Green preparation of CaO-based CO adsorbent by calcium-induced hydrogenation of shell wastes at room/moderate temperature.

Capturing CO using clamshell/eggshell-derived CaO adsorbent can not only reduce carbon emissions but also alleviate the impact of trash on the environment. However, organic acid was usually used, high-temperature calcination was often performed, and CO was inevitably released during preparing CaO adsorbents from shell wastes. In this work, CaO-based CO adsorbent was greenly prepared by calcium-induced hydrogenation of clamshell and eggshell wastes in one pot at room/moderate temperature.

One-pot preparation of H-mixed CH fuel and CaO-based CO sorbent by the hydrogenation of waste clamshell/eggshell at room temperature.

The preparation of clean fuel or CO adsorbents using industrial and domestic garbage is an alternative way of meeting global energy needs and alleviating environmental problems. Herein, H-mixed CH fuel and CaO-based CO sorbent were first prepared in one pot by the mechanochemical reaction of pretreated clamshell or eggshell wastes (carbon and calcium source) with calcium hydride (hydrogen source) at room temperature. In the above reactions, CH was the sole hydrocarbon product, and its yield reached 78.