Physical mixing of TiO<sub>2</sub> with sponge nickel creates new active sites for selective CO methanation

Tada, Shohei; Shoji, Daiki; Urasaki, Kohei; Shimoda, Naohiro; Satokawa, Shigeo

doi:10.1039/c6cy00861e

Cited by 14 publications

(6 citation statements)

References 22 publications

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“…We expect that the N-derived species block the interfacial sites between Cu and a-ZrO 2 , resulting in a decrease in the number of the sites (Scheme ). A similar phenomenon was observed using Ni/TiO 2 catalysts for CO 2 methanation. , TiO 2 (Evonik, P-25) has surface Cl species, which prevent CO 2 from adsorbing on the catalyst surface and being hydrogenated.…”

Section: Results and Discussionsupporting

confidence: 68%

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Effects of Cu Precursor Types on the Catalytic Activity of Cu/ZrO₂ toward Methanol Synthesis via CO₂ Hydrogenation

Tada

Oshima

Noda

et al. 2019

Ind. Eng. Chem. Res.

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This paper presents the influence of different types of copper precursors on CO2-to-methanol hydrogenation over copper nanoparticles on amorphous ZrO2. Here, we chose copper nitrate hydrate, copper acetate hydrate, and a copper ammine complex as the precursor. A copper-acetate-based catalyst, which was precalcined at 350 °C, was more active and selective toward methanol than were the other catalysts. Regardless of the different copper precursors, after calcining a mixture of a copper precursor and amorphous ZrO2 at 350 °C, surface-dispersed Cu2+ species ([CuO4] square planes) were partly formed on amorphous ZrO2. The Cu2+ species was reduced by H2 to form Cu0 nanoparticles (<5 nm). This paper reports that using copper acetate monohydrate as a copper precursor leads to the greater number of active sites (Cu0a-ZrO2 interfacial sites) compared with the other precursors.

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Section: Results and Discussionsupporting

confidence: 68%

“…A similar phenomenon was observed using Ni/TiO 2 catalysts for CO 2 methanation. 79,80 TiO 2 (Evonik, P-25) has surface Cl species, which prevent CO 2 from adsorbing on the catalyst surface and being hydrogenated.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Effects of Cu Precursor Types on the Catalytic Activity of Cu/ZrO₂ toward Methanol Synthesis via CO₂ Hydrogenation

Tada

Oshima

Noda

et al. 2019

Ind. Eng. Chem. Res.

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“…SiCl 4 -NiAl-LDH displays all of the characteristic peaks of hydrotalcite albeit having slightly lower intensity, indicating that the deposition of SiCl 4 on the NiAl-LDH powder does not significantly affect the crystallinity of the sample. In addition, the characteristic peaks of SiO 2 were absent, indicating highly dispersed SiO 2 particles [ 33 ]. On the contrary, SiO 2 -NiAl-LDH exhibits lower crystallinity as shown by the broadening of the characteristic peaks.…”

Section: Resultsmentioning

confidence: 99%

Silica-Decorated NiAl-Layered Double Oxide for Enhanced CO/CO2 Methanation Performance

Yan

Zeng

et al. 2022

Nanomaterials

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CO/CO2 hydrogenation has attracted much attention as a pathway to achieve carbon neutrality and production of synthetic natural gas (SNG). In this work, two-dimensional NiAl layered double oxide (2D NiAl-LDO) has been successfully decorated by SiO2 nanoparticles derived from SiCl4 and used as CO/CO2 methanation catalysts. The as-obtained H-SiO2-NiAl-LDO exhibited a large specific surface area of 201 m2/g as well as high ratio of metallic Ni0 species and surface adsorption oxygen that were beneficial for low-temperature methanation of CO/CO2. The conversion of CO methanation was 99% at 400 °C, and that of CO2 was 90% at 350 °C. At 250 °C, the CO methanation reached 85% whereas that of CO2 reached 23% at 200 °C. We believe that this provides a simple method to improve the methanation performance of CO and CO2 and a strategy for the modification of other similar catalysts.

