Abstract
AFM has been used to study the effects of pretreatment gases on Pd/SiO2 supported thin film catalysts during 1,3-butadiene hydrogenation. The Pd/SiO2 catalyst, treated with O2 followed by H2 at 450°C, has an initial conversion of 85% and a surface morphology of 60 x 65 nm2 Pd grains and only deactivates slightly. After a second treatment, the reactivity was fully recovered and the surface morphology exhibits a redispersion of the Pd grains. The catalyst with a similar initial reactivity and morphology but only treated in H2, shows a decrease in activity and coalescence of Pd grains after repeated treatment. XPS studies have shown that the O2 and H2 treated Pd/SiO2 catalyst has a lower Pd binding energy than the H2 treated Pd/SiO2. The effect of the substrate thickness and composition is also reported.
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References
G. Binnig, C.F. Quate and Ch. Gerber, Phys. Rev. Lett. 56 (1986) 930.
X. Chu, L.D. Schmidt, S.G. Chen and R.T. Yang, J. Catal. 140 (1993) 543.
X. Chu and L.D. Schmidt, J. Catal. 144 (1993) 77.
A.M. Baro, A. Bartolome, L. Vazquez, N. Garcia, R. Reifenberger, E. Choi and R.P. Andres, Appl. Phys. Lett. 51 (1987) 159.
K.L. Yeung and E.E. Wolf, J. Catal. 143 (1993) 409.
K.L. Yeung and E.E. Wolf, Catal. Lett. 12 (1992) 213.
M. Komiyama, S. Morita and N. Mikoshiba, J. Microscopy 152 (1988) 197.
M. Komiyama, J. Kobayashi and S. Morita, J. Vac. Sci. Technol. A 8 (1990) 608.
K. Yeung and E.E. Wolf, J. Vac. Sci. Technol. A 10 (1992) 651.
K. Yeung and E.E. Wolf, J. Catal., accepted.
C. Lee and L.D. Schmidt, J. Catal. 101 (1986) 123.
C. Lee, L.D. Schmidt, J.F. Moudler and T.W. Rusch, J. Catal. 99 (1986) 472.
T. Wang and L.D. Schmidt, J. Catal. 78 (1982) 306.
T. Nakayama, M. Arai and Y. Nishiyama, J. Catal. 87 (1984) 108.
B. Tardy, C. Noupa, C. Leclercq, J.C. Bertolini, A. Houreau, M. Treilleux, J.P. Faure and G. Nihoul, J. Catal. 129 (1991) 1.
J. Massardier, J.C. Bertolini and A. Renouprez, in:Proc. 9th Int. Congr. on Catalysis, Vol. 3, eds. M.J. Phillips and M. Ternan (Chem. Inst. of Canada, Ottawa, 1988) p. 1222.
C.-M. Pradier and Y. Berthier, J. Catal. 129 (1991) 356.
V. Pitchon, M. Guenin and H. Praliaud, Appl. Catal. 63 (1990) 333.
J.M. Rickard, L. Genovese, A. Moata and S. Nitsche, J. Catal. 121 (1990) 141.
C.-M. Pradier, E. Margot, Y. Berthier and J. Oudar, Appl. Catal. 31 (1987) 243.
B. Schleich, D. Schmeisser and W. Gopel, Surf. Sci. 191 (1987) 367.
T.H. Fleisch, R.F. Hicks and A.T. Bell, J. Catal. 87 (1984) 398.
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Lee, K.H., Wolf, E.E. AFM studies of Pd silica supported thin film catalysts. Catal Lett 26, 297–314 (1994). https://doi.org/10.1007/BF00810603
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DOI: https://doi.org/10.1007/BF00810603