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首页> 外文期刊>RSC Advances >Methyl N-phenyl carbamate synthesis over Zn/Al/Ce mixed oxide derived from hydrotalcite-like precursors
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Methyl N-phenyl carbamate synthesis over Zn/Al/Ce mixed oxide derived from hydrotalcite-like precursors

机译：甲基N-苯基氨基甲酸酯在衍生自水滑石样前体的Zn / Al / Ce混合氧化物的合成

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摘要

Methyl N -phenyl carbamate (MPC) is an important intermediate for the green synthesis of methylene diphenyl diisocyanate (MDI) as well as many other important products. In the present work, Zn/Al/Ce mixed oxides derived from hydrotalcite-like precursors were employed as effective and recoverable heterogeneous catalyst for MPC synthesis via DMC aminolysis. Zn/Al/Ce hydrotalcite-like precursors prepared via coprecipitation method and the resulting catalysts were characterized by means of XRD, BET, SEM and XPS. Strong interactions within the Zn/Al/Ce mixed oxides were observed via the addition of appropriate amount of cerium. The mixed oxides containing 2.5% cerium showed high DMC aminolysis activity giving aniline conversion of 95.8%, MPC selectivity of 81.6% and MPC yield of 78.2%. Moreover, as a heterogeneous catalyst, it also exhibited superiorities of easy recovery and recyclable stability for MPC synthesis.
机译：甲基N-苯基氨基甲酸酯（MPC）是用于绿色合成亚甲基二苯基二异氰酸酯（MDI）的重要中间体，以及许多其他重要产品。在本作工作中，衍生自水滑石样前体的Zn / Al / Ce混合氧化物通过DMC氨基溶液作为MPC合成的有效且可回收的非均相催化剂。通过共沉淀法制备和所得催化剂制备的Zn / Al / Ce水滑石样前体，其特征在于XRD，BET，SEM和XPS。通过添加适量的铈，观察Zn / Al / Ce混合氧化物内的强相互作用。含有2.5％铈的混合氧化物显示出高DMC氨基溶活性，苯胺转化率为95.8％，MPC选择性为81.6％，MPC产率为78.2％。此外，作为异质催化剂，它还表现出易于回收和可回收稳定性的MPC合成的优势。

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