Nano-sized carbon hollow spheres for abatement of ethylene

Abstract

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.

Spent tea leaves: A new non-conventional and low-cost biosorbent for ethylene removal

“…Moreover, FTIR spectral analysis of the regenerated MSTLP revealed that it had the same chemical nature as did MSTLP. Table 3 presents the comparative ethylene adsorption capacities of MSTLP and of some other economical adsorbents as obtained from a literature review (Wu et al, 1997;Wills and Warton, 2004;Kima et al, 2005;Liu et al, 2006;Albunia et al, 2008). Generally, zeolites and carbon-based materials are used as absorbents for the removal of ethylene.…”

“…However, chemical scrubbers have a major drawback in that they are costly in terms of their maintenance and replacement of chemical agents (Reddy et al, 2012;Zhao et al, 2012). To lower operation costs, a bioscrubber was introduced in the last two decades for pollutant removal without regeneration of a chemical agent (Kim, 2006;Liu et al, 2006;Arantes et al, 2009;Fu et al, 2011;Kazmierczak et al, 2013;Soltani et al, 2013;Xiong et al, 2013;Yu et al, 2013;Zolgharnein et al, 2013;Chand et al, 2014). Development of new valuable adsorbent using environmental-friendly materials is most desirable.…”

The electrical transport properties of nitrogen doped carbon microspheres

“…CSs acting as supports for lead nanoparticles have been used to slow down the ripening of fruits and vegetables in storage via the removal of ethylene [56]. Carbon blacks have also been shown to extract the organic pollutants from water [1].…”

Synthesis of Functionalized Bisarylacetylene Derivatives from Acetylene Gas Over Nano-sized Carbon Ball Supported Palladium Catalyst

“…16 Due to the large surface area and pore volume, these materials make excellent substrates for adsorption-based applications. 17 However, the chemical inertness of NCBs limits their utilization in other potential applications such as those involving bioactive compounds and homogeneous catalysts.…”