Preparation Of Meso-SAPO-11and Its Application In Isomerization Of Coking Gas Oil

As the crude oil becoming of poor quality, efficient utilization of heavy oil is of greatimportance. Coking Gas Oil (CGO), produced by Delayed Coking Process, becomes crucialsource for Fluid Catalytic Craking (FCC), and the key problem for it is the furtherdevelopment of the light oil yield and better quality of the products. Adding molecule sievesas assistants in FCC catalysts would improve the cracking process of long-chain paraffin anddevelop the octane number in gasoline product. SAPO-11molecule sieve as the classicalcatalyst for isomerization, would usually be stucked by its micropores for long-chain paraffin.Therefore, induced with mesopores in microporous SAPO-11can increase the speed of masstransfer, enhance the isomerization process, and produce more gasoline with high quality inFCC. Herein, we report the successful preparation of meso-SAPO-11by several methods,evaluate their catalytic performance for isomerization, and then apply the catalysts in FCC ofCGO.Meso-SAPO-11was prepared by soft template method, hard template method and acidtreatment method. With glucose as soft template, meso-SAPO-11with high crystallizationand mesoporous volume was synthesized by controlling the addition of template andcrystallization temperature, and the mesopores were constructed by the carbonization ofglucose. With carbon nanoparticles as hard template, meso-SAPO-11was synthesized bycontrolling the addition of template and the particle size, and the mesopores were constructedas intracrystal. HCl and citric acid were employed for the synthesis of meso-SAPO-11by acidtreatment, and the treatment conditions were optimized separately. Meso-SAPO-11catalystsloaded of0.5%Pt were evaluated for n-C12isomeriztion, and the composite treated by CAwas selected as the best catalysts with high isomerization yield. With CA-SAPO-11added inFCC catalysts, the products cracked from AGO and CGO were analyzed for evaluation. With meso-SAPO-11as assistant added in FCC catalysts, the FCC gasoline product yield increased,and the isomers in gasoline also developed.The characterization methods used in the experiment are XRD, FT-IR, SEM, TEM andN2adsorption-desorption.