CO2 capture by double metal modified CaO-based sorbents from pyrolysis gases

doi:10.1016/j.cjche.2021.09.002

Abstract

Abstract: High-temperature pyrolysis technology can effectively solve the problem of municipal solid waste pollution. However, the pyrolysis gas contains a large amount of CO₂, which would adversely affect the subsequent utilization. To address this problem, a novel method of co-precipitation modification with Ca, Mg and Zr metals was proposed to improve the CO₂ capture performance. X-ray diffraction (XRD) patterns and energy dispersive X-ray spectroscopy analysis showed that the two inert supports MgO and CaZrO₃ were uniformly distributed in the modified calcium-based sorbents. In addition, the XRD results indicated that CaZrO₃ was produced by the reaction of ZrO₂ and CaO at high temperatures. The effects of doping ratios, adsorption temperature, calcination temperature, CO₂ concentration and calcination atmosphere on the adsorption capacity and cycle stability of the modified calcium-based sorbent were studied. The modified calcium-based sorbent achieved the best CO₂ capture performance when the doping ratio was 10:1:1 with carbonation at 700 ℃ under 20% CO₂/80% N₂ atmosphere and calcination at 900 ℃ under 100% N₂ atmosphere. After ten cycles, the average carbonation conversion rate of Ca-10 sorbent was 72%. Finally, the modified calcium-based sorbents successfully reduced the CO₂ concentration of the pyrolysis gas from 37% to 5%.

Key words: Pyrolysis gas, CO₂ capture, Co-precipitation, CaO-based sorbents, Modified sorbents

摘要： High-temperature pyrolysis technology can effectively solve the problem of municipal solid waste pollution. However, the pyrolysis gas contains a large amount of CO₂, which would adversely affect the subsequent utilization. To address this problem, a novel method of co-precipitation modification with Ca, Mg and Zr metals was proposed to improve the CO₂ capture performance. X-ray diffraction (XRD) patterns and energy dispersive X-ray spectroscopy analysis showed that the two inert supports MgO and CaZrO₃ were uniformly distributed in the modified calcium-based sorbents. In addition, the XRD results indicated that CaZrO₃ was produced by the reaction of ZrO₂ and CaO at high temperatures. The effects of doping ratios, adsorption temperature, calcination temperature, CO₂ concentration and calcination atmosphere on the adsorption capacity and cycle stability of the modified calcium-based sorbent were studied. The modified calcium-based sorbent achieved the best CO₂ capture performance when the doping ratio was 10:1:1 with carbonation at 700 ℃ under 20% CO₂/80% N₂ atmosphere and calcination at 900 ℃ under 100% N₂ atmosphere. After ten cycles, the average carbonation conversion rate of Ca-10 sorbent was 72%. Finally, the modified calcium-based sorbents successfully reduced the CO₂ concentration of the pyrolysis gas from 37% to 5%.

关键词: Pyrolysis gas, CO₂ capture, Co-precipitation, CaO-based sorbents, Modified sorbents

Xiaobin Chen, Yuting Tang, Chuncheng Ke, Chaoyue Zhang, Sichun Ding, Xiaoqian Ma. CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases[J]. Chinese Journal of Chemical Engineering, 2022, 43(3): 40-49.

Xiaobin Chen, Yuting Tang, Chuncheng Ke, Chaoyue Zhang, Sichun Ding, Xiaoqian Ma. CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases[J]. 中国化学工程学报, 2022, 43(3): 40-49.

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CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases

CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases

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