The light hydrocarbons adsorption and separation from mixed gas is very important to the petroleum industry. Herein, a simple and effective strategy for preparing hierarchical porous carbons (HPCs) derived from biomass and urea with tunable pore size distribution is proposed. With the increase of urea content, the pore size distributions of HPCs become narrow, and the surface area (from 3588 to 2626 m g) and total pore volume (2.605 to 1.688 mL g) decrease. Tested at an adsorption temperature of 25 °C and a pressure of 1 bar, the resulting HPC800-0.5 has excellent CH (12.18 mmol g) and CH (6.88 mmol g) uptake capacity, while HPC800-1.5 exhibits the highest IAST-predicted CH/CH (91) and CH/CH (15) selectivity. Molecular simulations suggest that the porous structure (or more specifically micropores) has a more prominent effect on CH and CH capture at 1 bar than functional groups. The selectivity of CH/CH and CH/CH mainly depends on the narrow micropores (CH/CH, pore size ＜1.2 nm and CH/CH, pore size ＜1 nm) of carbon-based materials. This study provides insights for the further design and development of adsorbents for light hydrocarbons adsorption and separation from natural gas.

中文翻译：

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尿素辅助合成生物质基分级多孔碳用于轻质烃吸附和分离

混合气体中轻烃的吸附分离对石油工业非常重要。在此，提出了一种简单有效的策略，用于制备由生物质和尿素衍生的具有可调孔径分布的分级多孔碳（HPC）。随着尿素含量的增加，HPCs的孔径分布变窄，表面积（从3588到2626 m·g-1）和总孔容（2.605到1.688 mL·g-1）减小。在 25 °C 吸附温度和 1 bar 压力下进行测试，所得 HPC800-0.5 具有出色的 CH (12.18 mmol g) 和 CH (6.88 mmol g) 吸收能力，而 HPC800-1.5 则表现出 IAST 预测的最高 CH 吸收能力。 /CH (91) 和 CH/CH (15) 选择性。分子模拟表明，与官能团相比，多孔结构（或更具体地说是微孔）对 1 bar 下的 CH 和 CH 捕获具有更显着的影响。 CH/CH和CH/CH的选择性主要取决于碳基材料的窄微孔（CH/CH，孔径＜1.2 nm和CH/CH，孔径＜1 nm）。这项研究为进一步设计和开发用于天然气中轻质烃吸附和分离的吸附剂提供了见解。