Improvement of surface activity of acetylene black by explosive shock loading

✍ Scribed by Yoshikazu Horiguchi; Yokan Nomura

• Publisher: Elsevier Science
• Year: 1965
• Tongue: English
• Weight: 194 KB
• Volume: 2
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(65)90018-7

✦ Synopsis

436 LETTERS TO THE EDITOR phase, ti is the fraction of active surface area covered at time t' and n, represents the saturation amount of chemisorbed oxygen. Since 8=?t'/nm, this equation can be integrated between the limits of n'=ns at t'=O and n'=n at t'=t to give n=nm-[(n--no) exp(-kCt)]. Curves calculated from the above equation by adjusting the values of n, and k are shown in Fig. 3. am, which was independent of chemisorption temperature and the presence of Fe, equalled 0.67f0.04 & mole 0,/g. It is estimated that this amount of 0, would be chemisorbed on ca. 3.7 per cent of the total surface area of the graphite, which corresponds closely to the percentage of the graphite particle surface which is edge area. Figure 4 presents Arrhenius plots for k. Activation energies (I&) and preexponential term values (A) are included. Since the uncertainty in Ea is f 2 kcalfmole, nothing can be said about the possibility of Fe affecting iZ& for Oz chemisorption. From the magnitude of A, it is concluded that the activated complex for 0, chemisorption loses all three translational degrees of freedom and part of one degree of rotational freedom.