Degradation of Formaldehyde over MnO<sub>2</sub>/CeO<sub>2</sub> Hollow Spheres: Elucidating the Influence of Carbon Sphere Self-Sacrificing Templates

Zhu, Chen; Guan, Shengnan; Li, Wenzhi; Ogunbiyi, Ajibola T.; Zhang, Qi

doi:10.1021/acsomega.1c04769

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…Therefore, it can be speculated that the formation process of methyl is the decisive step in the reaction. After methane and oxygen were introduced together and kept for a few minutes, a brand-new signal peak appeared around 3260 cm –1 , which indicated an isolated hydroxyl group, , and maintained a high level for a long time. This isolated hydroxyl group, which is connected with the terminal metal and generated at the unsaturated coordination site, may be beneficial to the formation of methanol.…”

Section: Resultsmentioning

confidence: 99%

Direct Catalytic Oxidation of Low-Concentration Methane to Methanol in One Step on Ni-Promoted BiOCl Catalysts

Zhu

Guo

et al. 2023

ACS Omega

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The direct oxidation of low-concentration methane (CH 4 ) to methanol (CH 3 OH) is often regarded as the “holy grail”. However, it still is very difficult and challenging to oxidize methane to methanol in one step. In this work, we present a new approach to directly oxidize CH 4 to generate CH 3 OH in one step by doping non-noble metal Ni sites on bismuth oxychloride (BiOCl) equipped with high oxygen vacancies. Thereinto, the conversion rate of CH 3 OH can reach 39.07 μmol/(g cat ·h) under 420 °C and flow conditions on the basis of O 2 and H 2 O. The crystal morphology structure, physicochemical properties, metal dispersion, and surface adsorption capacity of Ni–BiOCl were explored, and the positive effect on the oxygen vacancy of the catalyst was proved, thus improving the catalytic performance. Furthermore, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was also performed to study the surface adsorption and reaction process of methane to methanol in one step. Results demonstrate that the key to keep good activity lies in the oxygen vacancies of unsaturated Bi atoms, which can adsorb and active CH 4 and to produce methyl groups and adsorbing hydroxyl groups in methane oxidation process. This study broadens the application of oxygen-deficient catalysts in the catalytic conversion of CH 4 to CH 3 OH in one step, which provides a new perspective on the role of oxygen vacancies in improving the catalytic performance of methane oxidation.

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Section: Resultsmentioning

confidence: 99%

Direct Catalytic Oxidation of Low-Concentration Methane to Methanol in One Step on Ni-Promoted BiOCl Catalysts

Zhu

Guo

et al. 2023

ACS Omega

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“…[23][24][25][26][27] Although little progress has been made in terms of synthesis and catalytic performance of CeO 2 -MnO x hollow nanospheres, the asobtained materials could not possess homogeneous structure, including uniform morphology, diameter, and interior architecture. 28,29 In this paper, we prepared well-dened CeMnO x hollow nanospheres with different amounts of MnO x by the combination of template method and interfacial reaction. Toluene was chosen as the target contaminant for catalytic oxidation.…”

Section: Introductionmentioning

confidence: 99%

Template and interfacial reaction engaged synthesis of CeMnO_x hollow nanospheres and their performance for toluene oxidation

et al. 2022

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“…7 Three typical synthesis methods of hollow spheres include hardtemplating methods, 8,9 soft-templating methods, 10 and template-free methods. 2 The hard-templating methods usually utilize "rigid" materials such as carbon spheres, 11 SiO 2 spheres, 12 gelatin spheres, 13 and so on as templates to prepare Co 3 O 4 @CdS, 14 Co 3 O 4 11 Ce 1−x Zr x O 2 , 15 and RuO 2 16 hollow spheres. The soft template methods typically involve the formation of relatively flexible structures, such as emulsion droplets, 17 supramolecular micelles, 18,19 and vesicles 20 as templates.…”

Section: Introductionmentioning

confidence: 99%

Scalable Preparation of Sub-Millimeter Double-Shelled Al₂O₃ Hollow Spheres and Their Rapid Separation from Wastewater after Adsorption of Congo Red

Yan

Guo

et al. 2022

ACS Omega

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Porous double-shelled ceramic hollow spheres (PDSs) have attracted extensive attention due to their high specific surface areas and multifunctional designs. When used in wastewater treatment, millimeter or sub-millimeter spheres can be quickly separated from water by commercial sieves. However, the simple, scalable, and low-cost preparation of sub-millimeter PDSs in the solid phase remains a challenge. Herein, porous PDSs were facilely fabricated via a spheronization process utilizing pseudoboehmite powders and wet gelatin spheres as templates, which broke through the difficulty of preparing PDSs by one-step solid-state synthesis. Treating pseudoboehmite powder with nitric acid can improve the compressive strength of the PDSs. By controlling the rolling time and gelatin concentration of gelatin microspheres, the integrity, shell thickness, and double-shelled spacing of the gelatin microspheres were tuned. When the rolling time was 8–12 min, and the gelatin concentration in gelatin spheres was 250 g/L, and PDSs with a complete double-shelled structure, good mechanical property, and high specific surface area (327.5–509.6 m2/g) were obtained at 600 °C. The adsorption capacities of the PDSs for 100 mg/L Congo red solution (70.7 mg/g) were larger than those of single-shelled hollow spheres (49 mg/g), and larger diameters (608–862 μm) of the PDSs allow them to be rapidly separated from solution by a commercial sieve. This paper provides a facile and scalable method for the preparation of sub-millimeter PDSs and demonstrates their excellent adsorption capacity for Congo red solution.

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Degradation of Formaldehyde over MnO₂/CeO₂ Hollow Spheres: Elucidating the Influence of Carbon Sphere Self-Sacrificing Templates

Cited by 9 publications

References 29 publications

Direct Catalytic Oxidation of Low-Concentration Methane to Methanol in One Step on Ni-Promoted BiOCl Catalysts

Direct Catalytic Oxidation of Low-Concentration Methane to Methanol in One Step on Ni-Promoted BiOCl Catalysts

Template and interfacial reaction engaged synthesis of CeMnO_x hollow nanospheres and their performance for toluene oxidation

Scalable Preparation of Sub-Millimeter Double-Shelled Al₂O₃ Hollow Spheres and Their Rapid Separation from Wastewater after Adsorption of Congo Red

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Degradation of Formaldehyde over MnO2/CeO2 Hollow Spheres: Elucidating the Influence of Carbon Sphere Self-Sacrificing Templates

Cited by 9 publications

References 29 publications

Direct Catalytic Oxidation of Low-Concentration Methane to Methanol in One Step on Ni-Promoted BiOCl Catalysts

Direct Catalytic Oxidation of Low-Concentration Methane to Methanol in One Step on Ni-Promoted BiOCl Catalysts

Template and interfacial reaction engaged synthesis of CeMnOx hollow nanospheres and their performance for toluene oxidation

Scalable Preparation of Sub-Millimeter Double-Shelled Al2O3 Hollow Spheres and Their Rapid Separation from Wastewater after Adsorption of Congo Red

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Degradation of Formaldehyde over MnO₂/CeO₂ Hollow Spheres: Elucidating the Influence of Carbon Sphere Self-Sacrificing Templates

Template and interfacial reaction engaged synthesis of CeMnO_x hollow nanospheres and their performance for toluene oxidation

Scalable Preparation of Sub-Millimeter Double-Shelled Al₂O₃ Hollow Spheres and Their Rapid Separation from Wastewater after Adsorption of Congo Red