STRUCTURE-REACTIVITY RELATIONSHIPS FOR BASIC CATALYSTS DERIVED FROM A MG(2+)/AL(3+)/CO(3)(2-) LAYERED DOUBLE HYDROXIDE
STRUCTURE-REACTIVITY RELATIONSHIPS FOR BASIC CATALYSTS DERIVED FROM A MG(2+)/AL(3+)/CO(3)(2-) LAYERED DOUBLE HYDROXIDE
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DOI：
10.1007/bf00811370
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发表时间：
1994-01-01
影响因子：
2.8
通讯作者：
PINNAVAIA, TJ
中科院分区：
文献类型：
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作者：
CONSTANTINO, VRL;PINNAVAIA, TJ
以2-甲基-3-丁炔-2-醇（MBOH）为酸碱选择性底物，测定了层状双氢氧化物[Mg_（2.34）Al（OH）_（6.68）]（CO_3）_（0.5- 2.6）H_2 O热活化后催化剂的比活性。丙酮和乙炔是在80-150 ℃的温度范围内形成的唯一反应产物，这表明所有LDH衍生的催化剂都具有高度的碱性选择性。低于LDH的结构分解点（小于或等于250 ℃）的热活化提供了比活性比通过分别在450和890 ℃下的热活化形成的无定形金属氧化物和结晶MgAl 2 O 4尖晶石-MgO混合物大大约一个数量级的催化剂。即使是在350 ℃下通过部分脱碳酸/脱羟基形成的残留LDH结构也比更常用的金属氧化物衍生物具有更高的活性。
The specific activities of catalysts formed by thermal activation of the layered double hydroxide [Mg2.34Al(OH)6.68](CO3)0.5-2.6H2O have been determined using 2-methyl-3-butyn-2-ol (MBOH) as an acid/base-selective substrate. Acetone and acetylene were the only reaction products formed over the temperature range 80-150-degrees-C, demonstrating that all of the LDH-derived catalysts have highly basic selectivities. Thermal activation below the structural decomposition point of the LDH (less-than-or-equal-to 250-degrees-C) afforded catalysts with specific activities approximately an order of magnitude larger than the amorphous metal oxides and crystalline MgAl2O4 spinel-MgO mixtures formed by thermal activation at 450 and 890-degrees-C, respectively. Even the remnant LDH structure formed by partial decarbonation/dehydroxylation at 350-degrees-C was substantially more active than the more commonly used metal oxide derivatives.