Synthesis of Ni/γ-Al2O3SiO2 catalysts with different silicon precursors for the steam toluene reforming

Claude, Vincent; Mahy, Julien G.; Geens, Jérémy; Courson, Claire; Lambert, Stéphanie D.

doi:10.1016/j.micromeso.2019.04.027

Cited by 23 publications

(7 citation statements)

References 24 publications

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“…Nickel supported on oxides can be highlighted among these transition metals [30][31][32][33][34][35][36][37][38][39][40][41][42][43]. Specifically, a variety of works have focused on the study of Ni catalysts supported in alumina such as Ni/gamma-Al2O3-SiO2 with different silicon precursors [44], nickel catalysts supported on hexaaluminates [45], Ni-doped γ-Al2O3 [46], Ni/Ce-Al2O3 [47], etc. As mentioned, the alumina is one of the most used supports, but it is not the only one.…”

Section: Introductionmentioning

confidence: 99%

Toluene steam reforming over nickel based catalysts

Sayas

Vivó

Costa-Serra

et al. 2021

International Journal of Hydrogen Energy

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Steam reforming of toluene (SRT) has been studied initially in eight nickel-based catalysts where nickel (10 wt.%) was incorporated in different supports (olivine, Al2O3, MgO, LDH, ZrO2, CeO2 and natural sepiolite) by the incipient wetness impregnation method. Among them, nickel catalyst based on sepiolite exhibited a promising catalytic performance, with a high conversion of toluene (16%), high selectivity to hydrogen (68.4%) and low production of undesired by-products (CO, CH4, ethylene and benzene) at low temperature (500 ºC). On the other hand, the incorporation of Ni in the sepiolitic material by precipitation (PP) has been considered as alternative method to the incipient wetness impregnation method (IWI). PP method allowed to prepare a Ni-based catalyst with a very high activity (conversion of toluene ~100%), high selectivity to hydrogen (73%) and lower production of undesirable by-products (5% CO, 2% CH4 and 0% C6H6) at 575 ºC. In addition, catalytic deactivation due to coke deposition and nickel sinterization was clearly lower for the catalyst synthesized by PP. Characterization by different physicochemical techniques (XRD, TEM, BET surface area, ICP-OES, TPR and EA) showed that PP method allowed to obtain a sepiolite-based catalyst containing Ni with larger external surface area and smaller, highly dispersed and easily reducible Ni metal particles. The results here discussed show that the Ni incorporation method has a clear influence in the preparation of nickel catalyst supported on sepiolite with improved catalytic performance in the steam reforming of toluene.

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Section: Introductionmentioning

confidence: 99%

Toluene steam reforming over nickel based catalysts

Sayas

Vivó

Costa-Serra

et al. 2021

International Journal of Hydrogen Energy

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“…31 Tian et al 32 studied the catalytic activity of coal bottom ash for fuel gas production and tar elimination. They found that the existence of coal bottom ash could remarkably decrease the tar content to 0.97 g/Nm 3 . Above studies indicated that some solid wastes could be used as catalyst supports or catalysts and exhibited good catalytic performance under certain conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Promoters on Steam Reforming of Toluene over a Ni-Based Catalyst Supported on Coal Gangue Ash

et al. 2020

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The exploration of high-value-added materials using inorganic solid waste is a very important contribution to sustainable development. Coal gangue ash (CGA) as a solid waste was chosen as catalyst support. Five low-cost catalysts modified by different promoters (Co, Ce, Fe, Mn, and Mo) were prepared using a co-impregnation method. The toluene steam reforming tests were carried out at 800 °C under S/C = 2 (steam-to-carbon mole ratio). Catalyst characteristics were evaluated using X-ray diffraction (XRD), the Brunauer–Emmett–Teller (BET) method, temperature-programmed reduction (TPR), and Raman spectroscopy. The results showed that most promoters could interact with a Ni active compound and enhance the toluene conversion and H 2 yield. The Mo-Ni/CGA-1d (1d means the acid pretreatment time) catalyst performed the best catalytic activity, and corresponding toluene conversion and H 2 yield was equal to 92.6 and 62.3%, respectively, and it should be due to the formation of Mo-Ni alloy. Meanwhile, the Mo-Ni/CGA-1d catalyst exhibited higher stability during the runtime of 300 min compared with the Mn-Ni/CGA-1d catalyst, which can be attributed to the formation of the Mo 2 C structure with high-carbon-resistance ability. This is perhaps because the dissociation of CO 2 or H 2 O on the Mo 2 C structure surface is beneficial to the production of free oxygen species, which can accelerate the removal of carbon deposition on the catalyst surface.

