Ni-Fe/CaO催化己二腈部分加氢制备6-氨基己腈

Partial hydrogenation of adiponitrile catalyzed by Ni/CaO to prepare amino-adiponitrile

摘要:

与传统工艺相比，丁二烯氢氰化法制备己内酰胺具有绿色、经济、环境友好等特点，其中己二腈（ADN）部分加氢制备6-氨基己腈（ACN）是该工艺的核心步骤。该文以尿素为沉淀剂，采用沉积沉淀法制备了Ni/CaO和Ni-Fe/CaO催化剂，并将其应用于ADN部分加氢制备ACN。XRD结果表明，Fe掺杂后的催化剂生成了FeNi3合金相；TEM结果表明，Fe掺杂后金属Ni变得更加分散。考察了反应温度、反应压力对ADN加氢性能的影响，实验结果表明，在80 ℃、4 MPa、催化剂用量为0.1 g的温和条件下反应2h，ADN转化率为87.5%，ACN选择性为74.4%，失活后的催化剂经过氢气还原后能够重复使用。

Abstract:

Compared with the traditional process, the preparation of caprolactam by butadiene has the green, economical and environmentally friendly characteristics in which the partial hydrogenation of adiponitrile (ADN) to produce 6-aminohexonitrile (ACN) is the core step of the process. Ni/CaO ADN Ni-Fe/CaO catalysts were prepared by the deposition-precipitation method using urea as precipitant ADN applied to the partial hydrogenation of adiponitrileto prepare 6-aminohexanenitrile. XRD showed that FeNi3 alloy phase was formed in the catalyst after Fe doped, and TEM showed that the metal Ni became more dispersed after Fe doped. The effect of reaction temperature ADN reaction pressure on the hydrogenation performance of ADN was investigated. The experimental results showed that the ADN conversion was 87.5% and the ACN selectivity was 74.4% under mild conditions of 80 ℃, 4 MPa and 0.1 g of catalyst for 2h. ADN it was found that the catalyst could be regenerated after hydrogen reduction.