LaNiO3@SiO2 core–shell nano-particles for the dry reforming of CH4 in the dielectric barrier discharge plasma

Zheng, Xiaogang; Tan, Shiyu; Dong, Lichun; Li, Shaobo; Chen, Hongmei

doi:10.1016/j.ijhydene.2014.05.083

Cited by 71 publications

(36 citation statements)

References 35 publications

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“…Fig. 1 shows a schematic diagram of the setup for the experiment of dry reforming assisted by plasma and catalysts, which is similar to the previous work [32]. The mixed gases of CH 4 and CO 2 , controlled by mass flow controllers, were injected into the annular gap between the inner ceramic-tube (416 Â 2) and the outer glasstube (425 Â 2.5).…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, less attention has focused on the catalytic deactivation caused by coke formation during the dry reforming process. For plasma-assisted dry reforming, coke deposition arises from the decomposition of CH 4 because the dissociation energy of CH 4 (4.51 eV) is lower than that of CO (11.09 eV) [7,9,32].…”

Section: Introductionmentioning

confidence: 99%

“…Small particle size and uniform dispersion of metallic particles seem to be capable of reducing carbon deposition and improving the stability of the catalysts [32,33]. In this context, the method for the preparation of small particles of nickel (Ni, <20 nm) by the reduction of spinel oxide (NiM 2 O 4 ) has attracted special attention [35e37].…”

Section: Introductionmentioning

confidence: 99%

“…The monodispersed and ultrafine active metal particles in an embedded structure can effectively hinder coke formation and suppress the sintering of the active metal [32,39]. Therefore it is possible to encapsulate ultrafine spinel NPs such as NiFe 2 O 4 within porous silicon (SiO 2 ).…”

Section: Introductionmentioning

confidence: 99%

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

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Section: Introductionmentioning

confidence: 99%

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“…3 significantly change its dielectric behavior and turn dielectric nature of BTO to semiconducting one [21]. Moreover, the core/shell structures usually need a multi-step synthesis pathway to be fabricated.…”

mentioning

confidence: 99%

Obtaining a novel crystalline/amorphous core/shell structure in barium titanate nanocrystals by an innovative one-step approach

Ashiri

2015

RSC Adv.

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Synthesis temperature and purity of core/shell nanocrystals are key challenges facing the scientific community. Moreover, the core/shell structures usually need a multi-step synthesis pathway to be fabricated. This work aims to address these challenges by developing an innovative one-step synthesis pathway for obtaining carbonate-free BaTiO 3 core/shell nanocrystals at low temperature. The results show that very fine BaTiO 3 core/shell nanocrystals (<11 nm) free from any by-products such as BaTi 2 O 5 and BaCO 3 are synthesized at 323 K (50 °C). This newly developed structure can significantly reduce the sintering temperature of the nanocrystals and can be beneficial in fabricating the ceramic parts at lower sintering temperatures. 3 significantly change its dielectric behavior and turn dielectric nature of BTO to semiconducting one [21].Facile strategies for nanocrystals synthesis are of fundamental importance in the advancement of nanoscience and nanotechnology. In this work, it has been tried to develop and describe a new methodology for the synthesis of carbonate-free BTO nanocrystals. This methodology provides a one-step, convenient, low-cost, nontoxic, and mass-productive route for the synthesis of BTO nanocrystals. On the other hand, BTO is conventionally obtained by solidstate synthesis between barium carbonate (BaCO 3 ) and titania (TiO 2 ) at 1473 K (1200°C) [18][19]. Some wet chemical approaches need a calcination process at temperatures above 973 K (700°C) [11]. The products of these methods contain some inhomogenities and by-products [13,16]. As the great advance made by this work, our method of synthesis is able to obtain high-quality homogenous carbonate-free BTO nanocrystals at a low temperature of 323 K (50 °C).Core-shell nanostructures have recently received much attention for their enhanced properties and performances [24][25][26][27]. Moreover, the core-shell structures are normally chosen believing that these can cause a better coupling between the two phases. In this work, a new family of core-shell structure is developed which the core and shell have similar composition while core are crystalline and shell is amorphous. Moreover, for the first time, the novel core/shell nanostructures are obtained by a one-step synthesis method. On theother hand, obtaining nanocrystalline ceramic parts from their nanopowders is one of the most important challenges facing the scientific communities since the high temperature of the sintering process results in particle growth and as the consequence; the final structure becomes submicron-sized. When the shell is amorphous, this layer absorbs thermal energy to become crystalline and thus the required energy for particle growth cannot be provided. TheIn stage (i), the decarbonation treatments of deionized water are performed in three stages including boiling at 373 K (100 °C) for 30 min, bubbling with Ar gas for 30 min and increasing the pH of deionized water above pH 8.5. This three-stage process leads to removal of the carbon species and dissolved CO 2 gas fr...

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Sintering and Coke Resistant Core/Yolk Shell Catalyst for Hydrocarbon Reforming

Wang

Kawi

2018

ChemCatChem

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Syngas/hydrogen production via hydrocarbon reforming reactions is crucial. Whereas, they need high reaction temperature to obtain economically feasible hydrocarbon conversions, which renders the active and cheap transition metal based catalysts easy to be sintered, leading to the high carbon deposition rate and gradual degradation of catalytic performance. Therefore, developing sintering and carbon resistant catalysts becomes one of the most important issues for these reforming reactions to be industrially applied. Designing catalysts with core/yolk shell structure turns out to be one of the most effective strategies to solve this issue. Herein, recent progress which has been made in the synthesis method for core/yolk shell catalysts with different shell materials such as SiO2, zeolite, CeO2 and Al2O3 is summarized. Additionally, specific applications of these core/yolk catalysts for various hydrocarbon reforming reactions such as dry reforming, steam reforming and methane oxidation are reviewed with the emphasis on revealing the reasons leading to their outstanding catalytic performance. Lastly, possible research directions in core/yolk shell catalysts are proposed.

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LaNiO3@SiO2 core–shell nano-particles for the dry reforming of CH4 in the dielectric barrier discharge plasma

Cited by 71 publications

References 35 publications

Plasma-assisted catalytic dry reforming of methane: Highly catalytic performance of nickel ferrite nanoparticles embedded in silica

Plasma-assisted catalytic dry reforming of methane: Highly catalytic performance of nickel ferrite nanoparticles embedded in silica

Obtaining a novel crystalline/amorphous core/shell structure in barium titanate nanocrystals by an innovative one-step approach

Sintering and Coke Resistant Core/Yolk Shell Catalyst for Hydrocarbon Reforming

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