Promoting Effect and Mechanism of Alkali Na on Pd/SBA‐15 for Room Temperature Formaldehyde Catalytic Oxidation

Xiang, N.; Hou, Yaqin; Han, Xiaojin; Li, Yulin; Guo, Yaoping; Liu, Yong-Jin; Huang, Zhanggen

doi:10.1002/cctc.201901039

Cited by 24 publications

(6 citation statements)

References 62 publications

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“…The ω(CH 2 ), ν(CH 2 ), and ν(C-O) of dioxymethylenes were reflected in bands located at 1061, 1014, and 809 cm −1 , respectively [74,75]. Following previous studies, it was documented that HCHO was first adsorbed on the sample surface by molecules and then fleetly oxidized into DOM by carbonyl electrophilic carbon combined with nucleophilic surface oxygen [76]. After 10 min, DOM bands were detected and increased with time, showing that the catalytic oxidation reaction of HCHO was still occurring.…”

Section: Intermediates and Mechanismmentioning

confidence: 74%

“…After 10 min, DOM bands were detected and increased with time, showing that the catalytic oxidation reaction of HCHO was still occurring. The paraformaldehyde (POM) produced by the adsorption corresponding to the peak value of 937 cm −1 was also rapidly accumulating and continuously generating DOM [75,76]. The amount of DOM reached a stable value as the production of DOM, and its further conversion attained a dynamic equilibrium at 40 min.…”

Section: Intermediates and Mechanismmentioning

confidence: 99%

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Excellent Performance and Feasible Mechanism of ErOx-Boosted MnOx-Modified Biochars Derived from Sewage Sludge and Rice Straw for Formaldehyde Elimination: In Situ DRIFTS and DFT

Wang,

Gao,

Xie

et al. 2023

Catalysts

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To avoid resource waste and environmental pollution, a chain of ErOx-boosted MnOx-modified biochars derived from rice straw and sewage sludge (EryMn1-y/BACs, where biochars derived from rice straw and sewage sludge were defined as BACs) were manufactured for formaldehyde (HCHO) elimination. The optimal 15%Er0.5Mn0.5/BAC achieved a 97.2% HCHO removal efficiency at 220 °C and exhibited favorable EHCHO and thermal stability in a wide temperature window between 180 and 380 °C. The curbed influences of H2O and SO2 offset the boosting effect of O2 in a certain range. Er–Mn bimetallic-modified BACs offered a superior HCHO removal performance compared with that of BACs boosted using Er or Mn separately, owing to the synergistic effect of ErOx and MnOx conducive to improving the samples’ total pore volume and surface area, surface active oxygen species, promoting redox ability, and inhibiting the crystallization of MnOx. Moreover, the support’s hierarchical porous structure not only expedited the diffusion and mass transfer of reactants and their products but also elevated the approachability of adsorption and catalytic sites. Notably, these prominent features were partly responsible for the outstanding performance and excellent tolerance to H2O and SO2. Using in situ DRIFTS characterization analysis, it could be inferred that the removal process of HCHO was HCHOad → dioxymethylene (DOM) → formate species → CO2 + H2O, further enhanced with reactive oxygen species. The DFT calculation once again proved the removal process of HCHO and the strengthening effect of Er doping. Furthermore, the optimal catalytic performance of 15%Er0.5Mn0.5/BAC demonstrated its vast potential for practical applications.

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Section: Intermediates and Mechanismmentioning

confidence: 74%

Section: Intermediates and Mechanismmentioning

confidence: 99%

Excellent Performance and Feasible Mechanism of ErOx-Boosted MnOx-Modified Biochars Derived from Sewage Sludge and Rice Straw for Formaldehyde Elimination: In Situ DRIFTS and DFT

Wang,

Gao,

Xie

et al. 2023

Catalysts

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“…When the Na/Ru molar ratios rose from 5 to 10, the conversion of DINP improved about 10%, and the selectivity of DINCH raised about 20%. However, at the Na/Ru molar ratios of 15, the conversion of DINP and the selectivity of DINCH declined significantly which was attributed to the presence of excess sodium ions covering the active sites on the catalyst surface; hence, the presence of a moderate amount of alkali metals facilitated the hydrogenation reaction . The Ru Na + /γ-Al 2 O 3 with the Na/Ru molar ratios of 10 was effective catalyst for the hydrogenation of DINP to DINCH.…”

Section: Resultsmentioning

confidence: 99%

Ultrauniform Ru Nanoclusters as Efficient Hydrogenation Catalysts for Phthalates

Sun

et al. 2023

Ind. Eng. Chem. Res.

