Evaluation of modified Ni/ZrO2 catalysts for hydrogen production by supercritical water gasification of oil-containing wastewater

Kou, Jiajing; Xu, Jialing; Jin, Hui; Zhang, Deming; Cao, Wen

doi:10.1016/j.ijhydene.2017.12.021

Cited by 48 publications

(13 citation statements)

References 52 publications

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“…All the catalysts showed the same characteristic peaks at 30.5, 35.2, 50.6, and 60.3°, corresponding to tetragonal ZrO 2 . 19 The diffraction peaks corresponding to 2θ values of 29.1, 31.6, 40.6, 51.9, 71.4, and 76.6°show the presence of nickel. This indicates the reduction of Ni 2+ to Ni 0 .…”

Section: Methodsmentioning

confidence: 99%

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Catalytic Supercritical Water Gasification of Soybean Straw: Effects of Catalyst Supports and Promoters

Okolie

Mukherjee

Nanda

et al. 2021

Ind. Eng. Chem. Res.

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Supercritical water gasification is a hydrothermal process to gasify complex organic biomass to produce hydrogen-rich syngas. This study reports the catalytic performance and hydrogen selectivity of several Ni-based catalysts during supercritical water gasification of soybean straw. All experiments were performed at a temperature, an average biomass particle size, a feedstock/water ratio, and a residence time 500 °C, 0.13 mm, 1:10, and 45 min, respectively. A comprehensive screening of different support materials ranging from activated carbon (AC), carbon nanotubes (CNTs), ZrO2, Al2O3, SiO2, and Al2O3–SiO2 was performed at 10 wt % Ni loading. The effectiveness of each support in improving H2 yield and selectivity was in the order ZrO2 > Al2O3 > AC > CNT > SiO2 > Al2O3–SiO2. The effects of adding three promoters (i.e., Na, K, and Ce) to the supported Ni/ZrO2 and Ni/Al2O3 catalysts were evaluated. In terms of H2 yield, the performance of each promoter for Ni/ZrO2 catalysts was in the order Ce (10.9 mmol/g) > K (10.3 mmol/g) > Na (9.5 mmol/g). Cerium showed better performance in promoting H2 yield and minimizing coke deposition on the support. The addition of K, Na, and Ce promoters elevated Ni dispersion and the metallic surface area, thus improving H2 yields.

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Section: Methodsmentioning

confidence: 99%

“…The Ni/ ZrO 2 catalyst was used to improve the carbon gasification efficiency (CGE) of SCWG of diesel. 19 Al 2 O 3 is widely used as a catalyst support for steam reforming of methane. 20 The Ni/ SiO 2 catalyst elevated H 2 yield by 57 wt % during subcritical water gasification of glucose.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Supercritical Water Gasification of Soybean Straw: Effects of Catalyst Supports and Promoters

Okolie

Mukherjee

Nanda

et al. 2021

Ind. Eng. Chem. Res.

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“…The catalytic activity of Ni/ZrO 2 with Co promoters was tested for the gasification of oil-containing wastewater at 823 K. Carbon gasification efficiency as high as 98.8% was obtained after 30 min. Actually, it was found that all tested Ni-based catalysts are highly active for the C-C cleavage and water gas shift reaction [124].…”

Section: Metal-based Catalysts For Scwgmentioning

confidence: 99%

Functional Materials for Waste-to-Energy Processes in Supercritical Water

et al. 2021

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In response to increasing energy demand, various types of organic wastes, including industrial and municipal wastewaters, or biomass wastes, are considered reliable energy sources. Wastes are now treated in supercritical water (SCW) for non-fossil fuel production and energy recovery. Considering that SCW technologies are green and energetically effective, to implement them on a large scale is a worldwide interest. However, issues related to the stability and functionality of materials used in the harsh conditions of SCW reactors still need to be addressed. Here we present an overview on materials used in the SCW technologies for energy harvesting from wastes. There are catalysts based on metals or metal oxides, and we discuss on these materials’ efficiency and selectivity in SCW conditions. We focus on processes relevant to the waste-to-energy field, such as supercritical water gasification (SCWG) and supercritical water oxidation (SCWO). We discuss the results reported, mainly in the last decades in connection to the current concept of supercritical pseudo-boiling (PB), a phenomenon occurring at the phase change from liquid-like (LL) to gas-like (GL) state of a fluid. This review aims to be a useful database that provides guidelines for the selection of the abovementioned functional materials (catalysts, catalyst supports, and sorbents) for the SCW process, starting from wastes and ending with energy-relevant products.

