Effect of CeO&lt;SUB align="right"&gt;2 morphology on performance of NiO/CeO&lt;SUB align="right"&gt;2 catalyst in combined steam and CO&lt;SUB align="right"&gt;2 reforming of CH&lt;SUB align="right"&gt;4

Lộc, Lưu Cẩm; Phuong, Phan Hong; Putthea, Dang; Tri, Nguyen; Vân, Nguyễn Thị Thuỳ; Cuong, Hoang Tien

doi:10.1504/ijnt.2018.099935

Cited by 15 publications

(22 citation statements)

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“…In particular, the Ni/SBA-15-25NH 3 sample has a very low CO 2 conversion although it also has high basicity. The highest CH 4 conversion and the lowest CO 2 conversion obtained on this sample might be related to its highest reducibility, promoting the CH 4 reforming by steam according to Equation (6), with the result of CO 2 additional generation: [46,50], while this value reached 77% on the Ni/SBA-15 catalyst [9]. Furthermore, the promotion of the Ni/Al 2 O 3 catalyst by alkali metal additives [13,[47][48][49] or CeO 2 [48,49] or Zr [48] did not significantly improve the activity, and the CO 2 conversion did not exceed 78% at 700°C [47].…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, for the Ni/CeO 2 catalyst, vanadium additive shows its promoting role, since the conversion of CH 4 and CO 2 at 700°C was raised from 89% to 96% and from 67% to 75%, respectively [51], as 0.3%V was added to the Ni/CeO 2 catalyst. The special feature of the Ni/SBA-15 [9] compared with Ni/Al 2 O 3 [46] and Ni/CeO 2 [50] catalysts is that it has high conversion of both CH 4 and CO 2 . These values reach 86% and 77% at 700°C, respectively [9].…”

Section: Resultsmentioning

confidence: 99%

“…These facts proved that the alkalization of the Ni/SBA-15 catalyst by NH 3(aq) solution had an advantage over using MgO because side reactions were unlikely to occur. As shown in Table 2, there are three main groups of Nibased catalysts for the BRM reaction based on three supports including Al 2 O 3[14,[49][50][51][52] 56], CeO 2[45,50,51], and SBA-15[9,42,52]. In general, the highest value of CH 4 conversion reached on all three groups is…”

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Effect of NH3 Alkalization and MgO Promotion on the Performance of Ni/SBA-15 Catalyst in Combined Steam and Carbon Dioxide Reforming of Methane

Phuong

Lộc

Tri

et al. 2021

Journal of Nanomaterials

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In this work, 31.4 wt.% Ni/SBA-15 (Ni/SBA-15) nonpromoted and alkalized with ammonia solution and by MgO promoter catalysts were prepared and used for combined steam and CO2 reforming of CH4 (bireforming). Effect of concentration of ammonia solution (NH3(aq)) (10–25 vol.%) and Mg content (3–12 wt.%) on the properties of the Ni/SBA-15 catalysts was investigated by low-angle and powder X-ray diffraction (XRD), N2-BET isothermal adsorption, SEM, TEM, EDS mapping, H2-TPR, and CO2-TPD methods. The performance of the catalysts in bireforming was assessed in the temperature range of 550–800°C. The enhancement of dispersion of NiO particles, reducibility, and basicity of alkalized Ni/SBA-15 catalysts were responsible for improving the catalytic performance of this catalyst. The results revealed that the Ni/SBA-15 treated with 15-25% NH3(aq) solution and promoted with 3-9% Mg exhibited high activity for CH4 conversion. Meanwhile, Ni6Mg/SBA-15 showed the highest CO2 conversion. Among tested catalysts, Ni/SBA-15-20NH3 and Ni9Mg/SBA-15 samples had an almost equal activity with a CH4 conversion of nearly 97% and a CO2 conversion of about 84% at 700°C thanks to its moderate affinity with both CO2 and CH4. However, the H2/CO ratio of the product mixture remained at 2.02 on the Ni/SBA-15-20NH3 catalyst and almost 1 on the Ni9Mg/SBA-15 sample. These results might be related to the fact that the alkalization of the Ni/SBA-15 catalyst by NH3(aq) solution had an advantage over using MgO because side reactions were unlikely to occur.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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confidence: 97%

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Effect of NH3 Alkalization and MgO Promotion on the Performance of Ni/SBA-15 Catalyst in Combined Steam and Carbon Dioxide Reforming of Methane

Phuong

Lộc

Tri

et al. 2021

Journal of Nanomaterials

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“…Nanorod CeO 2 was synthesized using the hydrothermal method reported previously. 22) Firstly, 2.17 grams of Ce(NO 3 ) 3 .6H 2 O and 15.40 grams of NaOH were dissolved separately in 20 mL and 55 mL of distilled water, respectively. Then, NaOH solution was dropped continuously into Ce(NO 3 ) 3 solution and the mixture was kept stirring at 600 rpm within 1 hour before being transferred into a Teflon bottle (100 mL).…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Cobalt-Doped Ceria Nanorods for <i>p</i>-Xylene Deep Oxidation: Effects of Cobalt Precursor and Loading

