Deactivation effects of Pb(II) and sulfur dioxide on a γ-MnO2 catalyst for combustion of chlorobenzene

Sun, Ping; Long, Yu; Long, Yunpeng; Cao, Shuang; Weng, Xiaole; Wu, Zhongbiao

doi:10.1016/j.jcis.2019.09.059

Cited by 38 publications

(12 citation statements)

References 62 publications

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“…introduced Pb with a surface molar ratio of 0.2% over CeO 2 –WO 3 /TiO 2 –SiO 2 catalyst for NO reduction, which exhibited lower efficiency and poorer H 2 O/SO 2 tolerance . The effects of Ca and Pb on catalytic oxidation of chlorobenzene and 1,2-dichlorobenzene were also investigated. , The additional poisons suppressed the original oxygen mobility of the catalysts, leading to the generation of more byproducts during the reaction. These metals might also interact with SO 2 to generate metallic sulfates bonding with active sites on the catalyst surface, causing further deep and combined deactivation. , Besides, the adhesion, plugging, and pipeline corrosion also exist due to these sulfates.…”

Section: Introductionmentioning

confidence: 99%

“…27,28 17 The effects of Ca and Pb on catalytic oxidation of chlorobenzene and 1,2-dichlorobenzene were also investigated. 30,31 The additional poisons suppressed the original oxygen mobility of the catalysts, leading to the generation of more byproducts during the reaction. These metals might also interact with SO 2 to generate metallic sulfates bonding with active sites on the catalyst surface, causing further deep and combined deactivation.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Flexibility for Catalytic Ozonation of Dichloromethane over Urchin-Like CuMnO_x in Flue Gas with Complicated Components

Lin

Cai

et al. 2022

Environ. Sci. Technol.

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The evaluation of the poisoning effect of complex components in practical gas on DCM (dichloromethane) catalytic ozonation is of great significance for enhancing the technique’s environmental flexibility. Herein, Ca, Pb, As, and NO/SO2 were selected as a typical alkaline-earth metal, heavy metal, metalloid, and acid gas, respectively, to evaluate their interferences on catalytic behaviors and surface properties of an optimized urchin-like CuMn catalyst. Ca/Pb loading weakens the formation of oxygen vacancies, oxygen mobility, and acidity due to the fusion of Mn–Ca/Pb–O, leading to their inferior catalytic performance with poor CO2 selectivity and mineralization rate. Noticeably, the presence of As induces excessively strong acidity, facilitating the inevitable formation of byproducts. Catalytic co-ozonation of NO/DCM is achieved with stoichiometric ozone addition. Unfortunately, SO2 introduction brings irreversible deactivation due to strong competition adsorption and the loss of active sites. Unexpectedly, Ca loading protects active sites from an attack by SO2. The formation of unstable sulfites and the released Mn–O structure offset the negative effect from SO2. Overall, the catalytic ozonation of DCM exhibits a distinctive priority in the antipoisoning of metals with the maintenance of DCM conversion. The construction of more stable acid sites should be the future direction of catalyst design; otherwise, catalytic ozonation should be arranged together with post heavy metal capture and a deacidification system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of the Flexibility for Catalytic Ozonation of Dichloromethane over Urchin-Like CuMnO_x in Flue Gas with Complicated Components

Lin

Cai

et al. 2022

Environ. Sci. Technol.

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“…The acidic properties of varied {001}-TiO 2 -based catalysts were also evaluated using the Fourier transform infrared spectra of pyridine adsorption (Py-FT-IR) (Figure c). Two weak bands at 1545 and 1640 cm –1 corresponded to Brønsted acidic sites, which mainly originated from surface bridging hydroxyl (Ti-O(H)-Ti). ,, Two intense bands at 1444 and 1604 cm –1 were ascribed to Lewis acidic sites, deriving from the cationic Ti and noble metal species. , The significantly higher Lewis acid sites of NaBH 4 -{001}-TiO 2 than {001}-TiO 2 and Ru/{001}-TiO 2 -without NaBH 4 implied that the NaBH 4 reductive impregnation method was an effective means to increase Lewis acid sites. As reported, CB was likely to adsorb and dissociate on the acidic surface of TiO 2 following the attack by basic nucleophilic oxygen (O 2– ) or the hydroxyl group to form phenolate .…”

Section: Resultsmentioning

confidence: 99%

Insights into Chlorobenzene Catalytic Oxidation over Noble Metal Loading {001}-TiO₂: The Role of NaBH₄ and Subnanometer Ru Undergoing Stable Ru⁰↔Ru⁴⁺ Circulation

Sun

et al. 2022

Environ. Sci. Technol.

