Efficient nickel‐based catalysts for amine regeneration of CO 2 capture: From experimental to calculations verifications

作者：Qiang Sun, Hongxia Gao, Yu Mao, Teerawat Sema, Sen Liu, Zhiwu Liang · 发表于：AIChE Journal · 年份：2022 · DOI：10.1002/aic.17706 · 被引用次数：38 · 研究领域：Carbon Dioxide Capture Technologies、Membrane Separation and Gas Transport、Carbon dioxide utilization in catalysis

Abstract High heat duty is an urgent challenge for industrial applications of amine‐based CO 2 capture. The temperature (>110°C) of carbamate breakdown in amine regeneration requires large energy consumption. In this work, we report a novel, stable, efficient, and inexpensive Ni‐HZSM‐5 catalyst to improve the CO 2 desorption rate and reduce the heat duty. The impregnation method was applied for varying nickel content in the catalysts from 2.16 to 9.80 wt% in HZSM‐5. The catalysts were characterized by scanning electron microscope, X‐ray powder diffraction, N 2 adsorption–desorption, inductively coupled plasma‐optical emission spectrometry, ultraviolet‐visible diffuse reflectance spectroscopy, X‐ray photoelectron spectroscopy, NH 3 ‐temperature programmed desorption (TPD), Infrared spectroscopy of pyridine adsorption, and Fourier transform infrared spectroscopy. The catalytic performance was evaluated by CO 2 desorption of rich amine solvent at 90°C. It was found that the introduction of nickel increased the acid sites of catalysts compared with parent HZSM‐5. This phenomenon plays a key role on improving the CO 2 desorption rate. The density functional theory (DFT) calculations successfully explain the catalytic performance. The catalytic activity associates with the combined properties of MSA × B/L × Ni 2+ . The 7.85‐Ni‐HZ catalyst presents an excellent catalytic activity for the CO 2 desorption: it increases the amount of desorbed CO 2 up to 36%, reduces the relative hea...