Separation of C 2 H 4 from C 2 H 4 /C 2 H 2 /C 2 H 6 mixture with high working capacity is still a challenging task. Herein, we deliberately design a Th-metal-organic framework (MOF) for highly efficient separation of C 2 H 4 from a binary C 2 H 6 /C 2 H 4 and ternary C 2 H 4 /C 2 H 2 /C 2 H 6 mixture. The synthesized MOF Azole-Th-1 shows a UiO-66-type structure with fcu topology built on a Th 6 secondary building unit and a tetrazole-based linker. Such noticeable structure, is connected by a N,O-donor ligand with high chemical stability. At 100 kPa and 298 K Azole-Th-1 performs excellent separation of C 2 H 4 (purity > 99.9%) from not only a binary C 2 H 6 / C 2 H 4 (1:9, v/v) mixture but also a ternary mixture of C 2 H 6 /C 2 H 2 /C 2 H 4 (9:1:90, v/v/v), and the corresponding working capacity can reach up to 1.13 and 1.34 mmol g −1 , respectively. The separation mechanism, as unveiled by the density functional theory calculation, is due to a stronger van der Waals interaction between ethane and the MOF skeleton.

This paper documents an increasing intergenerational income persistence in China since economic reforms were introduced in 1979. The intergenerational income elasticity increases from 0.390 for the 1970-1980 birth cohort to 0.442 for the 1981-1988 birth cohort; this increase is more evident among urban and coastal residents than rural and inland residents. We also explore how changes in intergenerational income persistence is correlated with market reforms, economic development, and policy changes.

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Obtaining highly valuable Xe from air or other sources is highly important but still seriously restricted by its inherent inert nature and the great difficulty in separation from other inert gases, especially for Xe and Kr that show comparable size. In this work, we show both experimental and theoretical research of how to boost the selective adsorption of Xe over Kr by double-accessible open-metal site in metal–organic framework (MOF). The MOF, namely, UTSA-74, shows a high Xe uptake up to 2.7 mmol/g and a lower Kr uptake of 0.58 mmol/g at 298 K and 1 bar, leading to a high selectivity of 8.4. The effective Xe/Kr separation was further confirmed by both transient breakthrough simulation and experimental breakthrough. The separation mechanism, as unveiled by the grand canonical Monte Carlo simulation and dispersion-corrected density functional theory calculation, is due to the unique double-accessible open-metal site in UTSA-74 that affords stronger interaction toward Xe than Kr.