SnO –MnO –TiO2 catalysts with high resistance to chlorine poisoning for low-temperature chlorobenzene oxidation

Li, Jingwei; Zhao, Pei; Liu, Shantang

doi:10.1016/j.apcata.2014.06.013

Cited by 63 publications

(24 citation statements)

References 39 publications

(31 reference statements)

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“…This decrease may be related to the effects of the chlorine poisoning. During the catalytic oxidation of the CVOCs, the catalyst is inevitably chlorinated, even causing changes in the specific surface area or the crystal structure of the catalyst [47]. Hence, we speculated that the catalyst channel was blocked by the newly formed structure in the 1,2-DCE oxidation process.…”

Section: Resultsmentioning

confidence: 99%

Structure-Activity Relationship of Manganese Oxide Catalysts for the Catalytic Oxidation of (chloro)-VOCs

et al. 2019

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Manganese oxide catalysts, including γ-MnO2, Mn2O3 and Mn3O4, were synthesized by a precipitation method using different precipitants and calcination temperatures. The catalytic oxidations of benzene and 1,2-dichloroethane (1,2-DCE) were then carried out. The effects of the calcination temperature on the catalyst morphology and activity were investigated. It was found that the specific surface area and reducibility of the catalysts decreased with the increase in the calcination temperature, and both the γ-MnO2 and Mn3O4 were converted to Mn2O3. These catalysts showed good activity and selectivity for the benzene and 1,2-DCE oxidation. The γ-MnO2 exhibited the highest activity, followed by the Mn2O3 and Mn3O4. The high activity could be associated with the large specific surface area, abundant surface oxygen species and excellent low-temperature reducibility. Additionally, the catalysts were inevitably chlorinated during the 1,2-DCE oxidation, and a decrease in the catalytic activity was observed. It suggested that a higher reaction temperature could facilitate the removal of the chlorine species. However, the reduction of the catalytic reaction interface was irreversible.

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Section: Resultsmentioning

confidence: 99%

Structure-Activity Relationship of Manganese Oxide Catalysts for the Catalytic Oxidation of (chloro)-VOCs

et al. 2019

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“…According to the synergetic effect on the interactions of metal oxides-metal oxides or metal oxidessupport, composite or mixed metal oxides can enhance the surface acidic sites and significantly promote the mobility of the active oxygen on the surface of catalysts [21] . Studies found composite oxides [1,24,25] , such as perovskite-type and spinel, and mixed oxides, for example, MnOx/CeO2 [26,27] , VOx/CeO2 [28] , SnOx-MnOx-TiO2 [29] , CeO2/TiO2 [30] , Cr/TiO2 [31] , and others [32] , can be replaced by transition metal oxides, according to the lowering of cost, high oxidation activity and thermal stability for CVOCs degradation. According to reports, CeO2 show a high performance in eliminating CVOCs due to the significant effect in breaking the C-Cl bond [33,34] .…”

Section: Introductionmentioning

confidence: 99%

“…As the third catalysts of transition metal oxides have received more attention owing to the high activity and good tolerance to Cl poisoning [29,35] . In these transition metal oxides, ceria-based oxides, like CeO2-TiO2 [6] , CeO2-FeOx [5] , CeO2-CrOx [33,36] , CeO2-VOx [28,37] , CeO2-WOx [3] , and CeO2-MnOx [14,26,38] , have attracted more attention due to the high oxygen storage capacity, Ce 4+ /Ce 3+ redox properties of cerium oxide, and the strong interplay between MOx and CeO2.…”

Section: Introductionmentioning

confidence: 99%

Improved Activity and Stability of Chlorobenzene Oxidation Over Transition Metal-Substituted Spinel-Type Catalysts Supported on Cordierite

Huang

Zhang

et al. 2021

Catal Lett

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Industrial catalysts usually encounter great challenges in Cl• deactivation, toxic by-products generation, and stability with a long running operation for catalytic oxidation of chlorinated volatile organic compounds (CVOCs). In this research, spinel-type oxides with transition metal substituted as active oxides supported on cordierite (Crd) was identified to catalytic degradation of chlorobenzene (CB). The Cu1.4Mn1.6O4 spinel-type oxides considered as the main active oxides have been identified, which were confirmed by XRD and TEM. The activities of these CuMxMn2-xO4 catalysts were markedly improved by lower calcining temperature and shorter time. CuCe0.25Mn1.75O4/Crd catalyst displayed the highest activity and good stability due to that CeO2 nano-rods structure conducive to increase the Oads amount, the dispersion of active oxides, the strength of weak acidity, the surface areas and pore volume. Moreover, spinel-type with CeO2 doping exhibited high performance in CVOCs elimination attributed to the high storage capacity of oxygen, plentiful oxygen vacancies, good efficiency in breaking C-Cl bond and the easy shuttles between Ce 3+ and Ce 4+ , which were demonstrated by XPS. The results indicate that CeO2, Oads, and •OH have beneficial effects on the removing Cl• into benzene, and then improving the ring-opening of CB for CB degradation.

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“…However, the influence of Mn doping on the catalytic performance of CeO 2 -ZrO 2 catalysts has seldom been systematically studied, especially for the elimination of CVOCs. Herein, Mn-Ce-Zr-O catalysts doped with a varying Mn content were synthesized and used for the elimination of CB, which is a typical CVOCs model widely used in the evaluation of catalysts [31,32]. The physicochemical properties of the prepared catalysts were systematically assessed by various material characterization techniques.…”

Section: Introductionmentioning

confidence: 99%

High Catalytic Performance of Mn-Doped Ce-Zr Catalysts for Chlorobenzene Elimination

Zhu

Liu

et al. 2019

Nanomaterials

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Mn-Ce-Zr-O catalysts doped with varying Mn content were prepared and assessed for the catalytic combustion of chlorobenzene (CB). Nanosized MCZ-0.67 catalyst with amorphous phase exhibited a high and stable catalytic activity among the studied catalysts, achieving 90% CB conversion at 226 °C and withstanding stability tests, including time-based stability and the successive influence of various operating conditions. Meanwhile, the MCZ-0.67 catalyst used showed good recyclability by calcination in air. Characterization results suggested that Mn doping played a dominant role in improving the catalytic performance, resulting in larger surface area, better redox properties and greater amounts of surface active oxygen. In addition, the introduction of Zr was also indispensable for maintaining the good catalytic performance of catalysts. Finally, trace amounts of polychlorinated by-products during CB oxidation were monitored and the oxidation process was discussed.

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SnO –MnO –TiO2 catalysts with high resistance to chlorine poisoning for low-temperature chlorobenzene oxidation

Cited by 63 publications

References 39 publications

Structure-Activity Relationship of Manganese Oxide Catalysts for the Catalytic Oxidation of (chloro)-VOCs

Structure-Activity Relationship of Manganese Oxide Catalysts for the Catalytic Oxidation of (chloro)-VOCs

Improved Activity and Stability of Chlorobenzene Oxidation Over Transition Metal-Substituted Spinel-Type Catalysts Supported on Cordierite

High Catalytic Performance of Mn-Doped Ce-Zr Catalysts for Chlorobenzene Elimination

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