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Volumn 25, Issue 11, 2009, Pages 6476-6485

Pd-supported catalysts: Evolution of support porous texture along Pd deposition and alkali-metal doping

Author keywords

[No Author keywords available]

Indexed keywords

CARBONATE CONCENTRATIONS; DOPED SAMPLE; HIGH PLASTICITY; METAL-DOPING; MICROSCALE LEVELS; PD PARTICLE; PD-SUPPORTED CATALYSTS; PORE COLLAPSE; PORE NARROWING; POROUS STRUCTURES; POROUS TEXTURE; POTASSIUM CARBONATES; PRECIPITATING AGENTS; SUPPORT MORPHOLOGY; SUPPORTED PD CATALYSTS; THERMAL TREATMENT; TOTAL COLLAPSE;

EID: 66749088078     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la900084p     Document Type: Article
Times cited : (32)

References (55)
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    • Geus, J. W.; van Dillen, A. J. Preparation of supported catalysts by deposition-precipitation. In Handbook of Heterogeneous Catalysis; Ertl, G., Knözinger, H., Weitkamp, J., Eds.; Wiley-VCH: Weinheim, Germany, 1997; Vol. 1, pp 240-257.
    • (1997) Handbook of Heterogeneous Catalysis , vol.1 , pp. 240-257
    • Geus, J.W.1    van Dillen, A.J.2
  • 39
    • 9944257757 scopus 로고    scopus 로고
    • Physicochemical aspects of preparation of carbon-supported noble metal catalysts
    • Wieckowski, A, Savinova, E. R, Vayenas, C. G, Eds, Marcel Dekker, Inc, New York
    • Simonov, P. A.; Likholobov, V. A. Physicochemical aspects of preparation of carbon-supported noble metal catalysts. In Catalysis and Electrocatalysis at Nanoparticle Surfaces; Wieckowski, A., Savinova, E. R., Vayenas, C. G., Eds.; Marcel Dekker, Inc.: New York, 2003; pp 409-454.
    • (2003) Catalysis and Electrocatalysis at Nanoparticle Surfaces , pp. 409-454
    • Simonov, P.A.1    Likholobov, V.A.2
  • 43
    • 66749083796 scopus 로고    scopus 로고
    • norm = Wt(873)/[1 - ΔWt].
    • norm = Wt(873)/[1 - ΔWt].
  • 45
    • 66749191997 scopus 로고    scopus 로고
    • Considering the simplest model of pores, i.e., cylindrical blind pores, if carbonate is spread on the walls of the pores, their diameter decreases, causing a decrease of equal to the of salt and proportional to decrease of the diameter. If the carbonate occupies the bottom of the blind pores, the pore diameter does not change, and the decrease is still equal to the of salt. If the cap is over the bottom of the pores, the diameter does not change, and the closer the cap is to the pore mouth, the bigger the decrease.
    • Considering the simplest model of pores, i.e., cylindrical blind pores, if carbonate is spread on the walls of the pores, their diameter decreases, causing a decrease of volume equal to the volume of salt and proportional to decrease of the diameter. If the carbonate occupies the bottom of the blind pores, the pore diameter does not change, and the volume decrease is still equal to the volume of salt. If the "cap" is over the bottom of the pores, the diameter does not change, and the closer the "cap" is to the pore mouth, the bigger the volume decrease.
  • 46
    • 66749105651 scopus 로고    scopus 로고
    • It should be noted that, while in most cases Dm and the maximum of pore size distribution have similar values, samples with maximum distribution around 500-550 Å exhibit a Dm around 380 Å. The reason of this discrepancy is the presence of a very small fraction of micropores, which contribute much more to As than to Vp. There is neither information available in order to understand the origin of such micropores probably localized etching, nor indications that their presence nullifies the reported findings, so, in the following, this fact will no longer be discussed
    • p. There is neither information available in order to understand the origin of such micropores (probably localized etching), nor indications that their presence nullifies the reported findings, so, in the following, this fact will no longer be discussed.
  • 47
    • 66749109832 scopus 로고    scopus 로고
    • The unchanged porous texture characteristics do not necessarily imply that the chemistry of the surface remains unchanged: the value of parameter c for the PdK20(H2O) sample (180) lies between the values of the unwashed PdK20 sample (199) and the samples with lower K content 152-163
    • 2O) sample (180) lies between the values of the unwashed PdK20 sample (199) and the samples with lower K content (152-163).
  • 48
    • 66749152527 scopus 로고    scopus 로고
    • The decomposed fraction is roughly 80% in the PdK4 sample and 30% in the PdK20 one.
    • The decomposed fraction is roughly 80% in the PdK4 sample and 30% in the PdK20 one.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.