On Continuous PFC Emission Unrelated to Anode Effects

Li, Wangxing; Zhao, Qingyun; Yang, Jianhong; Shilin, Qiu; Chen, Xiping; Marks, Jerry; Bayliss, C.R.

doi:10.1002/9781118647851.ch153

Cited by 2 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Given China's relatively small footprint in the global SC industry of 9% in 2011 [ IC Insights , ], the mismatch between China's top‐down and bottom‐up numbers most likely suggests that AL bottom‐up emissions for China remain significantly underestimated. The AL industry is currently working to better define its bottom‐up estimates of Chinese PFC emissions [ Li et al ., , , ; Marks and Bayliss , ; Chen et al ., ] and is also implementing various emission‐reducing technologies to their manufacturing processes [ Li et al ., ]. In addition, work is ongoing to better define PFC emissions during cell start‐up procedures, anode changes, and other non‐AE periods.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, work is ongoing to better define PFC emissions during cell start-up procedures, anode changes, and other non-AE periods. These effects are typically not included in the current AL industry bottom-up estimates, as they have just recently been described in the literature [Maltais et al, 2010;Li et al, 2011b;Marks and Bayliss, 2012;Chen et al, 2013], and may be particularly significant for the very large reduction cells predominantly used in China. Their inclusion should lead to better defined and subsequently reduced PFC emissions from the Chinese AL industry.…”

Section: Al Industry Emissionsmentioning

confidence: 99%

See 1 more Smart Citation

Quantifying aluminum and semiconductor industry perfluorocarbon emissions from atmospheric measurements

Kim

Fraser

et al. 2014

Geophysical Research Letters

View full text Add to dashboard Cite

The potent anthropogenic perfluorocarbon greenhouse gases tetrafluoromethane (CF 4 ) and hexafluoroethane (C 2 F 6 ) are emitted to the atmosphere mainly by the aluminum and semiconductor industries. Global emissions of these perfluorocarbons (PFCs) calculated from atmospheric measurements are significantly greater than expected from reported national and industry-based emission inventories. In this study, in situ measurements of the two PFCs in the Advanced Global Atmospheric Gases Experiment network are used to show that their emission ratio varies according to the relative regional presence of these two industries, providing an industry-specific emission "signature" to apportion the observed emissions. Our results suggest that underestimated emissions from the global semiconductor industry during 1990-2010, as well as from China's aluminum industry after 2002, account for the observed differences between emissions based on atmospheric measurements and on inventories. These differences are significant despite the large uncertainties in emissions based on the methodologies used by these industries.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Al Industry Emissionsmentioning

confidence: 99%

Quantifying aluminum and semiconductor industry perfluorocarbon emissions from atmospheric measurements

Kim

Fraser

et al. 2014

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

First-Principles Study on the Mechanism of Greenhouse Gas Generation in Aluminum Electrolysis

Sun¹,

Li²,

Zhang³

et al. 2021

Metals

View full text Add to dashboard Cite

Greenhouse gases emitted by the aluminum electrolysis industry have brought great challenges to environmental protection. To address this problem, understanding the micro-generation mechanism of greenhouse gases in the electrolysis process is of great significance to their source suppression. Based on the first principles calculation method, the formation paths of CO, CO2 and COF2 during normal electrolysis were obtained by studying the adsorption behavior of oxygen and fluorine complex anions (short for [O]2−, [F]−) on the anode surface in cryolite alumina molten salt. The calculation results indicate that the O and F atoms prefer to adsorb at bridge site 1 of Model A, with the adsorption energies of −4.82 eV and −3.33 eV. In the [O]2− priority discharge stage, Path 3 is the most likely path for CO2 generation, while in the [O]2−, [F]− co-discharge stage, Path 3 is the most likely path for COF2 generation. It is deduced that the thermal decomposition of COF2 at high temperature should account for the generation of CF4 with a low concentration of the so-called non-anode effect PFC (NAE-PFC). Experiments were also conducted to verify the calculation by disclosing the bonding information of C, O and F, which are in good accordance with the results calculated by the first principle.

show abstract

On Continuous PFC Emission Unrelated to Anode Effects

Cited by 2 publications

References 7 publications

Quantifying aluminum and semiconductor industry perfluorocarbon emissions from atmospheric measurements

Quantifying aluminum and semiconductor industry perfluorocarbon emissions from atmospheric measurements

First-Principles Study on the Mechanism of Greenhouse Gas Generation in Aluminum Electrolysis

Contact Info

Product

Resources

About