Catalytic ability of MgO to break C—H bonds during slurry oil carbon deposition--颗粒学报PARTICUOLOGY

Ning, G., Huang, X., Li, J., Wang, T., Sun, Y., & Yu, Y. (2018). Catalytic ability of MgO to break CH bonds during slurry oil carbon deposition. Particuology, 38, 222-227. https://doi.org/10.1016/j.partic.2017.11.002

Catalytic ability of MgO to break C—H bonds during slurry oil carbon deposition

Guoqing Ning ^a *, Xiaoqiao Huang ^{b c}, Jianwei Li ^a, Tingfu Wang ^a, Yuzhen Sun ^a^d, Yintao Yu ^a

a State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
b State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
c Petrochina Fuel Oil Company Limited Research Institute, Beijing 100195, China
d School of Chemistry and Chemical Engineering, Yancheng Teachers University, Yancheng, Jiangsu 224051, China

10.1016/j.partic.2017.11.002

Volume 38, June 2018, Pages 222-227

Received 31 July 2017, Revised 1 November 2017, Accepted 12 November 2017, Available online 2 March 2018, Version of Record 2 April 2018.

E-mail: ngq@cup.edu.cn; ninggq@qq.com

Highlights

• Carbonization and 900 °C heat treatment of slurry oil/MgO composites were investigated.

• Results showed that MgO promoted the breakage of C—H bonds during the carbonization.

• Heat treatment of carbonized composites enhanced the electrode performance of the porous carbon.

Abstract

Although MgO has been widely used for the MgO-templated synthesis of carbon materials, little attention has been paid to MgO's catalytic function during carbon deposition. Here, a systematic analysis of the products of slurry oil (SO) carbonization with and without MgO templates present indicates that MgO catalytically promoted the breakage of C—H bonds by immobilizing heavy oil molecules on MgO surfaces and the attractive interaction between hydrogen and MgO. Compared with the carbonization of SO alone, a notably higher H₂ concentration and a lower hydrocarbon concentration was observed in the tail gas, a higher solid yield and a lower degree of graphitization of the carbon product were observed when MgO was also present. Furthermore, treatment at 900 °C in the presence of MgO efficiently enhanced the capacitance and rate capability of the as-obtained porous carbon when tested as an electrode material for supercapacitors. These results suggest that the catalytic function of MgO could exist in all MgO-templated syntheses and in the heat treatment of porous carbons and graphene.

Graphical abstract

Keywords

Carbonization; Slurry oil; Magnesium oxide; Catalytic function

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