et al. 2020

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In this work, a series of cobalt-doped ceria nanorods have been synthesized coming from two cobalt precursors by the impregnation method, based on ceria nanorods pre-formed by the hydrothermal method. The properties of obtained catalysts were investigated by various techniques, including Brunauer-Emmett-Teller nitrogen physisorption measurements (BET), X-ray powder diffraction (XRD), hydrogen temperature-programmed reduction (H 2 -TPR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The catalytic activities of as-prepared samples were studied in the deep oxidation of p-xylene at low temperatures (225300°C). The catalyst characterizations evidenced the crystalline phase formations of CeO 2 and Co 3 O 4 with the average crystallite sizes of 17.545.8 nm and 11.123.4 nm, respectively. The cobalt addition by cobalt nitrate into CeO 2 decreased the surface area of CeO 2 nanorods (67.9 m 2 .g ¹1 ), in contrast to the increase using cobalt acetate (76.082.5 m 2 .g ¹1 ). Co 3 O 4 /CeO 2 catalysts showed reduction peaks at much lower temperatures than that of pure nanorod ceria. 7.5 mass% Co 3 O 4 supported on nanorod CeO 2 catalyst synthesized from cobalt acetate as a type of cobalt precursor with the smallest nanoparticle size and high BET surface area was the most efficient for p-xylene deep oxidation, achieving more than 95% of p-xylene conversion to CO 2 at 275°C, and its performance was stabilized for more than 100 hours tested.

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“…18 The high activity and stability of Mg-modified Ni/Al 2 O 3 catalysts are due to the beneficial effects of MgO such as enhancement of steam adsorption, basic property, nanosized NiO crystallite, and strong interaction between Ni and the support. 19 In our previous studies, NiO catalysts supported on various supports such as α-Al 2 O 3 promoted by MgO, 20 CeO 2 of different morphologies, 21 mesoporous nanosilica SBA-15, 22 and MgO-promoted SBA-15 23 have been prepared and investigated for dry and bireforming of methane. The results show that the superior activity of NiO supported on CeO 2nanorods (CeO 2 -NR) has been attributed to the stronger interaction of NiO with CeO 2 -NR.…”

Section: Introductionmentioning

confidence: 99%

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO₂ Reforming of CH₄

Phuong

Tri

et al. 2022

ACS Omega

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Ni-based catalysts dispersed on different supports (MgO-α-Al 2 O 3 , CeO 2 , SBA-15, and MgO-SBA-15) were prepared by the impregnation method. Characteristics of the catalysts, including specific surface areas (N 2 physisorption), crystalline phase compositions (powder X-ray diffraction, Raman spectroscopy), reducibility (hydrogen temperature-programmed reduction, H 2 -TPR), and morphology (scanning electron microscopy (SEM) and transmission electron microscopy, TEM)) were investigated. The activity and stability of the catalysts were tested for the combined steam and CO 2 reforming of methane at 700 °C in a microflow system. The results show that the catalysts exhibit high activity in the BRM reaction. At 700 °C, the conversion of CH 4 and CO 2 reached 86–99% and 67–80%, respectively, in which the Ni/Mg–SBA catalyst is the best with conversions of CH 4 and CO 2 reaching 99% and 80%. Coke accumulation on the surface of the catalysts for 100 h time on stream (TOS) was evaluated by the temperature-programmed oxidation (TPO) technique. The major cause of the catalytic deactivation was elucidated by combining the determination of the amount and type of deposited coke with the changes in the physicochemical properties of the catalysts after the long-term reaction. Almost complete loss of activity was observed on Ni/Mg–Al catalyst after 100 h TOS, while the activity drop was slow on the Ni/Mg–SBA sample, about 15–20% of the total value. Otherwise, the Ni/CeO 2 and Ni/SBA catalysts firmly retained their stable activity for 100 h TOS due to the minimal carbon deposition and stability of these catalysts’ structure. The highly considerable formation of inert C γ carbon and sintering over Ni catalyst supported on MgO-α-Al 2 O 3 were responsible for the lower stability of this catalyst compared to those supported on CeO 2 and SBA-15.

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Effect of CeO<SUB align="right">2 morphology on performance of NiO/CeO<SUB align="right">2 catalyst in combined steam and CO<SUB align="right">2 reforming of CH<SUB align="right">4

Cited by 15 publications

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Effect of NH3 Alkalization and MgO Promotion on the Performance of Ni/SBA-15 Catalyst in Combined Steam and Carbon Dioxide Reforming of Methane

Effect of NH3 Alkalization and MgO Promotion on the Performance of Ni/SBA-15 Catalyst in Combined Steam and Carbon Dioxide Reforming of Methane

Fabrication of Cobalt-Doped Ceria Nanorods for <i>p</i>-Xylene Deep Oxidation: Effects of Cobalt Precursor and Loading

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO₂ Reforming of CH₄

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Effect of CeO<SUB align="right">2 morphology on performance of NiO/CeO<SUB align="right">2 catalyst in combined steam and CO<SUB align="right">2 reforming of CH<SUB align="right">4

Cited by 15 publications

References 0 publications

Effect of NH3 Alkalization and MgO Promotion on the Performance of Ni/SBA-15 Catalyst in Combined Steam and Carbon Dioxide Reforming of Methane

Effect of NH3 Alkalization and MgO Promotion on the Performance of Ni/SBA-15 Catalyst in Combined Steam and Carbon Dioxide Reforming of Methane

Fabrication of Cobalt-Doped Ceria Nanorods for <i>p</i>-Xylene Deep Oxidation: Effects of Cobalt Precursor and Loading

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO2 Reforming of CH4

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Product

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Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO₂ Reforming of CH₄