Impact of double-solvent impregnation on the Ni dispersion of Ni/SBA-15 catalysts and catalytic performance for the syngas methanation reaction

Tao, Miao; Xin, Zhong; Meng, Xin; Lv, Yuhao; Bian, Zhicheng

doi:10.1039/c6ra04490e

Cited by 33 publications

(15 citation statements)

References 32 publications

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“…Similarly, just as previously reported, 26 the ImU samples present also two peaks, in these cases at lower temperature and with similar intensities. In Ni/SBA-15-ImU these peaks are centered at 375 and 525 o C, and in Ni/SiO 2 -ImU centered at 375 and 460 o C.…”

Section: Study Of the Reduction Processes And The Reduced Catalytic Ssupporting

confidence: 90%

“…[20][21][22][23][24][25] In this sense, the use of mesoporous supports has been proposed as good alternative for the improvement of catalytic performance. 26,27 Typically presenting a very high surface area and a variable size of the porosity, 28 these kind of materials could also play a role controlling the size of the metallic particles. Its location on the external surface of these supports or in their internal mesoporosity affects the shape and size of the metal particles, thus modifying the catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

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Nickel Particles Selectively Confined in the Mesoporous Channels of SBA-15 Yielding a Very Stable Catalyst for DRM Reaction

2017

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A series of four Ni catalysts supported on SBA-15 and on a high SiO surface area have been prepared by modified impregnation (ImU) and deposition-precipitation (DP) methods. The catalysts have been extensively characterized, including in situ XAS (bulk sensitive) and XPS (surface sensitive) techniques, and their catalytic activities evaluated in the dry reforming reaction of methane (DRM). The combined use of XPS and XAS has allowed us to determine the location of nickel particles on each catalyst after reduction at high temperature (750 °C). Both Ni/SiO-DP and Ni/SBA-15-DP catalysts yield well-dispersed and homogeneous metallic phases mainly located in the mesoporosity of both supports. On the contrary, the Ni/SiO-ImU and Ni/SBA-15-ImU catalysts present a bimodal distribution of the reduced nickel phase, with nickel metallic particles located out and into the mesoporous structure of SiO or the SBA-15 channels. The Ni/SBA-15-DP catalyst was found the most stable and performing system, with a very low level of carbon deposition, about an order of magnitude lower than the equivalent ImU catalyst. This outstanding performance comes from the confinement of small and homogeneous nickel particles in the mesoporous channels of SBA-15, which, in strong interaction with the support, are resistant to sintering and coke deposition during the demanding reaction conditions of DRM.

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Section: Study Of the Reduction Processes And The Reduced Catalytic Ssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Nickel Particles Selectively Confined in the Mesoporous Channels of SBA-15 Yielding a Very Stable Catalyst for DRM Reaction

2017

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“…For Ni-CeO 2 /SBA-15-V, a reduction peak between 300 °C and 600 °C was observed. A reduction peak beyond 500 °C corresponds to the reduction of small NiO particles strongly interacting with SiO 2 support [ 28 , 29 , 30 , 31 , 32 , 33 ]. The result indicates that there is a strong interaction between Ni and SiO 2 in Ni-CeO 2 /SBA-15-V catalyst.…”

Section: Resultsmentioning

confidence: 99%

Vacuum Thermal Treated Ni-CeO2/SBA-15 Catalyst for CO2 Methanation

Wang

Liu

et al. 2018

Nanomaterials

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Ni-CeO2/SBA-15-V catalyst was prepared by the impregnation method with vacuum thermal treatment and used for CO2 methanation reaction. Compared with Ni-CeO2/SBA-15-air catalyst with thermal treatment in air, the reduced Ni-CeO2/SBA-15-V catalyst with vacuum thermal treatment exhibited higher Ni dispersion and smaller Ni particle size. In CO2 methanation reaction, the Ni-CeO2/SBA-15-V catalyst was more active and selective than the Ni-CeO2/SBA-15-air catalyst. The good activity and selectivity of Ni-CeO2/SBA-15-V catalyst should be due to highly dispersed Ni in contact with small CeO2 particles.

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“…The 1%Ni/SBA-15 had a sharp peak mainly located at 420 • C, assigned to the reduction peak of large particles of NiO [31,32]. The broad reduction peak of the 1%Ni/SBA-15(P) catalyst was between 300-650 • C, and the reduction peak of more than 500 • C was attributed to the reduction of highly dispersed NiO, which had a strong interaction with the SiO 2 [31,[33][34][35][36]. The TPR results show that Ni was strongly interacted with the support of SiO 2 in the 1%Ni/SBA-15(P) [21,37].…”

Section: Catalytic Performancementioning

confidence: 99%

Highly Dispersed and Stable Ni/SBA-15 Catalyst for Reverse Water-Gas Shift Reaction

Liu

Wang

2021

Crystals

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A 1%Ni/SBA-15(P) catalyst was synthesized with a P123-assisted impregnation method, which exhibited high CO2 conversion and stability in the reverse water-gas shift reaction. For the 1%Ni/SBA-15(P) catalyst, TEM and TPR characterizations demonstrated that the highly dispersed NiO particles at about 3 nm strongly interacted with the SiO2 support. During reverse water-gas shift reaction, the 1%Ni/SBA-15(P) catalyst exhibited higher CO2 conversion than the 1%Ni/SBA-15 catalyst prepared by the conventional impregnation method without P123. The CO2 conversion of the 1%Ni/SBA-15(P) catalyst at 700 °C was 33.7%, which was three times that of the 1%Ni/SBA-15 catalyst. Moreover, the former catalyst was stable at 700 °C within 1000 min. The good activity and stability of the 1%Ni/SBA-15(P) catalyst was owing to small Ni particles that strongly interacted with SBA-15.

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Impact of double-solvent impregnation on the Ni dispersion of Ni/SBA-15 catalysts and catalytic performance for the syngas methanation reaction

Abstract: Ni/SBA-15 prepared by a double-solvent impregnation method showed excellent activity for CO methanation and catalyst sintering was the main cause of deactivation.

Cited by 33 publications

References 32 publications

Nickel Particles Selectively Confined in the Mesoporous Channels of SBA-15 Yielding a Very Stable Catalyst for DRM Reaction

Nickel Particles Selectively Confined in the Mesoporous Channels of SBA-15 Yielding a Very Stable Catalyst for DRM Reaction

Vacuum Thermal Treated Ni-CeO2/SBA-15 Catalyst for CO2 Methanation

Highly Dispersed and Stable Ni/SBA-15 Catalyst for Reverse Water-Gas Shift Reaction

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