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Structural Dependence of Competitive Adsorption of Water and Methanol on TiO 2 Surfaces
Author(s) -
Wang Zhengming,
Xiong Feng,
Sun Guanghui,
Jin Yuekang,
Huang Weixin
Publication year - 2017
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201600738
Subject(s) - chemisorption , chemistry , anatase , rutile , adsorption , methanol , x ray photoelectron spectroscopy , desorption , inorganic chemistry , chemical engineering , photocatalysis , catalysis , organic chemistry , engineering
Employing TiO 2 anatase (001)‐(1 × 4), rutile (110) and rutile (011)‐(2 × 1) single crystal surfaces, we comprehensively studied the effects of TiO 2 surface structures on the competitive adsorption of water and methanol by means of low energy electron diffraction, thermal desorption spectra and X‐ray photoelectron spectroscopy. The relative adsorption strengths of chemisorbed methanol and water vary with the TiO 2 surface structures and the adsorption sites. This leads to TiO 2 surface structure‐dependent competitive adsorption of water and methanol. The chemisorption of CH 3 OH on TiO 2 anatase (001)‐(1 × 4) surface is seldom affected by pre‐covered water at low coverages but is affected by pre‐covered water at high coverages; the chemisorption of CH 3 OH on TiO 2 rutile (110) surface is seldom affected by pre‐covered water; and the chemisorption of CH 3 OH on TiO 2 rutile (011)‐(2 × 1) surface is affected by pre‐covered water even at low coverages. These results deepen the fundamental understandings of surface chemistry on TiO 2 surfaces.