Excellent low-temperature catalytic performance of nanosheet Co-Mn oxides for total benzene oxidation

Zhang, Xiaolan; Ye, Junhui; Yuan, Jing; Cai, Tonghui; Xiao, Bei; Liu, Zhe; Zhao, Kun; Ling, Yang; He, Dannong

doi:10.1016/j.apcata.2018.05.039

Cited by 101 publications

(27 citation statements)

References 51 publications

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“…All the above phenomena indicate that the crystal structures of the manganese oxides gradually become more intact, and the oxygen mobility and thus the reducibility of the catalyst decrease with the increase in the calcination temperature. Similar phenomena are observed in many transition metal oxide catalysts [15,35], in which these processes decrease the availability of the reactive oxygen species in the oxidation reactions. It is well known that the Mars-van-Krevelen mechanism is operational in the transition metal oxide catalysts during the oxidation reactions, which involves the process of releasing and replenishing lattice oxygen.…”

Section: Resultssupporting

confidence: 77%

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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: Resultssupporting

confidence: 77%

“…Recent investigations have shown that the transition metal oxide catalysts (Mn, Co and Cu, etc.) show an activity that is comparable with the noble metal catalysts [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. In particular, these catalysts often show better resistance to the chlorine poisoning [26].…”

Section: Introductionmentioning

confidence: 92%

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

et al. 2019

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“…Benzene, toluene, ethylbenzene, and xylenes (BTEX), which are environmentally detrimental VOCs but indispensable chemicals, can corrode skin and irritate the respiratory system, and even affect the nervous system with prolonged exposures [2]. Catalytic oxidation is a promising technology to completely oxidize gas-phase VOCs to carbon dioxide and water with less byproduct [3].…”

Section: Introductionmentioning

confidence: 99%

“…Several recent works have demonstrated that transitional mixed metal oxides catalysts have excellent VOCs removal performance because of the merit of increased synergistic effect [4][5][6][7]. Besides, surface area, reducibility and adsorbed oxygen species are playing a key role in the design and fabrication of highly efficient mixed metal oxides catalysts for total VOCs oxidation [3,6,8]. 2 of 15 Mixed metal oxides catalysts, derived from the calcination of layered double hydroxides (LDHs) precursors, have been widely studied for heterogeneous catalysis, like VOCs oxidation, for some advantages with high dispersion of active components and increased cooperative effect [7,[9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Wang

et al. 2019

Catalysts

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Rational design LDHs (layered double hydroxides) with 3D hierarchical hollow structures have generated widespread interest for catalytic oxidation due to the high complexity in shell architecture and composition. Herein, we reported a handy two-step method to construct a 3D hierarchical NiCo2O4/NiO nanocage. This synthetic strategy contains a partial in situ transformation of ZIF-67 (zeolitic imidazolate framework-67) into Co-NiLDH yolk-shelled structures following ethanol etching, and a structure-preserved transformation from Co-NiLDH@ZIF-67 to a biphase nanocage following calcination. CoNi-yh-T (varied reaction time and calcination temperature) nanocages were investigated systematically by Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), H2- temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD) and studied for toluene oxidation. The CoNi-6h-350 sample showed much higher activity with 90% toluene conversion (T90) at 229 °C at a high space velocity (SV = 60,000 mL g−1 h−1) than other catalysts (T90 >240 °C). Abundant surface high valence Co ions caused by the novel hierarchical nanostructures, together with adsorbed oxygen species and abundant medium-strength surface acid sites, played a key role for catalytic activities.

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“…Among all existing techniques, thermal catalytic oxidation has always been considered as one of the most promising as it can convert harmful VOCs into benign compounds (such as CO 2 and H 2 O) effectively. 3,4 At first, noble metals were used for their high catalytic activity, 5,6 but their huge costs and ease of becoming coked stimulated researchers to increasingly focus on single or mixed transition metal composite oxides such as manganese oxides (MnO x ), and Mn-cobalt (Mn-Co) and Mn-nickel (Mn-Ni) oxides owing to their low cost and good reducibility. 3,7,8 It is reported that the existence of electron deficiency in the lattice of NiO would result in the formation of active oxygen species (such as O − ), which could transform intermediates with low chemical activity into CO 2 and H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Guo

Zhi

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Benzene (C6H6) is a typical kind of volatile organic compound (VOC) which can exert great harm to both human health and the environment, and, thus, which needs to be eliminated before its emission. In this work, porous manganese–nickel (Mn‐Ni) composite oxide catalysts were synthesized through the oxalate route and applied to thermal catalytic oxidation of C6H6. By means of activity tests and relative physico‐chemical characterizations, the factors affecting the activity of those Mn‐Ni composite oxides were explored. RESULTS Nitrogen (N2)‐adsorption/desorption and X‐ray photoelectron spectroscopy (XPS) measurements indicated that the Brunauer–Elmett–Teller (BET) surface area and the content of surface‐adsorbed oxygen species were increased due to the addition of Ni into Mn oxide (MnOx). Meanwhile, the oxygen mobility and reducibility also were improved in the Mn‐Ni composite oxides. Accordingly, compared with MnOx, the Mn‐Ni catalysts showed higher activity for thermal catalytic oxidation of C6H6. Moreover, porous Mn‐Ni composite oxides with a Mn:Ni molar ratio of 4:1 (Mn4Ni1) displayed the best catalytic activity. Further investigation indicated that the excellent catalytic performance of Mn4Ni1 composite oxides could be ascribed mainly to the larger BET surface area and the richer content of surface‐adsorbed oxygen species, as well as stronger oxygen mobility and better reducibility compared with other Mn‐Ni catalysts. CONCLUSIONS The Mn4Ni1 composite oxides showed a lowest T90 value of 172 °C (C6H6 concentration 200 ppm, WHSV 60 000 mL g−1 h−1) among all of the obtained Mn‐Ni composite oxides. Moreover, it also exhibited favourable catalytic stability at 210 °C in the presence or absence of moisture. © 2019 Society of Chemical Industry

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Excellent low-temperature catalytic performance of nanosheet Co-Mn oxides for total benzene oxidation

Cited by 101 publications

References 51 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

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

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