Chen Feifei, Wang Qin, Zhang Linzhou, Zhu Qiushi
Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, Huaibei Normal University, Huaibei, Anhui235000, P. R. China.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing102249, China.
ACS Omega. 2022 Oct 19;7(43):39078-39089. doi: 10.1021/acsomega.2c04811. eCollection 2022 Nov 1.
The interaction between functionalized graphene and metal porphyrins was studied for a better understanding of the influence of the N and O heteroatoms in asphaltene on demetallization efficiency during the solvent deasphalting process. The theoretical simulation indicated a strong inhibitory effect of the aminated/carboxylated side group for chemical adsorption of metal porphyrins. The differences of adsorption behavior for graphene, aminated graphene, and Canadian oil sands bitumen vacuum tower bottom asphaltene (VTB-asp) were also analyzed. It was found that the introduction of aminated side groups to the graphene not only compromised the electron delocalization capacity of the polyaromatic nuclei hydrocarbon skeleton of graphene but also caused a steric hindrance effect on the internal diffusion of metal porphyrins, leading to decreased adsorption active sites and internal diffusion rate, respectively. It was also found that metal porphyrins can be barely adsorbed on carboxylated graphene at 25 °C.
为了更好地理解溶剂脱沥青过程中沥青质中氮和氧杂原子对脱金属效率的影响,研究了功能化石墨烯与金属卟啉之间的相互作用。理论模拟表明,胺化/羧化侧基对金属卟啉的化学吸附具有强烈的抑制作用。还分析了石墨烯、胺化石墨烯和加拿大油砂沥青真空塔底油沥青质(VTB-asp)吸附行为的差异。研究发现,在石墨烯中引入胺化侧基不仅损害了石墨烯多环核烃骨架的电子离域能力,而且对金属卟啉的内部扩散产生空间位阻效应,分别导致吸附活性位点和内部扩散速率降低。还发现,在25℃下,金属卟啉几乎不能吸附在羧化石墨烯上。