Regulation of the reaction pathway to design the high sulfur/coke-tolerant Ce-based catalysts for decomposing sulfur-containing VOCs

Cao, Xiaohua; Lu, Jichang; Zheng, Xiangqian; He, Dedong; Zhu, Wenjie; Zhao, Ye; Zhang, Wenjun; Tian, Rui; Luo, Yongming

doi:10.1016/j.cej.2021.132473

Cited by 16 publications

(6 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ceria-based catalysts are widely used in the catalytic degradation of various gaseous pollutants due to their excellent redox ability and oxygen storage capacity. 14 Numerous studies revolve around Ce-based oxides, such as pure CeO 2 , 15 nano CeO 2 with special morphologies, 16 supported CeO 2 (Pt 3 Sn/ CeO 2 and Ru/CeO 2 ), 17,18 and CeO 2 -based composite oxides (CeO 2 @Co 3 O 4 and CuO-CeO 2 ). 19,20 However, pure CeO 2 suffers from poor stability because of the easy sintering at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Ceria-based catalysts are widely used in the catalytic degradation of various gaseous pollutants due to their excellent redox ability and oxygen storage capacity . Numerous studies revolve around Ce-based oxides, such as pure CeO 2 , nano CeO 2 with special morphologies, supported CeO 2 (Pt 3 Sn/CeO 2 and Ru/CeO 2 ), , and CeO 2 -based composite oxides (CeO 2 @Co 3 O 4 and CuO-CeO 2 ). , However, pure CeO 2 suffers from poor stability because of the easy sintering at high temperatures . Therefore, the solid solution fabricated from Ce and other transition metals such as Ti and Zr as well as thermostability is featured, which is promising to solve this issue if their inferior activity could be improved.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Expediting Toluene Combustion by Harmonizing the Ce–O Strength over Co-Doped CeZr Oxide Catalysts

Shen

Deng

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

Low-temperature catalytic degradation of volatile organic compounds (VOCs) by enhancing the activity of non-precious metal catalysts has always been the focus of attention. The mineralization of aromatic VOCs requires the participation of a large number of oxygen atoms, so the activation of oxygen species is crucial in the degradation reaction. Herein, we originally adjust the Ce–O bond strength in CeZr oxide catalysts by cobalt doping to promote the activation of oxygen species, thus improving the toluene degradation performance while maintaining high stability. Subsequent characterizations and theoretical calculations demonstrate that the weakening of the Ce–O bond strength increases the oxygen vacancy content, promotes the activation of oxygen species, and enhances the redox ability of the catalysts. This strategy also promotes the activation of toluene and accelerates the depletion of intermediate species. This study will contribute a strategy to enhance the activation ability of oxygen species in non-noble metal oxide catalysts, thereby enhancing the degradation performance of VOCs.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Expediting Toluene Combustion by Harmonizing the Ce–O Strength over Co-Doped CeZr Oxide Catalysts

Shen

Deng

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In situ DRIFT spectra of the desorption of CH 3 SH + O 2 are also conducted as the function of temperature (Figure S33). From these spectra, it can be found that there is a slighter physisorption of CH 3 SH over F/T than other samples at 50 °C, , and CH 3 SH can be oxidized into sulfate, carbonate, and carboxylate more easily on CNF/T with deep oxidation sites below 300 °C. ,− The absorbance of carboxylate species over CNF/T first rises and then descends obviously. This trend shows that carboxylate generating below 200 °C is the reactive intermediate during the oxidation of CH 3 SH to carbonate over CNF/T.…”

Section: Resultsmentioning

confidence: 92%

Selective Synergistic Catalytic Elimination of NO_x and CH₃SH via Engineering Deep Oxidation Sites against Toxic Byproducts Formation

