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Volumn 44, Issue 22, 2005, Pages 3475-3477

Organometallic chemistry inside the pore walls of mesostructured silica materials

Author keywords

Heterogeneous catalysis; Hydrogenation; Mesoporous materials; Rhodium; Silicates

Indexed keywords

CATALYSIS; HYDROGENATION; ORGANOMETALLICS; POROUS MATERIALS; SILICA; SURFACE ACTIVE AGENTS; TRANSITION METAL COMPOUNDS;

EID: 20444417832     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200500454     Document Type: Article
Times cited : (61)

References (20)
  • 9
    • 20444427408 scopus 로고    scopus 로고
    • note
    • In a typical procedure, CTAB was first dissolved in water, HCl, and half of the amount of acetonitrile used in the gel composition. TEOS was then prehydrolyzed over 15 min at room temperature prior to the addition of the organometallic precursor that had been dissolved in the remaining portion of acetonitrile. The resulting solution was stirred for 3 h at room temperature. The solid product was collected by filtration, washed with water, and dried under vacuum overnight at 25°C.
  • 10
    • 20444364675 scopus 로고    scopus 로고
    • note
    • 3CN 4.3; HCl 9.2; CTAB 0.12. When a siloxane-containing transition-metal complex is used, the calculation of the molar composition is based on the total number of condensable silicon centers, from TEOS and the complex.
  • 11
    • 20444392203 scopus 로고    scopus 로고
    • note
    • The template was removed from the as-made material by batch extraction with dry ethanol at 50°C for 2 h. Three extraction cycles were necessary to complete the process.
  • 12
    • 20444387739 scopus 로고    scopus 로고
    • note
    • 2 as the silylating agents.
  • 13
    • 20444397931 scopus 로고    scopus 로고
    • note
    • The expansion of the structure upon silylation and extraction, indicated by the increase of the d(10) spacing is likely to be related to the decreased degree of hydrogen-bonding interactions between the surface hydroxy groups, which leads to a partial release of the internal surface tension.
  • 14
    • 20444415823 scopus 로고    scopus 로고
    • note
    • Elemental analysis: 1.5% wt P and 1.7% wt Rh.
  • 16
    • 20444388850 scopus 로고    scopus 로고
    • note
    • -1.
  • 17
    • 20444380889 scopus 로고    scopus 로고
    • note
    • We have demonstrated for an SBA-15 material that the postsynthetic grafting of the rhodium complex onto the surface of unmodified calcined silica dramatically reduces the specific area and the median pore-size diameter and that the effect varies inversely with rhodium loading (see the Supporting Information).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.