In situ modification of heavy oil catalyzed by nanosized metal-organic framework at mild temperature and its mechanism  

作　　者：Li Wang Ji-Xiang Guo Rui-Ying Xiong Chen-Hao Gao Xiao-Jun Zhang Dan Luo 

机构地区：[1]The Unconventional Oil and Gas Institute,China University of Petroleum-Beijing,Beijing 102200,China [2]Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Sciences,Beijing 101400,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第3期166-173,共8页中国化学工程学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(52174047);Sinopec Project(P21063-3).

摘　　要：Two catalysts, nano-sized cobalt-metal-organic framework(Co-MOF) and nickel(Ni)-MOF, were successfully prepared by the modification method. Tetralin(C10H12) was used as the hydrogen donor for the catalytic cracking and hydrogenation modification study of the dehydrated crude oil from the Shengli Oilfield. The optimal reaction conditions were determined through orthogonal experiments, and the components of the crude oil and modified oil samples were analyzed. The results revealed that the nanoMOF catalysts were successfully prepared and exhibited high catalytic activity. They could catalyze the cracking of large molecules in heavy oil at mild temperatures(<300°C), leading to the decomposition of the hydrogen donor. When the mass fraction of the catalyst was 0.2%, the mass fraction of the hydrogen donor was 1%, and the reaction temperature was 280°C, the Ni-MOF showed the best catalytic viscosity reduction effect. It could reduce the viscosity of heavy oil at 50°C from 15761.9 m Pa.s to 1266.2 m Pa.s,with a viscosity reduction rate of 91.97%. The modification effect of Co-MOF was the next best, which could reduce the viscosity of heavy oil to 2500.1 m Pa.s with a viscosity reduction rate of 84.14%. Molecular dynamics simulations revealed a strong interaction force between the MOF surface and asphaltene molecules. In the process of heavy-oil catalytic hydrogenation, the nano-MOF catalyst exhibited high catalytic activity. On the one hand, the empty d orbitals outside the metal atoms in the catalyst could polarize the carbon atoms in the organic matter, accelerating the breaking of long chains. On the other hand, the metal atoms in the catalyst could bond with the carbon σ bonds, breaking the carbon-carbon bonds. This disrupted the structure of the recombined components in the crude oil, irreversibly reducing the viscosity of the heavy oil and improving its fluidity.

关 键 词：Nano-sized MOF Petroleum Viscosity reduction Catalyst NANOMATERIALS 

分 类 号：TE624.9[石油与天然气工程—油气加工工程] TB383.1[一般工业技术—材料科学与工程]