超稳含硅介孔Al_2O_3及其催化裂化应用  

Preparation and Characterization of Ultrastable Mesoporous Silicated Alumina and Its Application in Catalytic Cracking

作　　者：施宗波 王一萌[1] SHI Zongbo;WANG Yimeng(Shanghai Key Laboratory of Green Chemistry and Chemical Process,East China Normal University,Shanghai 200062,China;Rezel Catalytic Technologies Ltd.,Chengdu 610041,China)

机构地区：[1]华东师范大学绿色化学与化工过程绿色化重点实验室,上海200062 [2]四川润和催化新材料股份有限公司,四川成都610041

出　　处：《石油学报（石油加工）》2018年第5期863-871,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：科技部科技支撑计划项目(2012BAE05B02);四川省科技成果转移项目(13CGZHZX0436)基金资助

摘　　要：利用水解正硅酸四乙酯对薄水铝石进行后修饰,通过焙烧可以得到含硅Al_2O_3。采用X射线衍射、红外、物理吸附、固体核磁共振、NH_3程序升温脱附等手段表征含硅Al_2O_3的孔道结构和酸性质。考察了含硅Al_2O_3的热稳定性和水热稳定性及其对烃类的催化裂化活性。结果表明,SiO_2主要以单层形式嫁接在γ-Al_2O_3表面Al—OH上,形成了Si—O—Al键,并大幅提高其对烃类的裂化活性。当1nm2的γ-Al_2O_3表面含3.2个Si原子时,其对异丙基苯的催化裂化转化率为原料γ-Al_2O_3的27倍。在1100℃高温空气下焙烧,或在800℃高温水蒸气气氛下焙烧,含硅Al_2O_3的晶体结构和催化活性都能较好地保留。The silicated alumina was synthesized by grafting of hydrolytic silicon specials on the surface of AlOOH,and a calcination step.The textural and acidity properties of the resultant materials were characterized by various techniques,i.e.powder X-ray diffraction(XRD),infrared(IR)spectroscopy,N 2 adsorption/desorption,nuclear magnetic resonance(NMR)spectroscopy,and temperature programmed desorption of ammonia(NH 3-TPD).The results show that the monolayer SiO 2 majorly grafts on the alumina surface,where the specific surface reactivity ofγ-Al 2O 3 to realize a new class of silicated alumina catalysts featuring is well-defined.Because of the enhanced Lewis acid sites and new formed Si-O-Al species,the silicated alumina shows high activity in the cracking of hydrocarbon.Such as,the cumene(IPB)cracking conversion for silicated alumina sample with 3.2 Si atoms per square nanometer is 27 times as high as that of starting alumina.The crystal structure and cracking activities of silicated alumina are well preserved after calcination at 800℃for 4 h in steam or at 1100℃for 6 h in air.

关 键 词：含硅Al2O3 介孔 催化裂化 热稳定性 

分 类 号：O643[理学—物理化学]