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Title: A highly efficient catalyst of palygorskite-supported manganese oxide for formaldehyde oxidation at ambient and low temperature: Performance, mechanism and reaction kinetics

Journal Article · · Applied Surface Science
 [1];  [2];  [1];  [1];  [3];  [1];  [1];  [1];  [1]
  1. Hefei Univ. of Technology (China)
  2. Hefei Univ. of Technology (China); Univ. of Connecticut, Storrs, CT (United States)
  3. Univ. of Connecticut, Storrs, CT (United States)

A series of palygorskite-supported manganese oxide (MnOx/PG) catalysts were prepd. by a pptn. method using different manganese precursor. The as-prepared MnOx/PG catalysts were used to evaluate the catalytic oxidn. of HCHO and characterized by BET, XRD, TG, Raman spectroscopy, TEM, H2-TPR, XPS, and chemical titration. The results showed that the crystalline phase, distribution and Mn valence states of MnOx on the surface of PG depended on the precursors. Birnessite-type manganese oxide (δ-MnO2) formed and uniformly coated on the surface of PG when potassium permanganate (PP) was used as the precursor. The MnOx/PG-PP catalyst showed the best catalytic activity for HCHO removal at low temp. among these catalysts and achieved complete HCHO conversion at 150 °C. More importantly, the dynamic single-pass removal efficiency of MnOx/PG-PP catalyst for ppm-level HCHO oxidn. was as high as 95% under high GHSV (300 L/g·h) at ambient temp. MnOx/PG-PP catalyst also exhibited excellent cycling stability and long-term activity at low and ambient temp. The kinetic results of MnOx/PG-PP catalyst showed that the oxidn. of HCHO followed the Mars-van Krevelen mechanism. The possible reaction pathway of HCHO oxidn. was proposed based on in situ DRIFTS and TPSR studies. The large sp. surface area, highly distributed active component, a high proportion of Mn4+ species, and lattice oxygen content are responsible for the high catalytic activity of MnOx/PG-PP for oxidn. of formaldehyde. This work developed a natural mineral supported manganese oxide as an inexpensive and efficient catalyst for the purifn. of HCHO in industrial or indoor air environment.

Research Organization:
Univ. of Connecticut, Storrs, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
FG02-86ER13622; 41872040; 41772038; 41572028
OSTI ID:
1598238
Journal Information:
Applied Surface Science, Vol. 486, Issue C; ISSN 0169-4332
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (2)

Transient in‐situ DRIFTS Investigation of Catalytic Oxidation of Toluene over α‐, γ‐ and β‐MnO 2 journal December 2019
Attapulgite-anchored Pd complex catalyst: a highly active and reusable catalyst for C–C coupling reactions journal December 2019