大孔氧化铝对催化裂化催化剂性能的影响

Effect of macro-porous alumina on performance of fluid catalytic cracking catalysts

采用X射线衍射(XRD)仪、氮气吸附-脱附仪、傅里叶变换红外光谱仪等对3种大孔氧化铝(k 1,k 2,k 3)及分别采用3种大孔氧化铝所制备的催化裂化(FCC)催化剂(c 1,c 2,c 3)进行了分析表征,并在先进催化裂化装置(ACE)上对3种催化剂进行了反应性能评价。结果表明:3种大孔氧化铝组成无明显差异,主要由Al2O3组成,均具有多级孔道结构,且主要含L酸,不存在B酸,酸量高于拟薄水铝石;与常规FCC催化剂(c 0)相比,催化剂c 1,c 2,c 3具有更大的比表面积、孔体积,更高的酸量。ACE评价结果表明:与催化剂c 0相比,催化剂c 1,c 2,c 3的汽油收率依次增加了1.05,1.13,0.97个百分点,转化率依次增加了1.67,2.09,1.73个百分点,液体收率依次增加了1.31,1.41,1.04个百分点,表明加入大孔氧化铝后,可提高FCC反应性能及抗铁污染性能。

Three kinds of macro-porous alumina(k 1,k 2,k 3)and fluid catalytic cracking(FCC)catalysts(c1,c 2,c 3)prepared with the three kinds of macro-porous alumina were analyzed and characterized by X-ray diffraction(XRD)instrument,nitrogen adsorption-desorption instrument and Fourier transform infrared spectrometer,and the reaction performance of the three catalysts was evaluated on ACE evaluation unit.The results showed that there was no obvious difference in the composition of the three macro-porous alumina,which were all mainly composed of Al2O3,all of which had a multi-stage pore structure,and mainly contained L acid and no B acid,and the acid amount was higher than that of pseudo-boehmite;compared with conventional FCC catalyst(c 0),the catalyst c 1,c 2,c 3 had larger specific surface area,pore volume and higher acid amount.The results of ACE evaluation showed that compared to catalyst c 0,the gasoline yield of catalyst c 1,c 2 and c 3 had increased by 1.05,1.13,0.97 percentage points sequentially,the conversion rate had increased by 1.67,2.09,1.73 percentage points respectively,and the liquid yields had increased by 1.31,1.41,1.04 percentage points respectively,indicating that the addition of macro-porous alumina could improve the FCC reaction performance and iron pollution resistance.