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Home > Blog >

Successful Trial Production of Multi-stage Porous Alumina New Materials

2019-07-11
The high-stability multi-stage porous alumina material APM-9 developed by the Refining Research Institute of PetroChina Lanzhou Chemical Research Center was successfully trial-produced. The test results of continuous multi-batch products show that the total specific surface area of alumina materials is above 500m2/g, and the total pore volume is above 2.0m3/g. The various indexes have reached the expected targets, which will provide high-performance carrier materials for catalyst design.
 
APM-9 has the advantages of high pore volume, large specific surface area, excellent hydrothermal stability, and excellent performance against heavy metals. Since the metal molecules contained in the heavy oil are in the form of colloidal and asphaltene macromolecules, the diameter of the asphaltene molecules is 4 to 5 nm, and the diameter of the formed asphaltic micelles is mostly above 20 nm. The high pore volume and large size of APM-9 The specific surface area reduces the reaction-diffusion resistance can accommodate more carbon deposits, metal deposits, and improves the activity and stability of the catalyst.
At present, China's petroleum industry has been facing the challenge of heavy oil heavy-duty. Catalytic cracking is an important way to light crude oil. Among the many factors affecting the efficiency of catalytic cracking, catalysts are the most active and potential areas for catalytic cracking technology. For catalytic cracking catalysts, alumina or silica-alumina carrier matrix materials have always been the focus of research by major catalyst companies. Their pore structure and acid characteristics play an important role in strengthening catalytic cracking heavy oil conversion, improving product selectivity and prolonging service life. At the same time, porous inorganic materials are considered to be the most important class of catalysts and catalyst carriers in the catalytic industry due to their open structure and large surface area. Therefore, porous alumina materials have become an important research direction in the field of catalysis.
 
Lanzhou Center has been engaged in the research of catalytic cracking catalyst carrier. For the demand of the catalytic cracking high specific surface area, large pore volume, high activity, and high stability porous alumina material, Lanzhou Center are based on industrial application, in high stability multi-grade pore alumina. Material development has been progressing continuously.
 
In 2015, the center developed a multi-stage material APM-7 rich in B acid for the catalytic cracking catalyst carrier material containing only L acid, gasoline and coke selectivity. The material has a high pore volume and a large pore size. Compared with the conventional carrier material, the pore size is increased from 3.4 nm to 60 nm, and the pore volume is increased from 0.35 cm 3 /g to 1.5 cm 3 /g, which is increased by 15 times and 4 times, respectively. At the same time, they also developed a modification method for multi-stage pore materials. Before and after modification, the specific surface area retention rate of the material after hydrothermal aging at 800 ° C for 17 hours was increased from 20% to 85%.
After that, based on the multi-stage porous silica-alumina material, the center invented the directed introduction technique of the B acid center, and the B/L acid ratio reached 1.5. Active center accessibility studies characterized by alkaline model probe molecules have shown that the acid center of the material has good macromolecular accessibility. The catalyst prepared by using the material as a carrier has the remarkable characteristics of high activity and high gasoline yield. The newly developed diesel-to-catalyst cracking catalyst LPC-70 has been successfully applied in many refineries and has achieved remarkable economic benefits.
 
The successful trial production of APM-9 will complement APM-7 to further improve the conversion efficiency of heavy oil and improve the market competitiveness of China's catalytic cracking catalyst products.