The positive effect of Ca2+ on cryptomelane-type octahedral molecular sieve (K-OMS-2) catalysts for chlorobenzene combustion

Chen, Jingkun; Wang, Wanglong; Zhai, Shuaiying; Sun, Ping; Wu, Zhongbiao

doi:10.1016/j.jcis.2020.04.071

Cited by 16 publications

(5 citation statements)

References 52 publications

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“…Existing studies have reported that Cl-containing byproducts obtained through the combustion process have high consistency. 60 For example, our previous studies had detected that intermediate products of chlorobenzene over different types of catalysts like γ-MnO 2 , 62 OMS-2, 27 and CuNbO x 48 made no difference, all of which included abundant of polychlorobenzene, poly(vinyl chloride), and polychloromethane (see Figure 5). 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 4B, can also be regarded as a new research approach.…”

Section: Methodsmentioning

confidence: 98%

“…As shown in Figure 2A, by doping CaO into OMS-2, the formed CaCO 3 will react with the adsorbed chlorine, inhibiting chlorine poisoning of the active phase MnO x . 27 Moreover, some studies have reported that changing the adsorption mode of CVOCs would inhibit the combination of chlorine with surface metallic oxides. The common adsorption geometry of chlorobenzene molecules on the catalyst surface is the C−Cl vertical adsorption on the acid site (π−Cl−double acid), leading to the formation of metal− Cl.…”

Section: Methodsmentioning

confidence: 99%

“…Compared with the enhancement of the C–H bond oxidation and dechlorination properties of the catalyst by separately adding fixed elements, the protection of the primary active phase from erosion using adsorbed chlorine has also attracted considerable attention. As shown in Figure A, by doping CaO into OMS-2, the formed CaCO 3 will react with the adsorbed chlorine, inhibiting chlorine poisoning of the active phase MnO x . Moreover, some studies have reported that changing the adsorption mode of CVOCs would inhibit the combination of chlorine with surface metallic oxides.…”

Section: Inadequacy Of Catalytic Combustion Methodsmentioning

confidence: 99%

Section: Inadequacy Of Catalytic Combustion Methodsmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Inadequacy Of Catalytic Combustion Methodsmentioning

confidence: 99%

Section: Inadequacy Of Catalytic Combustion Methodsmentioning

confidence: 99%

See 2 more Smart Citations

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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“…110-115 • C; meanwhile, the desorption peaks at ca. 200-550 • C were assigned to strong acid sites [171]. Interestingly, after Ce-doping, all the peaks shifted to higher temperatures, indicating a stronger acidic behavior [156].…”

Section: [Ce]-k-oms-2mentioning

confidence: 96%

Recent Manganese Oxide Octahedral Molecular Sieves (OMS–2) with Isomorphically Substituted Cationic Dopants and Their Catalytic Applications

Sabaté

Sabater

2021

Catalysts

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The present report describes the structural and physical–chemical variations of the potassium manganese oxide mineral, α–MnO2, which is a specific manganese octahedral molecular sieve (OMS) named cryptomelane (K–OMS–2), with different transition metal cations. We will describe some frequently used synthesis methods to obtain isomorphic substituted materials [M]–K–OMS–2 by replacing the original manganese cationic species in a controlled way. It is important to note that one of the main effects of doping is related to electronic environmental changes, as well as to an increase of oxygen species mobility, which is ultimately related to the creation of new vacancies. Given the interest and the importance of these materials, here, we collect the most recent advances in [M]–K–OMS–2 oxides (M = Ag, Ce, Mo, V, Nb, W, In, Zr and Ru) that have appeared in the literature during the last ten years, leaving aside other metal–doped [M]–K–OMS–2 oxides that have already been treated in previous reviews. Besides showing the most important structural and physic-chemical features of these oxides, we will highlight their applications in the field of degradation of pollutants, fine chemistry and electrocatalysis, and will suggest potential alternative applications.

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Plasma driven exsolution of Ca as the adjacent dechlorinated site in La0.8Ca0.2MnO3 perovskite: A highly mineralization chlorobenzene oxidation catalyst

Tao,

Qi,

et al. 2024

Applied Catalysis A: General

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The positive effect of Ca2+ on cryptomelane-type octahedral molecular sieve (K-OMS-2) catalysts for chlorobenzene combustion

Cited by 16 publications

References 52 publications

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

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

Recent Manganese Oxide Octahedral Molecular Sieves (OMS–2) with Isomorphically Substituted Cationic Dopants and Their Catalytic Applications

Plasma driven exsolution of Ca as the adjacent dechlorinated site in La0.8Ca0.2MnO3 perovskite: A highly mineralization chlorobenzene oxidation catalyst

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