【作者】 图亚；

【导师】 谭涓；

【作者基本信息】 大连理工大学 ， 工业催化， 2012， 硕士

【摘要】 催化裂化(FCC)过程是炼油产业中的核心工艺,是原油二次加工技术的重要组成部分,FCC技术的革新,关键在于催化剂的发展。近年来随着原油的重质化、劣质化日益严重,迫切需要开发新型的FCC催化剂,以提高其裂化重油大分子的能力。高硅铝比的超细Y分子筛由于具有较大的外表面积,催化活性点相对增多,反应物及产物的晶内扩散速率提高,以及良好的结构稳定性等特点,能够适应于原油催化裂化苛刻的反应条件,因此,有望替代现有的FCC催化剂,具有广阔的应用前景。在我们前期工作中,已成功实现了采用廉价的工业原料,在无模板剂和添加剂的条件下,低成本直接制备出高硅铝比超细NaY分子筛(HSY-M2)。本文尝试开发了新的直接法合成工艺(M-Ⅲ),制备了高硅铝比超细NaY分子筛(HSY-M3)。研究表明,HSY-M3-02样品的骨架硅铝比可达7.1,晶粒大小在260nm左右。在此基础上,我们对其进行了水热处理,采用XRD、SEM、N2-adsorption、Raman、TG和Py-IR等手段对水热处理后样品的结构和物化性质进行了研究,并以二异丙苯为模型化合物,在小型固定床反应装置上对改性样品的催化裂化性能进行了评价。结果表明,经过水热超稳化处理后,高硅铝比超细Y分子筛样品(HSY-M3-02)的结晶保留度可达81%,骨架硅铝比达14.8,比表面积为603.3m2/g。在常压,反应温度为350℃,空速为6h-1的条件下5h内催化裂化二异丙苯的平均裂化率为39.9%,比工业USY提高了6.2%,并且在反应过程中表现出较好的稳定性,因此具有很好的工业应用前景。更多还原

【Abstract】 Fluid catalytic cracking (FCC) process is a core technology of crude oil cracking, which is the important part of components in morden petroleum refineries. The FCC technology innovation, the key lies in the catalyst of development. However, the crude oil quality is becoming more and more serious. It is urgent to develop novel FCC catalysts for catalytic cracking of heavy oil. The superfine zeolite Y with high SiO2/Al2O3ratio can significantly improve the catalytic cracking selectivity for reduced coking, increase diesel yield and the gasoline qulity because to the fact that superfinesized Y have very huge surface areas, and very fastly diffusion characteristics. That is why, How to fastly, directly and efficiently synthesize of superfine zeolite Y with high SiO2/Al2O3ratio, it can be provided powerful support for the development of catalytic cracking technology.Superfine zeolite Y with high SiO2/Al2O3ratio had synthesized using cheap industrial raw materials without the presence of chemical additive via non-template method. On the basis of the preliminary work, using the direct synthesis were prepared Superfine zeolite Y with high SiO2/Al2O3ratio (HSY-M3), Studied the influence of different synthesis conditions. The results show that the Superfine zeolite Y products (HSY-M3-02) with the size at about260nm and the skeleton stability SiO2/Al2O3ratio reach7.1can be synthesized by optimization methods of the synthesis conditions. And then, the structure and physicochemical properties of superfine zeolite Y with high SO2/Al2O3ratio (M3-02) treated by hydrothermal treatment were characterized by SEM, XRD, N2-adsorption,Raman,TGA and Py-IR.The catalytic performance of HSY-M3-02sample was also investigated in a fixed-bed reactor using DIPB as model compound. The results showed that after hydrothermal treatment, the crystallinity of M3-02reached up to81%. The SiO2/Al2O3ratio was14.8with a specific surface area of603.3m2/g. Under the conditions of T=350℃,P=1atm, and WHSV=6h-1,the average cracking rate of DIPB over M3-02was40%and6.2%higher than that over industrial zeolite USY during5hours, So it has good industry application prospects.更多还原