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Separation of CO2/C2H2 to obtain pure C2H2 presents a challenge for the chemical industry. CO2‐selective adsorbents are favored because of the convenient separation process. However, there are only a few CO2‐selective adsorbents that can effectively isolate CO2 from CO2/C2H2, and there is almost no research on CO2/C2H2 separation under harsh conditions, such as with high temperatures and humidities. Herein, a zeolitic octahedral metal oxide based on ϵ‐Keggin polyoxometalates is utilized for separations of CO2/C2H2 at high temperatures and humidities. Single gas adsorption measurements show that the material only adsorbs CO2 with almost no C2H2 taken up. Dynamic competitive adsorption experiments show that the material efficiently separates CO2/C2H2, and highly pure C2H2 is obtained directly. The robust material maintains a high separation performance at 333 K with 18.12 % water. The high stability of the material enables reuse without loss of separation performance. [ABSTRACT FROM AUTHOR]

Separation of CO 2 /C 2 H 2 to obtain pure C 2 H 2 presents a challenge for the chemical industry. CO 2 -selective adsorbents are favored because of the convenient separation process. However, there are only a few CO 2 -selective adsorbents that can effectively isolate CO 2 from CO 2 /C 2 H 2 , and there is almost no research on CO 2 /C 2 H 2 separation under harsh conditions, such as with high temperatures and humidities. Herein, a zeolitic octahedral metal oxide based on ϵ-Keggin polyoxometalates is utilized for separations of CO 2 /C 2 H 2 at high temperatures and humidities. Single gas adsorption measurements show that the material only adsorbs CO 2 with almost no C 2 H 2 taken up. Dynamic competitive adsorption experiments show that the material efficiently separates CO 2 /C 2 H 2 , and highly pure C 2 H 2 is obtained directly. The robust material maintains a high separation performance at 333 K with 18.12 % water. The high stability of the material enables reuse without loss of separation performance., (© 2022 Wiley-VCH GmbH.)

A Ti 3 (Al x Cu 1- x )C 2 phase with Cu atoms with a degree of ordering in the A plane is synthesized through the A site replacement reaction in CuCl 2 molten salt. The weakly bonded single-atom-thick Cu layers in a Ti 3 (Al x Cu 1- x )C 2 MAX phase provide actives sites for catalysis chemistry. As-synthesized Ti 3 (Al x Cu 1- x )C 2 presents unusual peroxidase-like catalytic activity similar to that of natural enzymes. A fabricated Ti 3 (Al x Cu 1- x )C 2 /chitosan/glassy carbon electrode biosensor prototype also exhibits a low detection limit in the electrochemical sensing of H 2 O 2 . These results have broad implications for property tailoring in a nanolaminated MAX phase by replacing the A site with late transition elements.