Removal of SO₂ from Flue Gas on a Copper-Modified Activated Coke Prepared by a Novel One-Step Carbonization Activation Blending Method

Abstract

A copper-modified activated coke (AC-Cu) was prepared through a developed one-step carbonization-activation blending (OCAB) method in which activation (900 °C) occurred just behind carbonization (600 °C) without cooling and was used in flue-gas desulfurization. Compared with the two-step carbonization-activation blending (TCAB) method, the OCAB method was simplified, and the AC-Cu sulfur capacity improved from 137.0 mg/g (TCAB) to 219.2 mg/g (OCAB). This result can be ascribed to the improvement in the specific surface area and micropore volume of AC-Cu, as well as the increased concentration of CO and OCOH on the surface, since CO can provide an electron-rich surface for electron transfer and since OCOH can form hydrogen bonds with water to facilitate SO2 removal. Remarkably, the specific surface area and surface concentration of CO and OCOH on AC-Cu (OCAB) were all higher than those of Cu/AC (TCAB). All these findings indicated the potential of AC-Cu as a promising efficient material for industrial desulfurization.

Mechanistic and Experimental Study of the CuxO@C Nanocomposite Derived from Cu3(BTC)2 for SO2 Removal

“…Furthermore, a comparison of the desulfurization performance of CuO−NC at 200 • C in the presence and absence of O 2 (6 vol.%) and H 2 O(g) (6 vol.%) is shown in Figure 7c. The results revealed that both of S/Cu and SO 2 capacity significantly increased in the presence of O 2 , which can be explained by the oxidation of SO 2 and the formation process of sulfates (SO 2 + 1 2 O 2 → SO 3 ; SO 3 + CuO → CuSO 4 ) [18,58]. This process reconfirmed the adsorption mechanism of SO 2 molecules on the oxygen vacancy CuO (111) surface (Figure 6).…”

“…On the one hand, Cu + was rapidly oxidized to Cu 2+ , which narrowed the differentials of SO 2 removal performance, resulting from the chemical compositions, between the CuO−NC and CuO−NP. On the other hand, the CuO and SO 2 converted to CuSO 4 faster, which may cause the deactivation of desulfurizer due to the covering by rapidly formed sulfates [58]. Furthermore, a comparison of the desulfurization performance of CuO−NC at 200 • C in the presence and absence of O 2 (6 vol.%) and H 2 O(g) (6 vol.%) is shown in Figure 7c.…”

Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

“…The use of activated coke (AC)-based catalyst, in particular, has good potential for industrial application due to its relatively low cost and excellent adaptability 12 . To improve the reaction activity, integration of AC with transition metals has been studied 13 , 14 , and some of them observed good NH 3 -SCR performance 14 – 16 . However, most of the AC-based catalysts were prepared by the impregnation method, and this method can use only soluble transition metal salts with a relatively low decomposition temperature as precursor 12 , 17 .…”

“…To simplify the preparation and reduce costs, the blending method that integrates AC preparation and catalyzation modification in one step extend the applicability of the catalyst precursor to catch great attention in the past few years. Jiang had prepared the metal oxide-blended activated carbon from walnut shells for flue gas desulfurization 18 , as well as the coal-based AC 13,19 , and the recent work observed clear improvement of SCR activity of the blending-modified AC 20 . However, studies on the SCR application of the blending-modified AC is still in its infancy.…”

Adverse Effects of Inherent CaO in Coconut Shell-Derived Activated Carbon on Its Performance during Flue Gas Desulfurization

“…Therefore, the efficient and economic removal of SO 2 in the flue gas produced by coal-fired power plants has been strictly regulated in most countries. A variety of flue gas desulfurization (FGD) technologies have been used commercially in coal-fired power plants, including wet FGD scrubbers (e.g., Ca-based FGD, Mg-based scrubber, dual-alkali system, seawater method, and ammonia scrubber) − and dry FGD technologies using solid sorbents [e.g., activated carbon (AC) system, fly ash, lime-based sorbents, spray dryer absorber (SDA), and circulating fluidized-bed FGD]. − The current commercial wet FGD technologies suffer from the shortcomings of high investment costs, high water consumption and generation of solid wastes, and so forth. , Therefore, dry FGD technologies have been regarded as viable alternatives with various advantages, including lower investment and operation costs and minimal wastewater treatment requirements. − …”