反应条件对NiMo2C催化甲烷二氧化碳重整反应途径的影响
Influence of Reaction Conditions on Pathways of Methane and Carbon Dioxide Reforming over NiMo2C Catalyst
师晓峰 1刘国刚 2费伯成 2么志伟1
作者信息
- 1. 辽宁石油化工大学,辽宁 抚顺 113001
- 2. 中国石油抚顺石化公司,辽宁 抚顺 113004
- 折叠
摘要
Ni/Mo2C催化甲烷二氧化碳重整反应途径包括贵金属机理和氧化-碳化循环机理,由于在较高温度下后者通常为主要反应途径而引起极大的关注.反应条件对氧化-碳化循环机理有重要影响.通过改变反应气组成和空速可获得 2 种循环途径:(Ⅰ)Mo2C→MoO2→Mo2C,即Mo2C先被CO2 氧化成MoO2,然后MoO2 被CH4 碳化生成Mo2C;(Ⅱ)Mo2C→MoO2→Mo→Mo2C,即 Mo2C先被二氧化碳氧化生成MoO2,然后MoO2 与CH4 解离出的H物种发生还原反应生成金属Mo和H2O,然后金属Mo再与甲烷解离出的C物种作用生成Mo2C.循环途径对催化剂稳定性有很大影响,其中循环途径Ⅱ对催化剂的稳定性更有利.
Abstract
The catalytic pathways of Ni/Mo2C in methane and carbon dioxide reforming reaction involve both noble metal mechanism and oxidation-carburization cycle,with the latter usually being the predominant pathway at higher temperatures,attracting significant attention.Reaction conditions exert significant influence on the oxidation-carburization cycle mechanism.Two cyclic pathways can be obtained by varying the reactant gas composition and space velocity:(Ⅰ)Mo2C→MoO2→Mo2C,wherein Mo2C is initially oxidized to MoO2 by CO2,followed by the carbonization of MoO2 by CH4 to regenerate Mo2C;(Ⅱ)Mo2C→MoO2→Mo→Mo2C,wherein Mo2C is first oxidized to MoO2 by carbon dioxide,then MoO2 undergoes reduction with the H species dissociated from CH4 to produce metallic Mo and H2O,subsequently,metallic Mo interacts with the carbon species dissociated from methane to form Mo2C.The cyclic pathways have a significant impact on catalyst stability,with cycle Ⅱ being more favorable for catalyst stability.
关键词
甲烷/二氧化碳/重整/镍/碳化钼Key words
Methane/Carbon dioxide/Reforming/Nickel/molybdenum carbide引用本文复制引用
出版年
2024
NETL
NSTL
万方数据