Effect of a CeyNi1−yO2−δ solid solution on the oxidative cracking of vacuum residue over NiK/CeO2

Thi, Lien; Nguyen‐Huy, Chinh; Shin, Eun Woo

doi:10.1007/s11144-017-1252-5

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…It can also be seen that the CeO 2 (111) plane slightly shifts to higher 2θ values with the increase of the Ni/(Cu+Ni) molar ratio, suggesting the movement of smaller cation Ni 2+ (0.069 nm) into the CeO 2 lattice. 27,28 Meanwhile, a part of Cu also possibly enters into CeO 2 , due to the fact that Cu 2+ radius (0.073 nm) is smaller than Ce 4+ radius (0.087 nm). 29 All these can be confirmed by lattice parameters which are estimated by Bragg equation and a h k l d 2 2 2 = + + from the (111) plane position and shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

CO₂ Hydrogenation to Methanol over a Highly Active Cu–Ni/CeO₂–Nanotube Catalyst

Tan

Shi

2018

Ind. Eng. Chem. Res.

122

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A series of Cu−Ni/CeO 2 -nanotube catalysts is prepared by an impregnation method for CO 2 hydrogenation to CH 3 OH. Regular CeO 2 nanotubes are perfectly formed with a tube diameter of about 30−50 nm and Cu−Ni alloy is well dispersed on CeO 2 nanotube without nanotube morphology change. There is a synergistic effect between Ni and Cu, promoting the bimetallic Cu−Ni dispersion, reducibility, CO adsorption and hydrogenation. Additionally, a strong interaction is observed between Cu−Ni alloy and CeO 2 , and it contributes to partial reduction of Ce 4+ to Ce 3+ and formation of oxygen vacancies which adsorb and activate CO 2 . It is shown that both CO 2 conversion and CH 3 OH space-time yield increase at first, reach their maximum values at a Ni/ (Cu+Ni) ratio of 2/3, and then decrease with increasing the Ni/(Cu+Ni) ratio. The CeO 2 -nanotube supported CuNi 2 catalyst gives CO 2 conversion of 17.8% and CH 3 OH space-time yield of 18.1 mmol/(g cat •h) after preliminary optimization. Furthermore, it exhibits an excellent catalytic performance within a wide range of space velocity.

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Section: Methodsmentioning

confidence: 99%

CO₂ Hydrogenation to Methanol over a Highly Active Cu–Ni/CeO₂–Nanotube Catalyst

Tan

Shi

2018

Ind. Eng. Chem. Res.

122

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“…All numerical integration and stochastic optimization programs were written using ode45 and genetic algorithm (GA) commands through MATLAB version 2020a. Seven different experiments (5)(6)(7)(8)(9)(10)(11) were used in an acceptable prediction of the reaction kinetic parameters because they covered all the model variables (steam percent, reaction temperature, reaction time, and catalyst weight) as presented in Table 6. Fig.…”

Section: Analysis Of Kinetic Modelingmentioning

confidence: 99%

“…5. It can be recognized that the lowest VR conversion (25.8 wt%) was achieved at 400 °C while the maximum VR conversion (51.4 wt%) was achieved at 450 °C, 2 h, and Wc = 1.5 g. At maximum VR conversion, the weight percent…”

mentioning

confidence: 91%

“…The maximum conversion of 55. 5 wt% was given at 400 °C, 0.5 g catalyst, 6 h reaction time, and 20 g of water, and it was found that an accumulation of a mass of 61.2 wt% at 500 °C of the liquid product was accomplished by conversion of the light product with a low boiling point [4]. Do et al used a NiK/CeO 2 catalyst to investigate the interaction between a Ni metal, and CeO 2 support and its effect on the oxidative cracking of VR.…”

Section: Introductionmentioning

confidence: 99%

“…Do et al used a NiK/CeO 2 catalyst to investigate the interaction between a Ni metal, and CeO 2 support and its effect on the oxidative cracking of VR. The addition of NiK provided Ni metallic of hydrogenation and produced a lot of liquid products like diesel which was the highest one with 22.87 wt% without a catalyst [5]. Nguyen-Huy et al prepared and tested NiK/CeZr-Al catalysts cracking of the vacuum residue with steam using a fixed-bed reactor at 500 °C and 1 atm [6].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and kinetic study of vacuum residue cracking over zirconium based catalysts

Al-Karim

Shakor

Al–Sheikh

et al. 2022

Reac Kinet Mech Cat

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In this study, thermal cracking and catalytic cracking over zirconium-based catalysts of the vacuum residue were achieved in the presence of supercritical steam at 400-450 °C, 20 bar, and 2-4 h. Two different catalysts (ZrFeNi and ZrCoNi) were prepared using a sol-gel precipitation method and characterized using X-ray diffraction, EDX-spectrum, scanning electron microscopy, and BET surface area. The results showed the lowest VR conversion was achieved in the thermal cracking, catalytic cracking using ZrFeNi and catalytic cracking using ZrCoNi were 31.7, 35.3, and 38% while the highest VR conversion was achieved in the thermal cracking, catalytic cracking using ZrFeNi and catalytic cracking using ZrCoNi were 38.6, 71.1 and 76.3%. A new kinetic model of the eight lumps and 28 reaction steps were developed to describe the VR cracking while a genetic algorithm optimization method was used to predict the optimum set of kinetic parameters in which all computations were achieved using MATLAB version 2020a.

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Catalytic hydrocracking of pyrolytic lignin in supercritical methanol over nickel‑ruthenium/ceria-deposited HZSM-5

Thi

Choi

Suh

et al. 2023

Fuel Processing Technology

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Effect of a CeyNi1−yO2−δ solid solution on the oxidative cracking of vacuum residue over NiK/CeO2

Cited by 5 publications

References 19 publications

CO₂ Hydrogenation to Methanol over a Highly Active Cu–Ni/CeO₂–Nanotube Catalyst

CO₂ Hydrogenation to Methanol over a Highly Active Cu–Ni/CeO₂–Nanotube Catalyst

Experimental and kinetic study of vacuum residue cracking over zirconium based catalysts

Catalytic hydrocracking of pyrolytic lignin in supercritical methanol over nickel‑ruthenium/ceria-deposited HZSM-5

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Effect of a CeyNi1−yO2−δ solid solution on the oxidative cracking of vacuum residue over NiK/CeO2

Cited by 5 publications

References 19 publications

CO2 Hydrogenation to Methanol over a Highly Active Cu–Ni/CeO2–Nanotube Catalyst

CO2 Hydrogenation to Methanol over a Highly Active Cu–Ni/CeO2–Nanotube Catalyst

Experimental and kinetic study of vacuum residue cracking over zirconium based catalysts

Catalytic hydrocracking of pyrolytic lignin in supercritical methanol over nickel‑ruthenium/ceria-deposited HZSM-5

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Product

Resources

About

CO₂ Hydrogenation to Methanol over a Highly Active Cu–Ni/CeO₂–Nanotube Catalyst

CO₂ Hydrogenation to Methanol over a Highly Active Cu–Ni/CeO₂–Nanotube Catalyst