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“…So there have been many literature papers reported on the effectiveness of many kinds of metal catalysts on tar removal. In particular, Ni‐based catalysts have been widely investigated for the steam reforming of biomass tar due to its high activity 13–18 . For all kinds of catalysts, Al 2 O 3 and SiO 2 are widely used as the catalyst supports because of their large surface area 15,16,19–21 …”

Section: Introductionmentioning

confidence: 99%

“…In particular, Ni-based catalysts have been widely investigated for the steam reforming of biomass tar due to its high activity. [13][14][15][16][17][18] For all kinds of catalysts, Al 2 O 3 and SiO 2 are widely used as the catalyst supports because of their large surface area. 15,16,[19][20][21] Coal fly ash (CFA)-a solid waste produced in thermal power plants as a result of coal combustion-is one of cost-effective materials that also can be used as a catalyst support.…”

mentioning

confidence: 99%

“…[13][14][15][16][17][18] For all kinds of catalysts, Al 2 O 3 and SiO 2 are widely used as the catalyst supports because of their large surface area. 15,16,[19][20][21] Coal fly ash (CFA)-a solid waste produced in thermal power plants as a result of coal combustion-is one of cost-effective materials that also can be used as a catalyst support. Because it is recognized as a silicate-alumina mineral rich in aluminum and silica with Ca, Fe, K, and Mg as prevailing elements and with Ti, Zr, Mn, Ce, Zn, and Ni as trace elements, 22 it has higher stability in various reactions, and heterogeneous catalysts synthesized using recycled CFA are cost effective and eco-friendly.…”

mentioning

confidence: 99%

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Catalytic steam reforming of toluene as model tar compound using Ni/coal fly ash catalyst

Lü

Xiong

et al. 2020

Asia-Pacific J Chem Eng

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Coal fly ash (CFA), a solid waste from power plants, was selected as the support of Ni-based catalysts used for steam reforming of toluene in a fixedbed reactor. The CFA support was thermally pretreatment first, followed by chemical activation with different treatment time (6 h to 4 days) in 2-mol/L HNO 3 solution. Then, series low-cost catalysts were prepared by wet impregnation. The prepared catalysts were characterized suitably by X-ray diffraction (XRD), Brunauere-Emmette-Teller (BET), temperature programmed reduction (TPR), temperature programmed desorption (TPD), and Raman techniques. According to the catalyst characterization, the chemical pretreatment could improve the support property by adjusting the chemical composition. The Fe-rich Fe-Ni and Ni-Co alloy was formed by H 2 reduction on the Ni/CFA-6h and Co-Ni/CFA-6h catalysts, respectively. In the catalytic steam reforming of toluene, the Ni/CFA-6h had the best catalytic active among all monometallic catalysts, which could be attributed to the existence of Fe 0.94 Ni 0.06 particles, and its performance could be further improved after partly replacing Ni by Co. The Co-Ni/CFA-6h catalyst exhibited the best ability of carbon deposit resistance, implying that its catalytic performance slightly lower than Ni/SiO 2 was due to the too large S BET surface area gap. K E Y W O R D S carbon deposit, catalyst, coal fly ash, steam reforming, toluene 1 | INTRODUCTION Recently, the depletion of fossil fuel is increasingly becoming a global concern. So along with the shortage of fossil fuels, biomass has drawn considerable attention owing to its high availability, low emission, and renewability. 1,2 Of all biomass thermochemical conversion technologies, gasification, in particular, enables the transformation of biomass into syngas, which include hydrogen and carbon monoxide. 3 Syngas can be converted into many kinds of chemical substances through the Fischer-Tropsch method and can be used for power generation. 4-6 However, the formation of tar in the syngas is the primary challenge and urgently facing the gasification process. 7 Biomass tars mainly are largely aromatic hydrocarbons, such as benzene, toluene, and naphthalene, and they constitute condensable fractions of the organic gasification product. 8 The presence of tar in syngas contributes to end-use problems such as blockages and corrosion in downstream filters, fuel line, engine nozzles, and turbines. 9 Therefore, the removal of biomass tar is an urgent problem to be solved at present.

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Synthesis of Ni/γ-Al2O3SiO2 catalysts with different silicon precursors for the steam toluene reforming

Cited by 23 publications

References 24 publications

Toluene steam reforming over nickel based catalysts

Toluene steam reforming over nickel based catalysts

Effect of Promoters on Steam Reforming of Toluene over a Ni-Based Catalyst Supported on Coal Gangue Ash

Catalytic steam reforming of toluene as model tar compound using Ni/coal fly ash catalyst

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