Study On Structure And Cracking Activity Of Lanthanon Modification Of Inner Mongolia Hard Kaolin Of Coal Measures

In the developing history of oil's catalyzing and cracking, Kaolin keeps playing an increasingly important function. Today, Kaolin becomes the important material of all kinds of cracking catalyst. In order to directly use Kaolin as FCC catalyst in industry, a lot of studies were done, most of which focused on Kaolin of non-coal measures of Inner Mongolia. And there were few studies about Kaolin of coal measures of Inner Mongolia. Adding lanthanon can make Kaolin of coal measures of Inner Mongolia more stable and carbon less as well as give it a more ideal acid distribution and catalyzing effect, which makes it a necessary process. However, lanthanon process is mainly for stability and carbon. Acid distribution takes the most important role in cracking. Therefore, by combining these two methods to make up for each other, a best result can be achieved.First, lanthanon was added to original Kaolin of coal measures of Inner Mongolia and acid treated Kaolin. Then, a series of Kaolin samples were made by different acid treaded period (0~2.5 hours) and lanthanon content (0.99%, 1.96%, 2.91%, 3.85%, 4.76%, 5.7%). Before and after the treatment, BET pore volume, surface area and pore distribution were tested by BET method. And pyridine-TPD and cracking activity were also tested. The difference of structure and cracking catalyzing capability were discussed.The experiments show that lanthanon treatment enlarges original kaolin's pore distribution and pore diameter but decreases its adsorption pore volume. For acid treated Kaolin, adding lanthanon makes bad influence on pore volume and surface area. Adding lanthanon to original kaolin increases original kaolin's absorption of pyridine, while adding lanthanon to acid treated kaolin decreases its absorption of pyridine. The longer the time of acid treatment, the better surface absorption of pyridine for Kaolin. By increasing the content of lanthanon to acid treated Kaolin, weak sites disappear completely, and strong sites'and medium sites'pyridine desorption temperature declines and pyridine absorption is weakened. Acid treated Kaolin, with and without adding lanthanon, is better for diesel oil transformation than original Kaolin of coal measures of Inner Mongolia. Adding lanthanon makes carbon less and desulphurization better.By analyzing the experiment data, some other conclusions also can be generated. During the process of cracking catalyzing, Acid treated Kaolin with lanthanon's strong sites are to decrease carbon and to desulphurize, while it gives bad influence on gasoline output. Medium sites are the main factor in increasing diesel oil transformation and gasoline selectivity.Acid treated for 2.5 hours with less than 0.99% lanthanon gives Kaolin of coal measures of Inner Mongolia a good cracking catalyzing activity, effectively reduces the content of sulfur and carbon as well as extends its life-span which enables Kaolin as the catalyst in the industrial FCC process.