ISSN:
1572-879X
Keywords:
Pd-B modified catalysts
;
alkynes semihydrogenation
;
selectivity
;
Pd(111)-B surface reactivity
;
AES
;
TDS
;
hydrogen sorption
;
ethyne adspecies
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00763923
Permalink