By Levy Shaked
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Additional resources for A Transform Domain Hardcopy Watermarking Scheme
One intermediate (a πbonded η2-cyclopentene) can rotate in a non-activated mechanism via an allylic intermediate. The model reveals the number of rotations each intermediate experiences, and can be as high as ~20, even if only 5 D atoms are observed in the product. This number of rotations is a better measure of the H/D exchange than the conventional ‘multiplicity’. The H/D exchange of CP together with these insights can now be applied to investigate in detail the influence of the support on the catalytic properties of supported metal particles.
The final metal particle size is approximately 10-12 Å and the metal particles are relatively uniform. Calcination In Table 1, the results of H2 chemisorption, HRTEM and EXAFS analysis are given for this pretreatment. QEXAFS during the calcination (Figure 10) shows a constant number of oxygen (or nitrogen) neighbors up to 200°C. This higher stability of [Pt2+(NH3)4](NO3-)2 in O2 compared to the stability in H2 is in agreement with the observations of Kinoshita et al20. As expected during calcination, no metallic Pt-Pt contribution was present for the whole temperature range.
Simultaneous to the desorption of these gases, QEXAFS shows a large decrease in the whiteline in the temperature range of 200-250°C. 5. This implies that the Pt complex is reduced to a great extent in this temperature range. In the preceding paragraph (direct reduction), it was shown that production and decomposition of NH4NO3 is not necessarily coupled to the reduction of the Pt2+ complex. However, the gases produced during the decomposition might very well influence the Pt2+ complex. This is apparent when the 1st derivative of the whiteline as a function of temperature is compared with the desorption of H2O (Figure 12).
A Transform Domain Hardcopy Watermarking Scheme by Levy Shaked