Liu,

Hu,

Zhang

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

“…In contrast, significant amounts of S species were detected on both samples after the reaction, indicating that some sulfur-containing products were adsorbed on the catalyst surface. As shown in Figure 13 B, three peaks at 163.2, 167.9, and 169.2 eV corresponding to S 0 , SO 3 2− (S 4+ ), and SO 4 2− (S 6+ ), respectively [ 30 , 54 ], which all showed higher valence than S 2- from CH 3 SH, indicating the oxidation of S during the reaction. It is worth noting that the catalytic experiments in CH 3 SH were performed under a nitrogen atmosphere, so it can be concluded that the O in the S-O species was mainly derived from the O ads of MnO 2 .…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of α- and β-MnO2 on Methyl Mercaptan Decomposition: The Role of Oxygen Vacancies

Liu

et al. 2023

Nanomaterials

Self Cite

View full text Add to dashboard Cite

As a representative sulfur-containing volatile organic compounds (S-VOCs), CH3SH has attracted widespread attention due to its adverse environmental and health risks. The performance of Mn-based catalysts and the effect of their crystal structure on the CH3SH catalytic reaction have yet to be systematically investigated. In this paper, two different crystalline phases of tunneled MnO2 (α-MnO2 and β-MnO2) with the similar nanorod morphology were used to remove CH3SH, and their physicochemical properties were comprehensively studied using high-resolution transmission electron microscope (HRTEM) and electron paramagnetic resonance (EPR), H2-TPR, O2-TPD, Raman, and X-ray photoelectron spectroscopy (XPS) analysis. For the first time, we report that the specific reaction rate for α-MnO2 (0.029 mol g−1 h−1) was approximately 4.1 times higher than that of β-MnO2 (0.007 mol g−1 h−1). The as-synthesized α-MnO2 exhibited higher CH3SH catalytic activity towards CH3SH than that of β-MnO2, which can be ascribed to the additional oxygen vacancies, stronger surface oxygen migration ability, and better redox properties from α-MnO2. The oxygen vacancies on the catalyst surface provided the main active sites for the chemisorption of CH3SH, and the subsequent electron transfer led to the decomposition of CH3SH. The lattice oxygen on catalysts could be released during the reaction and thus participated in the further oxidation of sulfur-containing species. CH3SSCH3, S0, SO32−, and SO42− were identified as the main products of CH3SH conversion. This work offers a new understanding of the interface interaction mechanism between Mn-based catalysts and S-VOCs.

show abstract

Regulation of the reaction pathway to design the high sulfur/coke-tolerant Ce-based catalysts for decomposing sulfur-containing VOCs

Cited by 16 publications

References 77 publications

Expediting Toluene Combustion by Harmonizing the Ce–O Strength over Co-Doped CeZr Oxide Catalysts

Expediting Toluene Combustion by Harmonizing the Ce–O Strength over Co-Doped CeZr Oxide Catalysts

Selective Synergistic Catalytic Elimination of NO_x and CH₃SH via Engineering Deep Oxidation Sites against Toxic Byproducts Formation

Comparative Study of α- and β-MnO2 on Methyl Mercaptan Decomposition: The Role of Oxygen Vacancies

Contact Info

Product

Resources

About

Regulation of the reaction pathway to design the high sulfur/coke-tolerant Ce-based catalysts for decomposing sulfur-containing VOCs

Cited by 16 publications

References 77 publications

Expediting Toluene Combustion by Harmonizing the Ce–O Strength over Co-Doped CeZr Oxide Catalysts

Expediting Toluene Combustion by Harmonizing the Ce–O Strength over Co-Doped CeZr Oxide Catalysts

Selective Synergistic Catalytic Elimination of NOx and CH3SH via Engineering Deep Oxidation Sites against Toxic Byproducts Formation

Comparative Study of α- and β-MnO2 on Methyl Mercaptan Decomposition: The Role of Oxygen Vacancies

Contact Info

Product

Resources

About

Selective Synergistic Catalytic Elimination of NO_x and CH₃SH via Engineering Deep Oxidation Sites against Toxic Byproducts Formation