Open AccessA nanorod-like KTi8O16 catalyst for soot combustion
Author(s) -
Qian Li,
Yanan Lv,
Yuebin Li,
Nana Zhang,
Jun Zhang,
Zhaoliang Zhang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/680/1/012067
Subject(s) - nanorod , soot , cryptomelane , catalysis , materials science , x ray absorption fine structure , anatase , chemical engineering , combustion , high resolution transmission electron microscopy , transmission electron microscopy , nanotechnology , chemistry , organic chemistry , photocatalysis , engineering , manganese oxide , physics , quantum mechanics , spectroscopy
A nanorod-like KTi 8 O 16 catalyst was successfully prepared by combustion method and applied for removing hazardous diesel soot. The cryptomelane structure of KTi 8 O 16 is confirmed by X-ray powder diffraction (XRD). The straight and smooth crystalline nanorods with the diameter of 180 nm are identified by transmission electron microscopy (TEM) and (200) facet is observed to be preferentially exposed. K cations are not freely present in cryptomelane structure of KTi 8 O 16 derived from X-ray absorption fine-structure (XAFS) results, possibly due to the confinement or interaction of K with Ti element. By temperature-programmed oxidation (TPO) experiments, its catalytic soot combustion performance was evaluated, with T 10 and T m of 435°C and 511°C, which are decreased by 19°C and 45°C respectively compared with pure anatase TiO 2 . K + species are deduced to serve as the active sites in the catalytic soot oxidation reaction, which are confined in the channels of the nanorod-like KTi 8 O 16 .