Efficient Removal of Sulfur Hexafluoride (SF₆) Through Reacting with Recycled Electroplating Sludge

Abstract

This paper reports that recycled electroplating sludge is able to efficiently remove greenhouse gas sulfur hexafluoride (SF6). The removal process involves various reactions of SF6 with the recycled sludge. Remarkably, the sludge completely removed SF6 at a capacity of 1.10 mmol/g (SF6/sludge) at 600 °C. More importantly, the evolved gases were SO2, SiF4, and a limited amount of HF, with no toxic SOF4, SO2F2, or SF4 being detected. These generated gases can be readily captured and removed by NaOH solution. The reacted solids were further found to be various metal fluorides, thus revealing that SF6 removal takes place by reacting with various metal oxides and silicate in the sludge. Moreover, the kinetic investigation revealed that the SF6 reaction with the sludge is a first-order chemically controlled process. This research thus demonstrates that the waste electroplating sludge can be potentially used as an effective removal agent for one of the notorious greenhouse gases, SF6.

Zeolites for the selective adsorption of sulfur hexafluoride

“…It is mainly used in the electrical industry as insulating gas for transmission and distribution of electrical energy. 5,6 From the environmental point of view sulfur hexafluoride is an efficient infrared absorber and a potent greenhouse gas with a global warming power about 23 900 times larger than this of CO 2 . 4 As a result of its different uses, the global concentration of this gas has increased from less than 1 ppt in 1975 to about 7-8 ppt nowadays.…”

Efficient Selective Catalytic Reduction of NO by Novel Carbon-doped Metal Catalysts Made from Electroplating Sludge

“…In our previous report, we found that pyrolyzed electroplating sludge, a mixture of various metals/ metal oxides and carbons, decomposed the greenhouse gas SF 6 effectively. 9 It seems that there is no research on recycling electroplating sludge as the catalyst for NO x removal. NO x could be effectively removed by selective catalytic reduction (SCR) with metal catalyst using NH 3 , H 2 and hydrocarbon as reducing agent.…”

Reverse Logistics Network Design for SF6 in Chinese Electric Power Corporations

“…Then, program calculation is conducted on the model by LINGO 12.0 software. 1 is 15594210 and 2 is 0.873.…”

“…Zhou, Q. Liu, G. Qian, and Z.P. Xu demonstrated that the waste electroplating sludge can be potentially used as an effective removal agent for SF 6 [1] . I. Matito J. Alvarez J. Gutierrez, M. Doblare, A. Martin, and S. Calero stated that zeolites BEC, ITR, IWW, and SFG are regarded as the most promising materials for a nitrogen-sulfur hexafluoride mixture separation [2] .…”