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论文类型：期刊论文

发表时间：2013-07-17

发表刊物：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录刊物：SCIE、EI、Scopus

卷号：135

期号：28

页面范围：10206-10209

ISSN号：0002-7863

摘要：It is well established that adding methanol to water could significantly enhance H-2 production by TiO2. Recently, we have found that methanol can be photocatalytically dissociated on TiO2(110) at 400 nm via a stepwise mechanism. However, how molecular hydrogen can be formed from the photocatalyzed methanol/TiO2(110) surface is still not clear. In this work, we have investigated deuterium formation from photocatalysis of the fully deuterated methanol (CD3OD) on TiO2(110) at 400 nm using a temperature programmed desorption (TPD) technique. Photocatalytic dissociation products formaldehyde (CD2O) and O-atoms on BBO sites (via D2O TPD product) have been detected. In addition to D2O formation by heating the photocatalyzed methanol/TiO2(110) surface, we have also observed D-2 product formation. O-2 is dearly formed via thermal recombination of the O-atoms on the BBO sites from photocatalysis of methanol. Experimental results indicate that D2O formation is more important than D-2 formation and that D-2 formation is clearly affected by the D2O formation process.