Amine-functionalized nano-Al2O3 adsorbent for CO2 separation from biogas: Efficient CO2 uptake and high anti-urea stability

Shen，Xuehua1,2; Yan，Feng2,3; Li，Chunyan2; Qu，Fan2; Wang，Pengju2; Zhao，Shiyin2; Zhang，Zuotai2,3

2022-01-15

10.1016/j.jclepro.2021.130078

Journal of Cleaner Production   影响因子和分区

0959-6526

1879-1786

Amine-functionalized adsorbents have become a hot topic in research on CO separation from biogas. However, developing superior adsorbents with high adsorption capacity and stable cyclic stability under a CO regeneration atmosphere remains difficult. In this study, azeotropic distillation, a green, recyclable method, was used to expand the pores of the nano-AlO support. The pore volume of pore-expanded nano-AlO reached 1.62 cm g, and the derived amine-functionalized nano-AlO adsorbent (‘60%PEI@AD-AlO’) possessed a superior CO uptake of 199.4 mg·g with rapid adsorption kinetics. ‘60%PEI@AD-AlO’ showed favourable cyclic stability under CO regeneration atmosphere with a final CO uptake of 133.8 mg·g after 50 cycles, which possessed a competitive CO uptake compared with the reported amine-functionalized adsorbents with anti-urea stability. This superior performance is attributed to the large pore volume of the pore-expanded nano-AlO support and the anti-urea stability for ‘60%PEI@AD-AlO’, which does not require active amine modification and avoids diluting the active amine content. Furthermore, the effect of water vapour in biogas on adsorption performance was studied. Water vapour could significantly promote CO adsorption at low temperatures (<90 °C), and it was accompanied by strong water vapour adsorption, which would potentially increase the regeneration energy consumption. Additionally, water vapour could effectively inhibit the formation of urea compounds, further improving the cyclic stability. Because of the facile, scalable preparation method, the synthesised amine-functionalized nano-AlO adsorbent has broad application prospects for CO separation.

Amine-functionalized adsorbent Anti-urea stability Azeotropic distillation CO2 adsorption capacity Cyclic stability Pore-expanded nano-Al2O3

SCI ; EI

英语

通讯

Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology

Green & Sustainable Science & Technology ; Engineering, Environmental ; Environmental Sciences

WOS:000791357800005

ELSEVIER SCI LTD

20215111365788

Alumina ; Aluminum oxide ; Biogas ; Distillation ; Energy utilization ; Gas adsorption ; Metabolism ; Stability ; Urea ; Water vapor

Gas Fuels:522 ; Energy Utilization:525.3 ; Chemical Operations:802.3 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Agricultural Wastes:821.5

2-s2.0-85121382835

Scopus

1.School of Environment,Harbin Institute of Technology,Harbin,150090,China
2.School of Environmental Science and Engineering,Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,Southern University of Science and Technology,Shenzhen,518055,China
3.Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City,Shenzhen,518055,China

Shen，Xuehua,Yan，Feng,Li，Chunyan,et al. Amine-functionalized nano-Al2O3 adsorbent for CO2 separation from biogas: Efficient CO2 uptake and high anti-urea stability[J]. Journal of Cleaner Production,2022,332.

Shen，Xuehua.,Yan，Feng.,Li，Chunyan.,Qu，Fan.,Wang，Pengju.,...&Zhang，Zuotai.(2022).Amine-functionalized nano-Al2O3 adsorbent for CO2 separation from biogas: Efficient CO2 uptake and high anti-urea stability.Journal of Cleaner Production,332.

Shen，Xuehua,et al."Amine-functionalized nano-Al2O3 adsorbent for CO2 separation from biogas: Efficient CO2 uptake and high anti-urea stability".Journal of Cleaner Production 332(2022).