糠醛是木制纤维素的水解产物,由于其分子结构中含有多个官能团且官能团的结构异常敏感,糠醛选择性催化加氢可制得2-甲基呋喃、糠醇、四氢糠醇、呋喃、四氢呋喃等一系列高附加值化学品。因此,制备了一种高活性、高选择性(四氢糠醇)、稳定性好及贵金属负载量低的负载型催化剂。采用硼氢化钠液相化学还原法合成了具有不同Pd负载量的Pd/WO₃催化剂(0.34%、2.0%和4.5%),考察了Pd的负载量及反应温度对Pd/WO₃催化糠醛选择性加氢的影响,结果表明,最佳反应条件为:2.0% Pd、反应时间为2 h、反应温度为150℃,此时糠醛转化率为99.0%,四氢糠醇选择性达92.2%。低温反应(100℃)时升高Pd负载量有利于提高催化剂性能,高温反应(150℃)时Pd最佳负载量为2.0%。

Furfural is a product from hydrolysis of lignocellulose.Because it contains multiple functional groups in its molecular structure and the structure of functional groups is extremely sensitive,a series of high-value chemicals,such as 2-methylfuran,furfuryl alcohol,tetrahydrofurfuryl alcohol,furan and tetrahydrofuran,can be obtained through selective catalytic hydrogenation of furfural.Thereby,a supported catalyst with low noble metal loading,high activity,high selectivity (for tetrahydrofurfuryl alcohol),and excellent stability is prepared.Pd/WO₃ catalysts with various Pd contents (0.34 wt%,2.0 wt% and 4.5 wt%) are prepared via NaBH₄ liquid phase chemical reduction method,and the effect of Pd content and reaction temperature on the catalytic behaviors of Pd/WO₃ for selective hydrogenation of furfural is also investigated.The optimal reaction conditions are determined as follows:the loading amount of Pd is 2.0 wt%,reaction lasts for 2 h,and reaction temperature is 150℃.Under the optimal conditions,the conversion of furfural reaches 99.0% and the selectivity of tetrahydrofurfuryl alcohol reaches 92.2%.The higher Pd loading is beneficial for improving the performance of the catalyst under low temperature reaction (100℃),while the optimal Pd loading is 2.0 wt% under high temperature reaction (150℃).

常德政(1983-),男,硕士,高级工程师,主要研究方向为冶金及节能环保技术,114694298@qq.com