Synthesis and characterization of non-noble nanocatalysts for hydrogen production in microreactors

Shetty, Krithi; Zhao, Shuo; Cao, Wei; Siriwardane, Upali; Seetala, Naidu V.; Kuila, Debasish

doi:10.1016/j.jpowsour.2006.04.130

Cited by 12 publications

(6 citation statements)

References 23 publications

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“…In previous studies, we showed the advantage of silica over alumina as a FT catalyst support in terms of good adhesion with the Si microchannels. − Furthermore, it was observed that the addition of a noble metal such as ruthenium to the iron–cobalt catalyst in silica helped as a promoter to obtain higher conversion of syngas to alkanes with slightly lower selectivity to propane. , In order to have a better understanding of the role of each individual metal, i.e., Ru, Fe, and Co, we have now focused on FT synthesis using each metal, separately, in a Si-microchannel microreactor.…”

Section: Introductionmentioning

confidence: 99%

Comparative Studies of Silica-Encapsulated Iron, Cobalt, and Ruthenium Nanocatalysts for Fischer–Tropsch Synthesis in Silicon-Microchannel Microreactors

Mehta

Deshmane

Zhao

et al. 2014

Ind. Eng. Chem. Res.

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Fischer–Tropsch (FT) synthesis in Si-microchannel microreactors, containing 116 channels (50 μm × 100 μm × 1.3 cm), was carried out using SiO2-encapsulated Fe, Co, and Ru catalysts. The microchannels were uniformly coated with catalyst via a modified closed channel infiltration (mCCI) procedure. The mCCI method helps to load the catalyst without blockage of channels with no issues related to anodic bonding. The catalysts were characterized by scanning electron microscopy, optical microscopy, energy-dispersive X-ray spectroscopy, and Brunaer–Emmett–Teller analysis. The metal type, temperature, and H2/CO mole ratio showed a significant effect on FT synthesis. The highest FT reactivity of 0.1746 mol of CO g–1 h–1 was observed for Ru/SiO2, and the highest CO conversion of 90% was obtained with Co/SiO2 at 250 °C. The highest selectivity to propane (44%) and butane (8%) was observed for Co/SiO2 and Ru/SiO2, respectively, at 250 °C and 3:1 H2/CO. The deactivation rates of the catalysts in the microreactor for FT synthesis followed the order Ru/SiO2 > Fe/SiO2 > Co/SiO2.

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Section: Introductionmentioning

confidence: 99%

Comparative Studies of Silica-Encapsulated Iron, Cobalt, and Ruthenium Nanocatalysts for Fischer–Tropsch Synthesis in Silicon-Microchannel Microreactors

Mehta

Deshmane

Zhao

et al. 2014

Ind. Eng. Chem. Res.

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“…In this method, physicochemical properties of catalysts like porosity and surface area are controllable by pretreatment steps such as aging, drying, calcination and other synthesis conditions. Different supported metals such as Co, Cu, Ni, Pt and Rh have been used to catalytic reforming of hydrocarbons [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The influence of nickel loading on reducibility of NiO/Al<sub>2</sub>O<sub>3</sub> catalysts synthesized by sol-gel method

Zangouei

Moghaddam

Arasteh

2010

Chem. Eng. Res. Bull.

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Abstract:The sol-gel method was used to synthesize nickel-alumina catalysts with various nickel loadings. Chemical and physical properties of support and supported nickel were characterized by TGA, DTA, EDX, SEM, BET, XRD and TPR techniques. Calcination temperature (500 • C) was determined by performing thermogravimetric analysis (TGA) and differential thermal analysis (DTA) on the samples. Energy dispersive X-ray (EDX) was used to determine the actual content of nickel on alumina. N 2 adsorption test revealed that the specific surface area varied between 550 and 223 m 2 /g for pure alumina and 30%Ni/Al, respectively. X-ray diffraction (XRD) patterns showed no peaks due to NiO species and NiO species were well dispersed on the support by formation of NiAl 2 O 4 phase. Temperature-programmed reduction (TPR) indicated that the nickel species mainly presented in NiAl 2 O 4 phase and small amount of NiO. In the 20 percent nickel loading, the surface NiAl 2 O 4 phase, which is between NiO and bulk NiAl 2 O 4 phases in terms reducibility, was formed considering as a successful result.

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“…Moreover, the methanol conversion was benefitted over this catalyst and full conversion attained at 400 • C. Other monometallic Ni catalysts supported on other simple oxides have also been studied. For example, 12 wt.% Ni/SiO 2 converted 53% of methanol and showed H 2 selectivity as high as 74% at 200 • C only [39], while in another work 10 wt.% Ni/Al 2 O 3 exhibited a conversion of only 24% at 400 • C and a H 2 yield of only about 15% [40]. In this last work, a comparison between the Al 2 O 3 supported catalyst and Ni catalysts supported on MgO prepared through different methods showed that not only did the Al 2 O 3 supported catalyst show higher methanol conversion and H 2 yield (400 • C), but it also showed lower CO selectivity (600 • C).…”

Section: Catalytic Activity and H 2 Selectivitymentioning

confidence: 99%

Catalytic Steam Reforming of Biomass-Derived Oxygenates for H2 Production: A Review on Ni-Based Catalysts

et al. 2022

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The steam reforming of ethanol, methanol, and other oxygenates (e.g., bio-oil and olive mill wastewater) using Ni-based catalysts have been studied by the scientific community in the last few years. This process is already well studied over the last years, being the critical point, at this moment, the choice of a suitable catalyst. The utilization of these oxygenates for the production of “green” H2 is an interesting alternative to fuel fossils. For this application, Ni-based catalysts have been extensively studied since they are highly active and cheaper than noble metal-based materials. In this review, a comparison of several Ni-based catalysts reported in the literature for the different above-mentioned reactions is carried out. This study aims to understand if such catalysts demonstrate enough catalytic activity/stability for application in steam reforming of the oxygenated compounds and which preparation methods are most adequate to obtain these materials. In summary, it aims to provide insights into the performances reached and point out the best way to get better and improved catalysts for such applications (which depends on the feedstock used).

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Synthesis and characterization of non-noble nanocatalysts for hydrogen production in microreactors

Cited by 12 publications

References 23 publications

Comparative Studies of Silica-Encapsulated Iron, Cobalt, and Ruthenium Nanocatalysts for Fischer–Tropsch Synthesis in Silicon-Microchannel Microreactors

Comparative Studies of Silica-Encapsulated Iron, Cobalt, and Ruthenium Nanocatalysts for Fischer–Tropsch Synthesis in Silicon-Microchannel Microreactors

The influence of nickel loading on reducibility of NiO/Al<sub>2</sub>O<sub>3</sub> catalysts synthesized by sol-gel method

Catalytic Steam Reforming of Biomass-Derived Oxygenates for H2 Production: A Review on Ni-Based Catalysts

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