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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Perfluorocarbon Generation and Emissions from Industrial Processes
Presentation Title Attributing PFC Emissions to Different Industries: How Bottom-up Trends Can Complicate Top-down Analyses
Author(s) Deborah Ottinger, Stephanie Bogle
On-Site Speaker (Planned) Deborah Ottinger
Abstract Scope Efforts to reconcile the PFC emissions inferred from atmospheric measurements and those reported using inventory methods have focused on electronics manufacturing and aluminum production. These efforts have sometimes relied on characteristic ratios of CF4 and C2F6 emissions from each industry. Previous research has attributed changes in the C2F6/CF4 ratio in inferred emissions to changes in the share of total PFC emissions contributed by each industry. However, the continuing replacement of C2F6 with NF3 in the electronics industry is currently changing the typical C2F6/CF4 ratio in that industry, complicating attribution efforts. The authors will show that the C2F6/CF4 ratio in emissions reported to the USEPA by semiconductor manufacturers has declined significantly over the past 15 years. The authors will also show similar trends in the PFC emissions reported by countries that are major electronics manufacturers. This demonstrates that understanding industry-specific emissions trends is necessary to correctly interpret atmospheric trends.
Proceedings Inclusion? Planned: Light Metals


An Estimation of PFC Emission by Rare Earth Electrolysis
Attributing PFC Emissions to Different Industries: How Bottom-up Trends Can Complicate Top-down Analyses
Challenges in Estimating Global CF4 and C2F6 Emissions
Conditions and Mechanisms of Gas Emissions from Didymium Electrolysis and Its Process Control
Evaluation of Time Consistency when Quantifying Emissions of Perfluorocarbons Resulting from Low Voltage Anode Effects
Fluorinated Gas Production: Underestimated Source of PFCs?
Low Voltage PFC Measurements and Potential Alternative to Reduce Them at Alcoa Smelters
Methodologies to Measure Greenhouse Gas (GHG) Emissions from Industrial Processes and Determine the GHG Emission Factors
New Algorithm for Calculating CF4 Emissions from High Voltage Anode Effects
New Approach for Quantification of Perfluorocarbons Resulting from High Voltage Anode Effects
Perfluorocarbon Formation during Rare Earth Electrolysis
PFC Emission Reduction in the Semiconductor Industry
PFC Evolution Characteristics during Aluminium and Rare Earth Electrolysis
PFCs from the Chinese Aluminium Sector – Challenges in Emissions Accounting and Further Characteristics
Updated Factors for Calculating PFC Emissions from Primary Aluminum Production
Validation of Online Monitoring of PFC by QCL with FTIR Spectroscopy

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