ISSN:
1572-879X
Schlagwort(e):
Pd-B modified catalysts
;
alkynes semihydrogenation
;
selectivity
;
Pd(111)-B surface reactivity
;
AES
;
TDS
;
hydrogen sorption
;
ethyne adspecies
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract A new, supported Pd-B/SiO2 catalyst characterized by its high bond- and stereo-selectivity in semihydrogenation of -C≡C- triple bond is reported. To elucidate its mode of action a model system, Pd(111)-B, was exposed to H2, C2H2 or C2H4 and then investigated by means of AES-LEED-TDS methods. We conclude that there is a geometric blockage of Pd active surface sites by boron adspecies, that their total number diminishes and that the distribution of particular surface ensembles changes.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00763923
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