Open AccessEnhanced formaldehyde-removal over modified cryptomelane catalysts
Author(s) -
Trong-Phu Tran,
Xuan-Phuc Ta-Thi,
K. T. Nguyen,
Duy-Nhan Tran,
ThuyDuong NguyenPhan,
Khanh-Nguyen Pham,
Gia-Han Nguyen,
Tuyet-Mai Tran-Thuy
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/947/1/012024
Subject(s) - cryptomelane , formaldehyde , catalysis , manganese , dopant , materials science , nuclear chemistry , manganese oxide , inorganic chemistry , mineralogy , chemistry , metallurgy , organic chemistry , doping , optoelectronics
M-OMS-2 materials (M = K + , Cu 2+ , Co 2+ ) were prepared by an uncomplicated reflux method, and the cryptomelane crystalline structure was confirmed by X-ray diffraction patterns. Element analysis recorded ~56 - ~59 wt.% of Mn in the three synthesized samples and ~2.8 wt.% loadings of dopants over Co-OMS-2 and Cu-OMS-2 materials. A titration method valued the average oxidation states of manganese at 3.60, 3.71 and 3.77 for K-OMS-2, Co-OMS-2 and Cu-OMS-2, respectively. In comparison with K-OMS-2, Co and Cu dopants depicted a significant enhancement catalytic activity in removal of formaldehyde at low (5%) and high (65 %) relative humidity (RH). Cu-OMS-2 showed the highest catalyst performance with ~90 % of formaldehyde conversion at 150 °C, 65% RH, whereas only ~40 % (for Co-OMS-2) and ~26 % (for K-OMS-2) of that were observed. The finding results promised a potential Cu-OMS-2 material for designed low-costly catalyst in formaldehyde removal at a wide range of RH.