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9
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20444427408
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note
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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.
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10
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20444364675
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note
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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.
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11
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20444392203
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note
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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.
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12
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20444387739
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note
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2 as the silylating agents.
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13
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20444397931
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note
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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.
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14
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20444415823
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note
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Elemental analysis: 1.5% wt P and 1.7% wt Rh.
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16
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20444388850
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note
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-1.
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17
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20444380889
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note
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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).
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19
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0000806192
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b) J. M. Grosselin, C. Mercier, G. Allmang, F. Grass, Organometallics 1991, 10, 2126;
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Grosselin, J.M.1
Mercier, C.2
Allmang, G.3
Grass, F.4
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