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Cyclohexane dicarboxylic acid (CHDA) ester, a kind of environmental-friendly plasticizer, can be produced by phthalates hydrogenation. However, the synthesis of catalysts with high activity and selectivity is a challenge due to the stability of aromatic rings. In this work, a series of ultrauniform Ru nanoclusters supported by γ-Al2O3 are synthesized for the hydrogenation of diisononyl phthalate (DINP). Results show that the conversion of DINP and the selectivity of diisononyl-cyclohexane-1,2-dicarboxylate (DINCH) both reach 100% at 140 °C and 3 MPa H2 pressure. Diisononyl-cyclohexene-1,2-dicarboxylate (4H-DINP) and 1,2-cyclohexanedicarboxylate-7-methyloctyl ester are found; the hydrogenation reaction network of DINP is constructed. Alkali metal ions adsorbed on the surface of Ru nanoclusters prepared by the polyol method can stabilize Ru3+-Hδ− species by electrostatic interaction, thus affecting the hydrogenation activity of the catalyst, following the order of Li+ > Na+ > K+ > Cs+. Ru-based catalysts prepared by the polyol method have good prospects for application in phthalates hydrogenation.

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“…Although precious-metal-based catalysts (Pt/TiO 2 , Pd/CeO 2 , Au/FeO x , Ir/Al 2 O 3 , etc.) manifested exceptional HCHO oxidation performance [21][22][23][24][25][26][27], the scarce terrestrial abundance and exorbitant prices of precious metals seriously restrict their largescale application [28][29][30]. Therefore, abundant and low-cost transition-metal oxides have aroused increasing interest.…”

Section: Introductionmentioning

confidence: 99%

ZIF-67 Derived Cu-Co Mixed Oxides for Efficient Catalytic Oxidation of Formaldehyde at Low-Temperature

et al. 2023

Self Cite

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It is still an intractable problem to exploit high-efficient Co-based catalysts for low-temperature HCHO oxidation. Herein, we synthesized a series of Cu-doped Co3O4 catalysts (Cu1Co8, Cu1Co4, and Cu1Co2 corresponded to 1/8, 1/4, and 1/2 of Cu/Co molar ratios, respectively) via in situ pyrolysis of bimetal Cu-ZIF-67 precursors and the pure Co3O4 sample was also prepared through directly annealing monometal ZIF-67 for comparison. Performance tests of HCHO oxidation found that Cu doping remarkably enhanced the low-temperature HCHO oxidation performance of Co3O4 sample, and thereinto the Cu1Co4 possessed the optimal HCHO oxidation activity, which achieved 90% HCHO conversion at 108 °C. The characterization results revealed that the stronger interaction between Cu and Co species (Co2+ + Cu2+ ↔ Co3+ + Cu+) of Cu1Co4 not only facilitates the formation of defect sites, Co3+ and surface adsorbed oxygen species but also improves its low-temperature reducibility, and consequently resulting in its superior HCHO oxidation performance. Furthermore, the in-situ DRIFTS results suggested that the formaldehyde oxidation over Cu1Co4 followed HCHO → H2CO2 → HCOO− → CO32− → CO2 pathway. The present work provides a novel and facile approach to fabricating highly effective Co-based catalysts for low-temperature HCHO oxidation.

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Promoting Effect and Mechanism of Alkali Na on Pd/SBA‐15 for Room Temperature Formaldehyde Catalytic Oxidation

Cited by 24 publications

References 62 publications

Excellent Performance and Feasible Mechanism of ErOx-Boosted MnOx-Modified Biochars Derived from Sewage Sludge and Rice Straw for Formaldehyde Elimination: In Situ DRIFTS and DFT

Excellent Performance and Feasible Mechanism of ErOx-Boosted MnOx-Modified Biochars Derived from Sewage Sludge and Rice Straw for Formaldehyde Elimination: In Situ DRIFTS and DFT

Ultrauniform Ru Nanoclusters as Efficient Hydrogenation Catalysts for Phthalates

ZIF-67 Derived Cu-Co Mixed Oxides for Efficient Catalytic Oxidation of Formaldehyde at Low-Temperature

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