High HDS activity of View the MathML source modified by some chelates and their surface fine structures

The effect of some chelating reagents (NTA, EDTA, CyDTA) on the activities (HDS, HY) and the fine structure (CUS, dispersion) of View the MathML source catalyst was investigated by means of a high pressure flow reactor, NO uptake measurement, and EXAFS. The sensitivity of the reaction to the promoting effect of the chelating reagents was as follows: HDS of benzothiophene (BT) > HDS of dibenzothiophene (DBT) = HY of o-xylene > HY of 1-methylnaphthalene (1-MN). In HDS reaction of BT, the promoting effect was as follows: CyDTA > EDTA > NTA > 0. The activity of View the MathML source for HDS of BT was 70% higher than that of View the MathML source. The number of CUS from the NO uptake measurement was as follows: CyDTA-Co-Mo > Co-Mo > NTA-Co-Mo > EDTA-Co-Mo. Mo K-edge EXAFS also showed that the addition of the chelates does not increase the dispersion of Mo. It was concluded that the chelating reagents promote the catalyst activity by effective formation of highly active sites.