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Catalytic combustion of ubiquitous chlorinated volatile organic compounds (CVOCs) encounters bottlenecks regarding catalyst deactivation by chlorine poisoning and generation of toxic polychlorinated byproducts. Herein, Ru, Pd, and Rh were loaded on {001}-TiO2 for thermal catalytic oxidation of chlorobenzene (CB), with Ru/{001}-TiO2 representing superior reactivity, CO2 selectivity, and stability in the 1000 min on-stream test. Interestingly, both acid sites and reactive active oxygen species (ROS) were remarkably promoted via adding NaBH4. But merely enhancing these active sites of the catalyst in CVOC treatment is insufficient. Continuous deep oxidation of CB with effective Cl desorption is also a core issue successfully tackled through the steady Ru0↔Ru4+ circulation. This circulation was facilitated by the observed higher subnanometer Ru dispersion on {001}-TiO2 than the other two noble metals that was supported by single atom stability DFT calculation. Nearly 88 degradation products in off-gas were detected, with Ru/{001}-TiO2 producing the lowest polychlorinated benzene byproducts. An effective and sustainable CB degradation mechanism boosted by the cooperation of NaBH4 enhanced active sites and Ru circulation was proposed accordingly. Insights gained from this study open a new avenue to the rational design of promising catalysts for the treatment of CVOCs.

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“…Existing studies have reported that Cl-containing byproducts obtained through the combustion process have high consistency . For example, our previous studies had detected that intermediate products of chlorobenzene over different types of catalysts like γ-MnO 2 , OMS-2, and CuNbO x made no difference, all of which included abundant of polychlorobenzene, poly(vinyl chloride), and polychloromethane (see Figure ). By using selected adsorbents for collecting these polychlorobenzene and poly(vinyl chloride) with subsequent hydroxylation and dechlorination, for example, like the “nCa” catalyst exhibited in Figure B, can also be regarded as a new research approach.…”

Section: Possible Combination Of Dechlorination Methodsmentioning

confidence: 93%

Industrial Chlorinated Organic Removal with Elimination of Secondary Pollution: A Perspective

Sun

Cheng

Gao³

et al. 2023

J. Phys. Chem. C

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Chlorinated volatile organic compounds (CVOCs) emitted from the industrial fabrication process and coatings, pharmacy, and incineration are toxic to the environment and humans. Catalytic combustion can convert CVOCs into CO 2 , H 2 O, and HCl/Cl 2 at lower temperatures; as such, it is regarded as a promising method at present. However, it still causes serious secondary pollutants because of the involved toxic polychlorinated byproducts that are discharged in the tail gas or deposited on the catalyst surface or reaction device. This is because the individual combustion process cannot completely remove the dissociated chlorine to form HCl; therefore, it can react again with the catalyst or byproducts, resulting in the deactivation of the catalyst and the formation and accumulation of polychlorinated byproducts, including dioxin. The industrial catalytic hydro-dechlorination (HDC) process is more concerned with formation of HCl and acquisition of desired products, which is expected to achieve a possible result of complete elimination of industrial CVOC gas without secondary byproduct pollution via combination of the combustion process and HDC process. Herein, we highlight the reaction characteristics of combustion and HDC methods against CVOCs and provide a perspective on the need for accomplishing the elimination and recycling of industrial CVOCs in the design of possible combined processing methods.

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Deactivation effects of Pb(II) and sulfur dioxide on a γ-MnO2 catalyst for combustion of chlorobenzene

Cited by 38 publications

References 62 publications

Evaluation of the Flexibility for Catalytic Ozonation of Dichloromethane over Urchin-Like CuMnO_x in Flue Gas with Complicated Components

Evaluation of the Flexibility for Catalytic Ozonation of Dichloromethane over Urchin-Like CuMnO_x in Flue Gas with Complicated Components

Insights into Chlorobenzene Catalytic Oxidation over Noble Metal Loading {001}-TiO₂: The Role of NaBH₄ and Subnanometer Ru Undergoing Stable Ru⁰↔Ru⁴⁺ Circulation

Industrial Chlorinated Organic Removal with Elimination of Secondary Pollution: A Perspective

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Deactivation effects of Pb(II) and sulfur dioxide on a γ-MnO2 catalyst for combustion of chlorobenzene

Cited by 38 publications

References 62 publications

Evaluation of the Flexibility for Catalytic Ozonation of Dichloromethane over Urchin-Like CuMnOx in Flue Gas with Complicated Components

Evaluation of the Flexibility for Catalytic Ozonation of Dichloromethane over Urchin-Like CuMnOx in Flue Gas with Complicated Components

Insights into Chlorobenzene Catalytic Oxidation over Noble Metal Loading {001}-TiO2: The Role of NaBH4 and Subnanometer Ru Undergoing Stable Ru0↔Ru4+ Circulation

Industrial Chlorinated Organic Removal with Elimination of Secondary Pollution: A Perspective

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Evaluation of the Flexibility for Catalytic Ozonation of Dichloromethane over Urchin-Like CuMnO_x in Flue Gas with Complicated Components

Evaluation of the Flexibility for Catalytic Ozonation of Dichloromethane over Urchin-Like CuMnO_x in Flue Gas with Complicated Components

Insights into Chlorobenzene Catalytic Oxidation over Noble Metal Loading {001}-TiO₂: The Role of NaBH₄ and Subnanometer Ru Undergoing Stable Ru⁰↔Ru⁴⁺ Circulation