Influence of niobium on carbon nanofibres based Cu/ZrO 2 catalysts for liquid phase hydrogenation of CO 2 to methanol

Din, Israf Ud; Shaharun, Maizatul Shima; Subbarao, Duvvuri; Akhtar, Naeem; Fida, Hussain

doi:10.1016/j.cattod.2015.06.019

Cited by 52 publications

(12 citation statements)

References 47 publications

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“…Various promoters reported by different authors for CH 3 OH synthesis catalysts include gallium oxide (Ga 2 O 3 ), [68][69][70][71] zinc oxide (ZnO), [72][73][74][75][76][77] and niobium oxide (Nb 2 O 5 ). 78,79 The synthesis and experimental details of some commonly used catalysts are briefed in the subsequent sub-sections.…”

Section: A Tour On Catalyst Development For Co 2 Hydrogenation Reactionmentioning

confidence: 99%

An insight of CO ₂ hydrogenation to methanol synthesis: Thermodynamics, catalysts, operating parameters, and reaction mechanism

Kanuri

Roy

Chakraborty

et al. 2021

Intl J of Energy Research

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Catalytic hydrogenation of CO 2 to methanol is an exciting avenue to curb the rising CO 2 emissions and generate renewable energy or value-added products.Methanol synthesis via the thermal catalysis route gets increasing emphasis due to its fast kinetics and flexible combination of active components. In the last decade, many studies on CO 2 hydrogenation to methanol have been reported with different kinds of catalysts that have been synthesized and characterized using state-of-the-art surface science tools and techniques. In situ analysis techniques as well as theoretical (eg, density functional theory, Monte Carlo simulations, and Micro-Kinetics modeling) studies have been performed to understand the insights of morphology changes, the interaction of active sites, and the formation of intermediate species under the reaction conditions. In the present review, the advancements on CO 2 to methanol via hydrogenation route have been presented taking into consideration different perspectives spanning across thermodynamic aspects, the influence of reaction temperature, pressure, feed composition, space-velocity, and morphologically tuned novel catalyst on CO 2 conversion and methanol selectivity. Among the reported catalysts, the Al 2 O 3 -supported Cu-Zn catalyst showed better performance with 25% CO 2 conversion and 73% methanol selectivity at 170 C and 50 bar pressure. The CeO 2 -supported Pd-Zn catalyst showed 14% CO 2 conversion and 97% methanol selectivity at 220 C under 20 bar pressure. Also, CeO 2nanorods supported Cu-Ni catalyst showed good performance at 260 C and 30 bars, with around 18% CO 2 conversion and 73% methanol selectivity. Addi-

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Section: A Tour On Catalyst Development For Co 2 Hydrogenation Reactionmentioning

confidence: 99%

An insight of CO ₂ hydrogenation to methanol synthesis: Thermodynamics, catalysts, operating parameters, and reaction mechanism

Kanuri

Roy

Chakraborty

et al. 2021

Intl J of Energy Research

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“…As a measure of catalytic efficiency relative to available sites, the turnover frequency (TOF) was calculated using the following expression (Equation 2): where XCO represents the CO conversion, FCO is the CO flow (mol.s −1 ), Na is Avogadro's number (6.023 × 10 23 atm.mol −1 ), mcat is the weight of catalysts, Scu denotes metallic copper surface area (m 2 .g −1 ), and na designates the number of Cu atoms in a monolayer (1.469 × 10 19 atoms.m −2 ). 33 Rates of reaction for the overall WGS reaction on SrTi1−xCuxO3 catalysts with x = 0.15, 0.20 and 0.30 at 200 °C and 1 atm total pressure were measured under differential conditions (conversion < 10%). WGS rates were normalized by the metallic copper area (mol CO m −2 (Cu) s −1 )).…”

Section: Catalytic Activity Measurementsmentioning

confidence: 99%

“…The CO conversion was kept below 10%. As a measure of catalytic efficiency relative to available sites, the turnover frequency (TOF) was calculated using the following expression where X CO represents the CO conversion, F CO is the CO flow (mol·s –1 ), N a is Avogadro’s number (6.023 × 10 23 atm·mol –1 ), m cat is the weight of catalysts, S Cu denotes the metallic copper surface area (m 2 ·g –1 ), and n a designates the number of Cu atoms in a monolayer (1.469 × 10 19 atoms·m –2 ) …”

Section: Experimental and Computational Settingsmentioning

confidence: 99%

Cu-Modified SrTiO₃Perovskites Toward Enhanced Water–Gas Shift Catalysis: A Combined Experimental and Computational Study

Coletta

Gonçalves

Bernardi

et al. 2020

ACS Appl. Energy Mater.

