In this paper, the ethylene adsorption capacities of the nano-sized carbon hollow spheres (CNB) and active carbon (AC), the
Pd (PdCl
2) impregnated CNB or AC (Pd/CNB, Pd/AC) and heat treatment under various conditions, were studied at different ethylene concentrations
from 64 to 1060 ppm. The results indicated that AC had a good ethylene adsorption capacity at high ethylene concentration.
Pd impregnation decreased the ethylene adsorption capacity of AC. Heat treatment and H
2 activation could increase the ethylene adsorption capacity, but also lowered than AC itself. CNB had lower ethylene adsorption
capacity than AC, but heat treatment and H
2 activation could increase its ethylene adsorption capacity markedly. With activating condition from heat treatment in N
2 at 300 °C to activation in H
2/N
2 at 100 °C, to activation in H
2 at 200 °C, and to activation in H
2 at 300 °C, the ethylene adsorption capacity of Pd/CNB was increased regularly. At low ethylene concentration, viz., 64 ppm,
the ethylene adsorption quantities (
q
a) by Pd/CNB activated in H
2 at 200 or 300 °C were higher than any other adsorbents. So, activated in H
2 atmosphere at higher than 100 °C, Pd/CNB is particularly advantaged for adsorbing low concentration of ethylene. Amongst
all the adsorbents used, Pd/CNB activated in H
2 atmosphere at 300 °C for 2 h has the highest ethylene adsorption capacity at lower concentration than 125 ppm. In addition,
all the CNB, Pd/CNB, AC, and Pd/AC samples can be easily regenerated in airflow for more than 3 h.
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