Effect of calcium addition in plasma catalysis for toluene removal by Ni/ZSM-5 : Acidity/basicity, catalytic activity and reaction mechanism

Xu, Weicheng; Chen, Bingxu; Jiang, Xueding; Xu, Feng; Chen, Xin; Chen, Limin; Wu, Junliang; Fu, Mingli; Ye, Daiqi

doi:10.1016/j.jhazmat.2019.122004

Cited by 59 publications

(14 citation statements)

References 54 publications

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“…7 are due to their pore size and shape of the catalysts and the easiness of NiO loading. The fact indicated the incorporation of nickel oxide into Z, ZTPA, and ZCTA catalysts depict a bifunctional character consisting of acid and metal sites in agreement with Xu et al [56]. The acidity properties of zeolites indicated their catalytic potential for various hydrocarbon reactions.…”

Section: Hydrocracking Of Coconut Oilsupporting

confidence: 85%

Hydrocracking of Coconut Oil on the NiO/Silica-Rich Zeolite Synthesized Using a Quaternary Ammonium Surfactant

et al. 2020

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NiO/silica-rich zeolite catalysts were used for coconut oil hydrocracking. The catalyst was prepared with a mixture of Na2SiO3, Al(OH)3, NaOH, and quaternary ammonium surfactants. The surfactant was varied of types like as tetrapropylammonium bromide (TPAB) and cetyltrimethylammonium bromide (CTAB). The acidity of the silica-rich sodalite zeolites enhances with the increase in nickel oxide added through a wet impregnation. The hydrocracking process was carried out by a semi-batch method. Liquid products were analyzed using GC-MS. The results showed that the addition of surfactants increased the catalyst surface area and acidity. Meanwhile, the presence of nickel oxide increases the acidity of the catalyst. The hydrocracking results showed an increase in gas products when the surface area was high, i.e., 23.781% in silica-rich sodalite zeolite without template (Z), 32.68% in silica-rich sodalite zeolite with tetrapropylammonium (ZTPA), and 39.673% in silica-rich sodalite zeolite with cetyltrimethylammonium (ZCTA). The presence of NiO increased the liquid product and the selectivity of the bioavtur fraction (C10-C15), where the highest percentage of liquid product was 60.07% at NiO/ZTPA.

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Section: Hydrocracking Of Coconut Oilsupporting

confidence: 85%

Hydrocracking of Coconut Oil on the NiO/Silica-Rich Zeolite Synthesized Using a Quaternary Ammonium Surfactant

et al. 2020

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“…Pyridine molecules can coordinate with coordinatively unsaturated metal sites (Lewis acid sites) on the surface of metal oxides to form LPy species . Thus, Lewis acid sites in metal oxides should be attributed to coordinatively unsaturated metal sites exposed by surface oxygen vacancies. , The pyridine adsorption peaks around 1450 and 1620 cm –1 are attributed to Lewis acid sites . Pyridine molecules can also combine with surface hydroxyl groups (Brønsted acid sites) to form H-bonded HPy species.…”

Section: Resultsmentioning

confidence: 99%

“…45,46 The pyridine adsorption peaks around 1450 and 1620 cm −1 are attributed to Lewis acid sites. 47 Pyridine molecules can also combine with surface hydroxyl groups (Brønsted acid sites) to form Hbonded HPy species. The pyridine adsorption peaks around 1546 cm −1 are attributed to Brønsted acid sites.…”

Section: Acidity Characteristicsmentioning

confidence: 99%

Fabrication of Nanohybrid Spinel@CuO Catalysts for Propane Oxidation: Modified Spinel and Enhanced Activity by Temperature-Dependent Acid Sites

Wang

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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Modulating the catalyst electronic structure is a promising direction to enhance the catalytic oxidation performance. Herein, we report an innovative synthesis of the nanohybrid spinel@CuO catalyst with a broad biphasic interface for propane oxidation. The reaction rate of spinel@CuO catalyst was significantly increased compared to the physically mixed spinel+CuO catalyst. Lattice distortions and severe blurring of lattice fringes adjacent to the interface (between the spinel and CuO) comes with the spinel@CuO system, which enhanced interfacial interaction to form defect structures. The cobalt cations were selectively doped into the spinel lattice and occupied both the A and the B sites, while the CuO was not affected. At lower temperatures (∼200 °C), the enrichment of Brønsted acid sites increased the adsorption energy of propane. At higher temperatures (∼350 °C), the A and B sites cobalt weakened the Cu–O bond to make the oxygen vacancies form more readily, thereby enriching the Lewis acid sites. The substitution doping also resulted in lattice distortion in the spinel species, promoting the formation of a defect structure. The broad interface and temperature-dependent acid sites were conducive to propane oxidation.

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“…Volatile organic compounds (VOCs) lead to vast human diseases and environmental problems [1][2][3]. Humans exposed to VOCs for a long time can suffer from respiratory disorders, cardiovascular diseases, and cancer [4].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Benzene Using Dielectric Barrier Discharge Plasma Combined with Transition Metal Oxide Catalyst in Air

Yuan

Zhou

et al. 2022

Catalysts

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In this paper, a uniform and stable dielectric barrier discharge plasma is presented for degradation of benzene combined with a transition metal oxide catalyst. The discharge images, waveforms of discharge current, and the optical emission spectra are measured to investigate the plasma characteristics. The effects of catalyst types, applied voltage, driving frequency, and initial VOCs concentration on the degradation efficiency of benzene are studied. It is found that the addition of the packed dielectric materials can effectively improve the uniformity of discharge and enhance the intensity of discharge, thus promoting the benzene degradation efficiency. At 22 kV, the degradation efficiencies of dielectric barrier discharge plasma packed with CuO, ZnO and Fe3O4 are 93.6%, 93.2% and 76.2%, respectively. When packing with ZnO, the degradation efficiency of the dielectric barrier discharge plasma is improved from 86.8% to 94.9%, as the applied voltage increases from 16 kV to 24 kV. The catalysts were characterized by XPS, XRD and SEM. The synergistic mechanism and the property of the catalyst are responsible for benzene degradation in the plasma–catalysis system. In addition, the main physiochemical processes and possible degradation mechanism of benzene are discussed.

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Effect of calcium addition in plasma catalysis for toluene removal by Ni/ZSM-5 : Acidity/basicity, catalytic activity and reaction mechanism

Cited by 59 publications

References 54 publications

Hydrocracking of Coconut Oil on the NiO/Silica-Rich Zeolite Synthesized Using a Quaternary Ammonium Surfactant

Hydrocracking of Coconut Oil on the NiO/Silica-Rich Zeolite Synthesized Using a Quaternary Ammonium Surfactant

Fabrication of Nanohybrid Spinel@CuO Catalysts for Propane Oxidation: Modified Spinel and Enhanced Activity by Temperature-Dependent Acid Sites

Degradation of Benzene Using Dielectric Barrier Discharge Plasma Combined with Transition Metal Oxide Catalyst in Air

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