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“…Although it activates CO 2 efficiently, it is difficult to control the product selectivity over sponge nickel. To control the reaction pathways of CO 2 hydrogenation, we developed an approach of physically mixing metal oxide and sponge nickel . The success of the control is caused by the fact that new active sites between the metal oxide and sponge nickel were created only by physical mixing.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Effect in Mixing Sponge Copper with Amorphous ZrO₂Creates Effective Active Sites for Methanol Synthesis by CO₂Hydrogenation

et al. 2021

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For efficient methanol synthesis by CO 2 hydrogenation, catalysts prepared by mixing sponge copper and amorphous ZrO 2 were investigated. The commercial sponge copper itself exhibited catalytic activity for methanol synthesis by CO 2 hydrogenation. The sponge copper mixed with amorphous ZrO 2 in a mortar showed higher catalytic activity. Moreover, both CO 2 conversion and methanol selectivity were enhanced by wet milling using a planetary ball mill. Taking into consideration the structure, we found a mechanochemical interaction between the sponge copper and amorphous ZrO 2 by wet milling. These results showed that the strong interaction between the sponge copper and amorphous ZrO 2 caused by the mechanochemical treatment creates effective sites for methanol synthesis by CO 2 hydrogenation.

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Physical mixing of TiO₂ with sponge nickel creates new active sites for selective CO methanation

Abstract: Ni–α-Al2O3, Ni–SiO2, Ni–γ-Al2O3, Ni–TiO2, and Ni–ZrO2 were prepared by physical mixing of metal oxides with sponge Ni, and the effect of physical contact of the metal oxides with sponge Ni on selective CO methanation was examined.

Cited by 14 publications

References 22 publications

Effects of Cu Precursor Types on the Catalytic Activity of Cu/ZrO₂ toward Methanol Synthesis via CO₂ Hydrogenation

Effects of Cu Precursor Types on the Catalytic Activity of Cu/ZrO₂ toward Methanol Synthesis via CO₂ Hydrogenation

Silica-Decorated NiAl-Layered Double Oxide for Enhanced CO/CO2 Methanation Performance

Mechanochemical Effect in Mixing Sponge Copper with Amorphous ZrO₂Creates Effective Active Sites for Methanol Synthesis by CO₂Hydrogenation

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Physical mixing of TiO2 with sponge nickel creates new active sites for selective CO methanation

Abstract: Ni–α-Al2O3, Ni–SiO2, Ni–γ-Al2O3, Ni–TiO2, and Ni–ZrO2 were prepared by physical mixing of metal oxides with sponge Ni, and the effect of physical contact of the metal oxides with sponge Ni on selective CO methanation was examined.

Cited by 14 publications

References 22 publications

Effects of Cu Precursor Types on the Catalytic Activity of Cu/ZrO2 toward Methanol Synthesis via CO2 Hydrogenation

Effects of Cu Precursor Types on the Catalytic Activity of Cu/ZrO2 toward Methanol Synthesis via CO2 Hydrogenation

Silica-Decorated NiAl-Layered Double Oxide for Enhanced CO/CO2 Methanation Performance

Mechanochemical Effect in Mixing Sponge Copper with Amorphous ZrO2Creates Effective Active Sites for Methanol Synthesis by CO2Hydrogenation

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Physical mixing of TiO₂ with sponge nickel creates new active sites for selective CO methanation

Effects of Cu Precursor Types on the Catalytic Activity of Cu/ZrO₂ toward Methanol Synthesis via CO₂ Hydrogenation

Effects of Cu Precursor Types on the Catalytic Activity of Cu/ZrO₂ toward Methanol Synthesis via CO₂ Hydrogenation

Mechanochemical Effect in Mixing Sponge Copper with Amorphous ZrO₂Creates Effective Active Sites for Methanol Synthesis by CO₂Hydrogenation