甲烷化
沸石
催化作用
化学工程
吸附
替代天然气
材料科学
解吸
化学
吉布斯自由能
透射电子显微镜
物理化学
合成气
纳米技术
有机化学
热力学
工程类
物理
作者
Ijaz Hussain,Aishah Abdul Jalil,S.M. Izan,Kamarizan Kidam,Nurul Ainirazali,Adnan Ripin
标识
DOI:10.1016/j.ces.2020.116015
摘要
CO2 methanation is a novel way for climate change mitigation by converting CO2 into substitute natural gas. In this study, a highly active fibrous silica-beta zeolite ([email protected]2-BEA) catalyst was prepared for CO2 methanation by a microemulsion process, and examined by N2 adsorption–desorption, field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), and electron spin resonance (ESR) spectroscopy techniques. It was found that the [email protected]2-BEA catalyst possessed a fibrous silica morphology, leading to high surface area (609 m2/g), oxygen vacancies, and basicity. A thermodynamic study was also carried out using Gibbs free energy minimization method, and it was found that low temperatures (25–350 °C) and high H2: CO2 ≥ 4 ratios have enhanced the CO2 methanation activity. The prepared [email protected]2-BEA catalyst exhibited high CO2 conversion (65%), and CH4 selectivity (61%) with a space–time yield of 3.30 g gcat−1 h−1. The obtained experimental results highly followed the thermodynamic calculations.
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