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The water-gas shift reaction (WGS) is important and widely applied in the production of H2. Cu-modified perovskites are promising catalysts for WGS reactions in hydrogen generation. However, the structure-dependent stability and reaction pathways of such materials remain unclear. Herein, we report catalytically active Cu-modified SrTiO3 (nominally SrTi1−xCuxO3) prepared by a modified polymeric precursor method. Microstructural analysis revealed a partially segregated CuO phase in the as-prepared materials. Operando X-ray diffraction and absorption spectroscopy showed the reduction of CuO into a stable metallic phase under conditions of WGS reactions for all compositions. Among the characterized materials, the x = 0.20 composition showed the highest turnover frequency, lowest activation energy, and the highest WGS rate at 300 °C. According to density functional calculations, the formation of CuO is energetically less favorable compared with, SrTiO3, explaining why the segregated CuO phase on the SrTiO3 surface is reduced to Cu during the catalytic reaction, while SrTiO3 remains. For x = 0.20, the size of the segregated CuO phase is optimum for facilitating the catalytic reaction. In contrast, a higher Cu content (x = 0.3) results in an aggregation of smaller CuO particles, resulting in fewer surface active sites and a net decrease in catalytic performance.

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“…Deposition precipitation method was adopted to synthesize CNF-based Cu/ZrO 2 catalysts. The detailed procedure for catalysts synthesis has been documented elsewhere [14][15][16]. Catalysts Cu•ZrO 2 /CNFs with 15 wt% each of Cu and ZrO 2 with CNFs as a support were synthesized.…”

Section: Catalysts Synthesismentioning

confidence: 99%

Effect of reaction conditions on the activity of novel carbon nanofiber-based Cu/ZrO2 catalysts for CO2 hydrogenation to methanol

Din¹,

Shaharun²,

Akhtar³

et al. 2020

Comptes Rendus. Chimie

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The increasing concentrations of CO 2 in the environment result in catastrophic phenomena like global warming. Hydrogenation of emitted CO 2 to methanol is one of the economically viable strategies to tackle the problem. In the current work, methanol synthesis by CO 2 hydrogenation was studied over carbon nanofiber-based Cu/ZrO 2 catalysts. The effect on rate of reaction by varying reaction temperature, reaction pressure, and feed gas ratio were investigated. Rate of reaction increased with increasing temperature and 220°C was found as an optimum reaction temperature. The study revealed a linear relationship between the rate of reaction and applied pressure of the feed gases. The rate of reaction was accelerated by increasing feed gas ratio and the highest activity was recorded for H 2 /CO 2 = 3.

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Influence of niobium on carbon nanofibres based Cu/ZrO 2 catalysts for liquid phase hydrogenation of CO 2 to methanol

Cited by 52 publications

References 47 publications

An insight of CO ₂ hydrogenation to methanol synthesis: Thermodynamics, catalysts, operating parameters, and reaction mechanism

An insight of CO ₂ hydrogenation to methanol synthesis: Thermodynamics, catalysts, operating parameters, and reaction mechanism

Cu-Modified SrTiO₃Perovskites Toward Enhanced Water–Gas Shift Catalysis: A Combined Experimental and Computational Study

Effect of reaction conditions on the activity of novel carbon nanofiber-based Cu/ZrO2 catalysts for CO2 hydrogenation to methanol

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Influence of niobium on carbon nanofibres based Cu/ZrO 2 catalysts for liquid phase hydrogenation of CO 2 to methanol

Cited by 52 publications

References 47 publications

An insight of CO 2 hydrogenation to methanol synthesis: Thermodynamics, catalysts, operating parameters, and reaction mechanism

An insight of CO 2 hydrogenation to methanol synthesis: Thermodynamics, catalysts, operating parameters, and reaction mechanism

Cu-Modified SrTiO3Perovskites Toward Enhanced Water–Gas Shift Catalysis: A Combined Experimental and Computational Study

Effect of reaction conditions on the activity of novel carbon nanofiber-based Cu/ZrO2 catalysts for CO2 hydrogenation to methanol

Contact Info

Product

Resources

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An insight of CO ₂ hydrogenation to methanol synthesis: Thermodynamics, catalysts, operating parameters, and reaction mechanism

An insight of CO ₂ hydrogenation to methanol synthesis: Thermodynamics, catalysts, operating parameters, and reaction mechanism

Cu-Modified SrTiO₃Perovskites Toward Enhanced Water–Gas Shift Catalysis: A Combined Experimental and Computational Study