CASH法制备高比表面积Mo-Al催化剂及其脱硫性能研究

DESULFURIZATION PERFORMANCE OF Mo-Al CATALYSTS WITH HIGHER SURFACE AREAS PREPARED BY CASH METHOD

通过软-硬模板(CASH)法制备了高比表面积载体Al2O3,再利用浸渍法制备了一系列不同MoO_(3)负载量的Mo-Al催化剂。通过XRD、N_(2)吸脱附、拉曼光谱、H_(2)-TPR和FT-IR等表征手段对催化剂的物化性质进行了表征,考察了其在含二苯并噻吩模拟油的萃取催化氧化脱硫体系中的性能。结果表明,与软模板法制备的载体和商用载体相比,在相同MoO_(3)负载量下,利用CASH法制备的载体浸渍后的Mo-Al催化剂拥有更大的比表面积,Mo物种分散更为均匀,且与Al相互作用更强,导致形成了更多的Al_(2)(MoO_(4))_(3)活性中心。30Mo-Al催化剂表现出更为优异的催化性能,脱硫率可达100%。催化剂重复使用10次后,脱硫率仅下降2.3%。

The Al2O3 sample with higher surface area was firstly prepared by combined assembly of soft and hard templates(CASH)method,and then,a series of Mo-Al catalysts with different MoO_(3) loadings were prepared by impregnation method.The physical chemical properties of these catalysts were characterized by XRD,N_(2) adsorption and desroption,Raman spectroscopy,H_(2)-TPR and FT-IR techniques,and their catalytic performances were investigated in the extraction catalytic oxidation desulfurization of simulated oil containing dibenzothiophene as sulfur component.The results showed that compared to the commercial carrier and carrier prepared by soft method,higher surface areas and higher dispersion of molybdenum species for the Mo-Al catalysts prepared by CASH method could be obtained.More effective Al_(2)(MoO_(4))_(3) components were formed due to the stronger interaction of molybdenum and aluminum species.The 30Mo-Al catalyst showed higher catalytic performance than other catalysts,and the desulfurization ratio could reach 100%.After reused for 10 times,the desulfurization rate of the 30Mo-Al catalyst decreased by only 2.3%.