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对浸渍法制备的负载型Ni-Cu/γ-Al2O3催化剂,用Na和Cr进行酸碱性调节,并通过H2,NH3和CO2程序升温脱附(TPD)技术表征了催化剂H2吸附能力和酸碱性质。结果显示,Cr和Na改性后催化剂的酸碱性质得到了调节,H2吸附能力显著增强,其中Cr与Na联合改性后的样品Ni-Cu-Cr-Na/γ-Al2O3具有最小的低强度酸量、最大的低强度碱量和最大的H2吸附能力。催化剂月桂腈加氢性能表明,在氢分压2.0MPa、反应温度70℃、反应时间30min时,Ni-Cu-Cr-Na/γ-Al2O3催化剂具有最大活性,月桂腈的转化率为98%,月桂伯胺的选择性为99.2%。催化剂稳定性好,重复使用10次后,月桂腈的转化率由98%降为94.6%,月桂伯胺的选择性仍维持在98%以上。
The supported Ni-Cu / γ-Al2O3 catalysts prepared by impregnation method were acid-base adjusted with Na and Cr, and the adsorption capacity of H2 and acid-base were characterized by temperature-programmed desorption (TPD) nature. The results showed that the acid-base properties of the catalysts modified by Cr and Na were adjusted, and the H2 adsorption capacity was significantly enhanced. The Ni-Cu-Cr-Na / γ-Al2O3 samples modified with Cr and Na had the lowest low-strength The amount of acid, the maximum amount of low-intensity alkali and the maximum H2 adsorption capacity. The hydrogenation performance of catalyst lanthanon showed that Ni-Cu-Cr-Na / γ-Al2O3 catalyst had the highest activity at a hydrogen partial pressure of 2.0 MPa, a reaction temperature of 70 ℃ and a reaction time of 30 min. The conversion of laurinonitrile was 98% The selectivity of lauryl amine is 99.2%. The stability of the catalyst is good. After 10 times of repeated use, the conversion of laurin to nitrile is reduced from 98% to 94.6%, and the selectivity of lauryl amine is still above 98%.