XPS/SIMS investigation of Pt Catalysts for VOC oxidation)
Date Issued
2001
Date
2001
Author(s)
DOI
892214E002065
Abstract
Two crystalline h-BN’s(hexagonal boron nitride) and Al2O3 were used as supports. High-crystallinity BN was assigned as a-BN, and low-crystallinity BN was assigned as b-BN. Pt catalysts were prepared by incipient wetness using H2 PtCl6 as precursor. Pretreatment was performed under air or H2 /N2 mixture. The light-off temperature (LOT) of benzene deep oxidation was found below 150 C when Pt/BN was pretreated under air at 400 C, or H2 /N2 under 300 C. The 0.37 wt% Pt/a-BN with air pretreatment at 300 C also gave LOT below 150 C. However, the LOT’s were near 170 C for 3.7 wt% Pt/a-BN, 0.37 wt% Pt/b-BN and 3.7 wt% Pt/b-BN after pretreatment of air at 300 C. All LOT’s of Pt/BN were still below that of Pt/Al2 O3 which was above 250 C. From the XPS, the binding energy of Pt 4f7/2 indicated the reduced status of Pt, which is closely related to the LOT below 150 C. The reflective UV-vis observed the charge transfer band of Cl-Pt on the catalysts which gave LOT above 150 C. From the H2 TPR, the reduction temperature of Pt/BN was low because of negligible electron interaction between Pt and BN support. Thus Pt was maintained in reduced status and could activate oxygen molecule effectively. Therefore Pt/BN gave the high activity of oxidation. The activity and life-time of Pt/BN were not influenced by the small surface area and the weak anchorage of Pt under our experimental conditions.
Subjects
Pt
VOC
BN
Benzene
XPS
Publisher
臺北市：國立臺灣大學化學工程學系暨研究所
Type
report
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