Fe-多级孔Hβ的制备及催化合成二苯甲烷性能

Preparation and Catalytic Benzylation Performance of Fe-hierarchical Porous Hβ

摘要:

用NaOH溶液对Hβ进行处理，得到多级孔Hβ分子筛。在0.1 mol/L碱浓度条件下，采用浸渍法制备Fe-多级孔Hβ分子筛。通过XRD、XRF、N2吸附-脱附、SEM-EDS、傅里叶红外转换光谱、NH3-TPD和Py-FTIR对样品进行表征。结果表明，适当的碱浓度处理在保持Hβ分子筛微孔骨架的同时，引入了介孔，Fe-多级孔Hβ分子筛仍能保持微介孔结构，活性组分Fe2O3能够很好地分散在载体表面。以苯和氯化苄为原料，考察其催化合成二苯甲烷的性能。与Fe-Hβ催化剂相比，Fe-多级孔Hβ有效地提高了反应物和产物的扩散性能，氯化苄的转化率、二苯甲烷的选择性分别提高了9.4%和3.2%，同时催化剂表现出良好的抗失活能力。

Abstract:

Hierarchical porous Hβ molecular sieve was obtained by alkaline treatment of NaOH solution for Hβ molecular sieve. Fe-hierarchical porous Hβ molecular sieve was prepared by impregnation method under the condition of 0.1 mol/L alkali concentration. The samples were characterized by XRD, XRF, N2 adsorption-desorption, SEM-EDS, Fourier transform infrared spectroscopy, NH3-TPD and Py-FTIR. The results showed that the samples with the proper alkali concentration treatment could maintain the microporous framework of Hβ molecular sieve while mesopore was introduced. Fe-hierarchical porous Hβ molecular sieve also could maintain the micro-mesoporous structure, and the active component Fe2O3 could be well dispersed on the surface of the carrier. The benzene and benzyl chloride were used to investigate the performance of Fe-hierarchical porous Hβ in the synthesis of diphenylmethane reaction. Compared with the Fe-Hβ catalyst, Fe-hierarchical porous Hβ effectively improved the diffusion performance of the reactants and products. The conversion of benzyl chloride and the selectivity of diphenylmethane increased by 9.4% and 3.2%. In the meantime, the catalyst showed excellent anti-deactivation ability.