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Synthesis and characterisation of hybrid carbon-alumina support

机译：碳铝杂化载体的合成与表征

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Hybrid carbon-coated alumina supports have been synthesised using 4,4-methylenebis(phenylisocyanate) as carbon precursor. The adsorption of 4,4-methylenebis(phenylisocyanate) on the alumina support is irreversible, the resulting organic moiety can undergo pyrolysis under elevated temperature with the formation of carbon coating on the alumina support. Carbon loading in the synthesised materials and thus a degree of coverage of the alumina surface with carbon layer can be increased by repetition of 4,4'-methylenebis(phenylisocyanate) adsorption-pyrolysis cycles. The carbon coating does not substantially influence the pore structure of the initial alumina support. Upon increasing the carbon loading, the carbon coating becomes more uniform with respect to carbon localisation both on the internal and the external surface of the alumina support. The carbon coating on an alumina support can be discriminated from carbonaceous deposits due to a difference in the steady-state surface charging of the samples. Moreover, carbonaceous surface species which associated with C-O, C=O and O=C-O groups in carbon coating can also be identified. (c) 2005 Elsevier B.V. All rights reserved.
机译：已经使用4，4-亚甲基双（苯基异氰酸酯）作为碳前体合成了杂化的碳涂覆的氧化铝载体。 4，4-亚甲基双（苯基异氰酸酯）在氧化铝载体上的吸附是不可逆的，所得有机部分可在高温下进行热解并在氧化铝载体上形成碳涂层。通过重复4，4′-亚甲基双（苯基异氰酸酯）吸附-热解循环，可以增加合成材料中的碳负荷，从而提高氧化铝表面被碳层覆盖的程度。碳涂层基本上不影响初始氧化铝载体的孔结构。随着碳载量的增加，碳涂层就氧化铝载体的内表面和外表面上的碳定位而言变得更加均匀。由于样品的稳态表面电荷不同，可以将氧化铝载体上的碳涂层与碳质沉积物区分开。此外，还可以鉴定出与碳涂层中的C-O，C = O和O = C-O基团相关的碳质表面物质。 （c）2005 Elsevier B.V.保留所有权利。

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