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“…Advanced oxidation is one of the feasible methods to pretreat coal chemical wastewater. Commonly used advanced oxidation processes include ozone catalytic oxidation, Fenton/Fenton-like reaction, ultraviolet photocatalysis, and electrochemical oxidation (Hervy et al, 2018;Kou et al, 2018). The rapid development of ozone catalytic oxidation has become a powerful tool for the efficient treatment of refractory organics in advanced oxidation processes (Wei et al, 2019).…”

Section: Research Articlementioning

confidence: 99%

Ozone catalytic oxidation capacity of Ti‐Co@Al₂O₃ for the treatment of biochemical tailwater from the coal chemical industry

Sun

Zhou

Sun

et al. 2020

Water Environment Research

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A Ti‐Co@γ‐Al2O3 composite catalyst was prepared using impregnation and sol‐gel methods to degrade biochemical tailwater from the coal chemical industry, and its preparation conditions (active component doping ratio, load times, and calcination temperature) were optimized through single‐factor experiments. The surface properties of the Ti‐Co@γ‐Al2O3 composite catalyst and the crystal structure characteristics of the catalytically active components were characterized via scanning electron microscopy–energy dispersive spectrometry, X‐ray diffraction, and X‐ray fluorescence. The effects of reaction time, initial pH, ozone aeration, and catalyst dosage on degradation performance were investigated through an experiment on the catalytic ozonation degradation of biochemical tail water. Results showed that the optimal conditions were as follows: reaction time of 30 min, pH of 8.2, ozone aeration of 30 mg/min, and catalyst dosage of 20 g/L. The total phenol and total organic carbon removal rates for biochemical tailwater were 66.1% and 57.6%, respectively, in the catalytic system. The mechanism of degradation of organic pollutants by catalytic ozonation was investigated by adding tert‐butanol to the catalytic ozone oxidation system. The degradation of chemical oxygen demand in biochemical tailwater was caused primarily by the synergy between the Ti‐Co@γ‐Al2O3 catalyst and ozone. Practitioner points Ti‐Co/γ‐Al2O3 catalyst was prepared for the catalytic oxidation of biochemical tail water. The optimal removal rates of total phenol and TOC were 67.7% and 58.8%, respectively. The organic matter was degraded rapidly and efficiently after 5 min of ozone catalytic oxidation reaction. It provides theoretical guidance for the practical application of ozone catalytic oxidation.

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Evaluation of modified Ni/ZrO2 catalysts for hydrogen production by supercritical water gasification of oil-containing wastewater

Cited by 48 publications

References 52 publications

Catalytic Supercritical Water Gasification of Soybean Straw: Effects of Catalyst Supports and Promoters

Catalytic Supercritical Water Gasification of Soybean Straw: Effects of Catalyst Supports and Promoters

Functional Materials for Waste-to-Energy Processes in Supercritical Water

Ozone catalytic oxidation capacity of Ti‐Co@Al₂O₃ for the treatment of biochemical tailwater from the coal chemical industry

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Evaluation of modified Ni/ZrO2 catalysts for hydrogen production by supercritical water gasification of oil-containing wastewater

Cited by 48 publications

References 52 publications

Catalytic Supercritical Water Gasification of Soybean Straw: Effects of Catalyst Supports and Promoters

Catalytic Supercritical Water Gasification of Soybean Straw: Effects of Catalyst Supports and Promoters

Functional Materials for Waste-to-Energy Processes in Supercritical Water

Ozone catalytic oxidation capacity of Ti‐Co@Al2O3 for the treatment of biochemical tailwater from the coal chemical industry

Contact Info

Product

Resources

About

Ozone catalytic oxidation capacity of Ti‐Co@Al₂O₃ for the treatment of biochemical tailwater from the coal chemical industry