Boron nitride supported Pt catalyst for selective hydrogenation
Boron nitride supported Pt catalyst for selective hydrogenation
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DOI：
10.1007/s10562-005-5860-8
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发表时间：
2005-08
影响因子：
2.8
通讯作者：
J. Wu;Chao-Yu Chen;Shawn D. Lin
中科院分区：
文献类型：
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作者：
J. Wu;Chao-Yu Chen;Shawn D. Lin
与传统的Pt/γ-Al2O3催化剂相比，新型氮化硼（BN）负载的Pt催化剂在α-,β-不饱和醛的选择性加氢中表现出特殊的催化行为。巴豆醛的氢化是使用H2/巴豆醛摩尔比为59的混合物在30至300°C的温度范围内进行的。 Pt/BN 在 30–100 °C 的温度范围内对丁醛的选择性接近 100%，而 Pt/γ-Al2O3 对巴豆醇表现出良好的选择性。丁醛是Pt/BN上的主要产物，因为巴豆醛的C=C键由于负载效应在低温下优先氢化。 BN具有类石墨结构作为惰性载体，在氢化过程中可以排斥巴豆醛的C=O端。随着温度的升高，产物分布从动力学控制转变为热力学控制，最终在 250–300 °C 时氢化成为热力学主导。
A novel boron nitride (BN) supported Pt catalyst showed a special catalytic behavior in the selective hydrogenation of α-, β-unsaturated aldehyde compared with a traditional Pt/γ-Al2O3catalyst. The hydrogenation of crotonaldehyde was carried out using a mixture of H2/crotonaldehyde molar ratio 59 at temperature range from 30 to 300 °C. Pt/BN gave near 100% selectivity of butyraldehyde in the temperature range of 30–100 °C while Pt/γ-Al2O3showed a favorable selectivity of crotyl alcohol. Butyraldehyde was the main product on Pt/BN because the C=C bond of crotonaldehyde was preferentially hydrogenated at low temperature due to the support effect. BN possess graphite-like structure as an inert support and may repel C=O end of crotonaldehyde during hydrogenation. The products distribution transited from kinetic to thermodynamic control with increasing temperature, and finally the hydrogenation became thermodynamically dominant at 250–300 °C