÞ ð1Þ…”

Section: Introductionmentioning

confidence: 99%

Preparation of nanocrystalline Ni/Al₂O₃ catalysts with the microemulsion method for dry reforming of methane

2016

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Mesoporous nanocrystalline nickel-alumina catalysts with high surface area were prepared by a microemulsion (ME) method and were employed in methane reforming with carbon dioxide for syngas production. The catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller surface area analysis (BET), temperature-programmed reduction (TPR), temperature-programmed oxidation (TPO), and scanning electron microscopy (SEM) techniques. The results showed that the catalysts possessed mesoporous structure with high surface area (> 250 m 2 Á g À1 ) and small crystallite size ($5 nm). The catalytic results revealed high activity and stability for the prepared catalysts. In addition, the effect of feed ratio and GHSV on catalytic performance was investigated.

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Effects of noble metals doped on mesoporous LaAlNi mixed oxide catalyst and identification of carbon deposit for reforming CH₄ with CO₂

Cited by 56 publications

References 42 publications

Catalytic Production of Syngas by Methane Reforming

Catalytic Production of Syngas by Methane Reforming

Porous Perovskite Materials in Catalysis

Preparation of nanocrystalline Ni/Al₂O₃ catalysts with the microemulsion method for dry reforming of methane

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Effects of noble metals doped on mesoporous LaAlNi mixed oxide catalyst and identification of carbon deposit for reforming CH4 with CO2

Cited by 56 publications

References 42 publications

Catalytic Production of Syngas by Methane Reforming

Catalytic Production of Syngas by Methane Reforming

Porous Perovskite Materials in Catalysis

Preparation of nanocrystalline Ni/Al2O3 catalysts with the microemulsion method for dry reforming of methane

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Effects of noble metals doped on mesoporous LaAlNi mixed oxide catalyst and identification of carbon deposit for reforming CH₄ with CO₂

Preparation of nanocrystalline Ni/Al₂O₃ catalysts with the microemulsion method for dry reforming of methane