Promotional catalytic oxidation of airborne Formaldehyde over mineral-supported MnO2 at ambient temperature

Wang, Can; Chen, Tianhu; Liu, Haibo; Xie, Jingjing; Li, Mengxue; Han, Zhengyan; Zhao, Yi; He, Haiying; Zou, Xuehua; Suib, Steven L.

doi:10.1016/j.clay.2019.105289

Title: Promotional catalytic oxidation of airborne Formaldehyde over mineral-supported MnO₂ at ambient temperature

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Abstract

Achieving low-level formaldehyde (HCHO) catalytic oxidation at ambient temperature under a high gas-hourly space velocity (GHSV) remains challenging. In this study, MnO₂-based catalysts were prepared via a facile in-situ redox reaction using palygorskite (Pg), montmorillonite (MT) and diatomite (DT) as support materials. The results indicated that these minerals substantially enhanced the performance of HCHO oxidn. compared with that of commercial Al₂O₃ at ambient temp. The as-prepared MnO₂/PG exhibited the superior catalytic performance, where 100% removal efficiency of 1 ppm HCHO in 1500 min remained under a GHSV of 150,000 h^-1. The performance order of the as-prepared catalysts at 1500 min was MnO₂/PG (100%) > MnO₂/MT (87%) > MnO₂/DT (74%) > MnO₂/Al₂O₃ (59%). More importantly, the MnO₂/PG catalyst exhibited the highest CO₂ selectivity (72.1%) and excellent long-term stability after five cycles. The kinetic results for HCHO oxidn. followed the second-order kinetics. The well-distributed MnO₂, abundant hydroxyl species, and Mn3+ and Mn4+ couples were responsible for the excellent catalytic performance of MnO₂/PG. In addn., the incorporation of MnO₂ with PG increased the electron d. of the MnO₂/PG surface, which was also related to the excellent performance for HCHO oxidn. A possible reaction mechanism for HCHO oxidn. was proposed based on XPS, in-situmore »« less

Authors:

Wang, Can ^[1]; Chen, Tianhu ^[1];

^[1]; Xie, Jingjing ^[1]; Li, Mengxue ^[1]; Han, Zhengyan ^[1]; Zhao, Yi ^[1];

^[2]; Zou, Xuehua ^[3]; Suib, Steven L. ^[4]

Hefei Univ. of Technology (China)
Foshan Univ. (China)
Hefei Univ. of Technology (China); Univ. of Connecticut, Storrs, CT (United States)
Univ. of Connecticut, Storrs, CT (United States)

Publication Date:: Fri Sep 06 00:00:00 EDT 2019

Research Org.:: Univ. of Connecticut, Storrs, CT (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Natural Science Foundation of China (NSFC); Engineering Research Center of Non-metallic Minerals of Zhejiang Province; Key Laboratory of Clay Minerals, Ministry of Land and Resources

OSTI Identifier:: 1598216

Grant/Contract Number:: FG02-86ER13622

Resource Type:: Accepted Manuscript

Journal Name:: Applied Clay Science

Additional Journal Information:: Journal Volume: 182; Journal Issue: C; Journal ID: ISSN 0169-1317

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Catalytic oxidation; Formaldehyde; Manganese oxide; Mineral supports; Ambient temperature

Citation Formats


                    Wang, Can, Chen, Tianhu, Liu, Haibo, Xie, Jingjing, Li, Mengxue, Han, Zhengyan, Zhao, Yi, He, Haiying, Zou, Xuehua, and Suib, Steven L. Promotional catalytic oxidation of airborne Formaldehyde over mineral-supported MnO2 at ambient temperature.  United States: N. p., 2019. 
Web.  doi:10.1016/j.clay.2019.105289.

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                    Wang, Can, Chen, Tianhu, Liu, Haibo, Xie, Jingjing, Li, Mengxue, Han, Zhengyan, Zhao, Yi, He, Haiying, Zou, Xuehua, & Suib, Steven L. Promotional catalytic oxidation of airborne Formaldehyde over mineral-supported MnO2 at ambient temperature.  United States.  https://doi.org/10.1016/j.clay.2019.105289

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                    Wang, Can, Chen, Tianhu, Liu, Haibo, Xie, Jingjing, Li, Mengxue, Han, Zhengyan, Zhao, Yi, He, Haiying, Zou, Xuehua, and Suib, Steven L. Fri .  
"Promotional catalytic oxidation of airborne Formaldehyde over mineral-supported MnO2 at ambient temperature".  United States.  https://doi.org/10.1016/j.clay.2019.105289.  https://www.osti.gov/servlets/purl/1598216.

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@article{osti_1598216,

  title        = {Promotional catalytic oxidation of airborne Formaldehyde over mineral-supported MnO2 at ambient temperature},

  author       = {Wang, Can and Chen, Tianhu and Liu, Haibo and Xie, Jingjing and Li, Mengxue and Han, Zhengyan and Zhao, Yi and He, Haiying and Zou, Xuehua and Suib, Steven L.},

  abstractNote = {Achieving low-level formaldehyde (HCHO) catalytic oxidation at ambient temperature under a high gas-hourly space velocity (GHSV) remains challenging. In this study, MnO2-based catalysts were prepared via a facile in-situ redox reaction using palygorskite (Pg), montmorillonite (MT) and diatomite (DT) as support materials. The results indicated that these minerals substantially enhanced the performance of HCHO oxidn. compared with that of commercial Al2O3 at ambient temp. The as-prepared MnO2/PG exhibited the superior catalytic performance, where 100% removal efficiency of 1 ppm HCHO in 1500 min remained under a GHSV of 150,000 h-1. The performance order of the as-prepared catalysts at 1500 min was MnO2/PG (100%) > MnO2/MT (87%) > MnO2/DT (74%) > MnO2/Al2O3 (59%). More importantly, the MnO2/PG catalyst exhibited the highest CO2 selectivity (72.1%) and excellent long-term stability after five cycles. The kinetic results for HCHO oxidn. followed the second-order kinetics. The well-distributed MnO2, abundant hydroxyl species, and Mn3+ and Mn4+ couples were responsible for the excellent catalytic performance of MnO2/PG. In addn., the incorporation of MnO2 with PG increased the electron d. of the MnO2/PG surface, which was also related to the excellent performance for HCHO oxidn. A possible reaction mechanism for HCHO oxidn. was proposed based on XPS, in-situ DRIFTS and electrochem. analyses. We conclude this study paves a road for the development of MnO2/mineral hybrid catalysts for indoor air purifn. at ambient temp.},

  doi          = {10.1016/j.clay.2019.105289},

  journal      = {Applied Clay Science},

  number       = C,

  volume       = 182,

  place        = {United States},

  year         = {Fri Sep 06 00:00:00 EDT 2019},

  month        = {Fri Sep 06 00:00:00 EDT 2019}

}

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Title: Promotional catalytic oxidation of airborne Formaldehyde over mineral-supported MnO2 at ambient temperature

Abstract

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Title: Promotional catalytic oxidation of airborne Formaldehyde over mineral-supported MnO₂ at ambient temperature