Slurry phase methanation of carbon monoxide over nanosized Ni–Al2O3 catalysts prepared by microwave-assisted solution combustion

Gao, Yuan; Meng, Fanhui; Ji, Keming; Song, Yuncai; Li, Zhong

doi:10.1016/j.apcata.2015.11.006

Cited by 32 publications

(22 citation statements)

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“…The H 2 ‐TPR profiles of the three samples are displayed in Figure ; reduction peaks for Ni 2 O 3 , NiO, and the spinel are evident . According to previous studies, these peaks are assigned to the reduction of surface free NiO (α), weakly interacting surface NiO (β 1 ), strongly interacting surface NiO (β 2 ), and the spinel (γ), respectively . Among the three catalysts, the NiO reduction temperature of Ni/MgAl 2 O 4 is lower than that of Ni/NiAl 2 O 4 and Ni/CaAl 2 O 4 , which indicates that the MgAl 2 O 4 spinel support interacts more weakly with the active metal (Ni) than NiAl 2 O 4 and CaAl 2 O 4 , which leads to significant sintering of the free NiO in Ni/MgAl 2 O 4 .…”

Section: Resultsmentioning

confidence: 84%

“…[28] Accordingt op reviouss tudies, these peaks are assigned to the reduction of surface free NiO (a), weaklyi nteracting surface NiO (b 1 ), strongly interacting surface NiO (b 2 ), and the spinel (g), respectively. [29,30] Figure 4. In all cases,C H 4 and CO 2 were converted into H 2 andC Ow ith time-on-stream.…”

Section: Characterization Of Supports and Catalystsmentioning

confidence: 99%

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Enrichment of Hydrogen Production from Biomass‐Gasification‐Derived Syngas over Spinel‐Type Aluminate‐Supported Nickel Catalysts

2018

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Synthesis gas produced through biomass gasification can be converted into H2‐rich gas by catalytic methane decomposition or reforming reactions. In this study, we investigate the promotion of hydrogen production by the catalytic reforming of a model biomass‐gasification‐derived syngas over Ni/MAl2O4 (M=Mg, Ni, and Ca) catalysts. Three mesoporous spinel supports were synthesized by solution combustion. Ni/NiAl2O4 and Ni/CaAl2O4 exhibited better catalytic activities and stabilities for syngas reforming than the other catalysts. These results are ascribable to interactions between the metallic catalyst and spinel supports, and stronger interactions lead to smaller catalyst particles. The formation of coke deposits is associated with CH4 decomposition during the syngas reforming reaction. Clearly, H2 production is lower at 900 °C because of increased competition from the reverse water–gas shift reaction that shifts the reaction between CO2 and H2 toward the generation of CO and H2O.

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Section: Resultsmentioning

confidence: 84%

Section: Characterization Of Supports and Catalystsmentioning

confidence: 99%

Enrichment of Hydrogen Production from Biomass‐Gasification‐Derived Syngas over Spinel‐Type Aluminate‐Supported Nickel Catalysts

2018

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“…The turnover frequency (TOF) value of the samples was a key dependent variable for the catalytic performance, as shown in Figure 1c. From the results, the TOF of Ni/MgAl-LDO (FNP) was considerably greater than Ni/MgAl-LDO (CP) [23,24], and the highest TOF value was obtained at 350 • C of about 0.14 s −1 . From Figure 1d, the CH 4 yield of Ni/MgAl-LDO (FNP) reached a maximum value at 350 • C of about 79.6%.…”

Section: Introductionmentioning

confidence: 95%

High CO Methanation Performance of Two-Dimensional Ni/MgAl Layered Double Oxide with Enhanced Oxygen Vacancies via Flash Nanoprecipitation

Zhang

et al. 2018

Catalysts

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As a methanation tool, two-dimensional (2D) carrier-loaded Ni has attracted the attention of many researchers. We successfully prepared 2D MgAl layered double oxides (LDO) carriers via flash nanoprecipitation (FNP). Compared to the LDO samples prepared by conventional co-precipitation (CP), the 2D MgAl-LDO (FNP) has more oxygen vacancies and more exposed active sites. The Ni/MgAl-LDO (FNP) catalyst demonstrates a CO conversion of 97%, a CH 4 selectivity of 79.8%, a turnover frequency of 0.141 s −1 , and a CH 4 yield of 77.4% at 350 • C. The weight hourly space velocity was 20,000 mL·g −1 ·h −1 with a synthesis gas flow rate of 65 mL·min −1 , and a pressure of 1 atm. A control experiment used the CP method to prepare Ni/MgAl-LDO. This material exhibits a CO conversion of 81.1%, a CH 4 selectively of 75.1%, a TOF of 0.118 s −1 , and a CH 4 yield of 61% at 450 • C. We think that this FNP method can be used for the preparation of more 2D LDO catalysts. molecular sieve catalysts (Ni/3D-MCM-41), the Ni/2D-SiO 2 catalyst showed remarkable catalytic activity with high CO conversion and CH 4 selectivity at 450 • C.Natural mineral vermiculite (VMT) with a 2D structure as a catalyst support was reported [12]. Li et al. [13] attempted to expand multilayered vermiculite as a catalyst support and successfully synthesized NiO/VMT composite by microwave irradiation-assisted synthesis (MIAS). The Ni/VMT (MIAS) resulted in highly dispersed active sites and exhibited excellent catalysis performance, including a 99.6% CO conversion and 93.8% CH 4 selectivity at 400 • C. Zhang et al. [14] synthesized a 2D plasma-treated vermiculite (PVMT) with low Ni loading (0.5 wt %) via a plasma irradiation method (PIM). The PIM-Ni/PVMT exhibited superior catalytic performance, and the plasma-treated catalyst PIM-Ni/PVMT achieved a CO conversion of 93.5% and a turnover frequency (TOF) of 0.8537 s −1 at a temperature of 450 • C and a pressure of 1.5 MPa.Other 2D catalysts for CO methanation include 2D Ni-based layered double oxides (LDO) from layered double hydroxides (LDH). These systems are popular because of their high Ni dispersibility [15,16]. NiAl-LDO offers excellent activity for methanation under 2.0 MPa and 527 • C. NiAl-LDO catalysts with 56.5 wt % Ni achieved 97% CO conversion in a pilot methanation unit. Bian et al.[17] synthesized a NiAl-LDO catalyst that displayed high catalytic stability due to high Ni dispersion and strong resistance to coke deposition versus the impregnated catalyst. Nearly 100% CO conversion was achieved with reaction temperatures between 400 and 500 • C with a weight hourly space velocity (WHSV) of 300,000 mL·g −1 ·h −1 .Mg adulteration can also improve the anti-coke ability of Ni-based catalysts. Li et al.[18] synthesized Ni-Mg-Al LDO (i.e., NiMg8, Ni/Mg = 1/8) via a co-precipitation method. The as-obtained catalyst with 11 wt % Ni had the best CO methanation performance due to the small size of Ni particles and high Ni dispersion. The NiMg8 had excellent performance: 99.8% CO conversion and 73.6% CH 4 selectivi...

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“…Microstructure analysis indicated that the development of a stable combustion and a relative low combustion temperature resulted in the impressively high BET area (256.2 m 2 g −1 ) and metal surface area (34.6 m 2 g −1 ) and the smallest Ni particle size of Ni–Al catalysts. Due to the minimum Ni particle size, highly dispersive active Ni species on support and high stability of support, the urea‐derived catalysts exhibited improved anti‐sintering properties during 200 h lifetime test, enhanced conversion of CO (95.7%), and selectivity for CH 4 (96.2%) …”

Section: Hydrogenation–methanation Reactionsmentioning

confidence: 99%

Review of Recent Studies on Solution Combustion Synthesis of Nanostructured Catalysts

et al. 2018

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Solution combustion synthesis (SCS) is a relatively new method for synthesizing catalytic materials with many distinct advantages: simplicity of method, short reaction times, and the capability to regulate crystal lattice parameters and thereby the activity and selectivity of catalysts. Over the last years, SCS has been used for the production and study of a multitude of new catalytic materials. This review considers and discusses the recent developments and trends in SCS of nanocatalysts, while special attention is paid to the development and applications of nanostructured catalysts.

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Slurry phase methanation of carbon monoxide over nanosized Ni–Al2O3 catalysts prepared by microwave-assisted solution combustion

Cited by 32 publications

References 50 publications

Enrichment of Hydrogen Production from Biomass‐Gasification‐Derived Syngas over Spinel‐Type Aluminate‐Supported Nickel Catalysts

Enrichment of Hydrogen Production from Biomass‐Gasification‐Derived Syngas over Spinel‐Type Aluminate‐Supported Nickel Catalysts

High CO Methanation Performance of Two-Dimensional Ni/MgAl Layered Double Oxide with Enhanced Oxygen Vacancies via Flash Nanoprecipitation

Review of Recent Studies on Solution Combustion Synthesis of Nanostructured Catalysts

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