Nitrogen oxides (NOx) in urban air close to ground have significant health implications. Restrictions in traffic, mandatory use of catalytic converters on vehicles, and novel photocatalytic coatings on surfaces contribute to reducing the level of NOx in cities. The aim of this study is to establish environmental profiles of NOx removal by a Three-Way Catalyst (TWC) car converter and by a photocatalytic surface coating (for asphalt and concrete pavements) for fostering technological development in reducing the levels of NOx in urban air. We assessed the environmental performance for the removal of 1 kg NOx by the two technologies with Life Cycle Assessment (LCA; EF.3 impact assessment method). In order to do so, we established Life-Cycle-Inventory (LCI) data representing production, operation and end-of-life of the two technologies based on data from literature and industry. The production of photocatalytic surface coatings, used on concrete and asphalt, has environmental loads two orders of magnitude lower than the environmental benefits of NOx reduction expressed as a reduction in Photochemical Ozone Formation (POF), Acidification (A), and Terrestrial Eutrophication (TE). The vehicle catalytic converter shows similar results except that the use of rare earth elements in the production constitutes a significant load to Freshwater Ecotoxicity (FET) and that additional use of fuel during operation induces a modest Climate Change (CC) impact. For both technologies, the environmental benefits of reducing NOx far exceed any adverse environmental aspects of the production of the technologies.
References
[1]
Brønnum-Hansen, H., Bender, A., Andersen, Z., Sørensen, J., Bønløkke, J., Boshuizen, H., Becker, T., Diderichsen, F. and Loft, S. (2018) Health Impact Assessment of Traffic-Related Air Pollution in Copenhagen Municipality. European Journal of Public Health, 28, Article No. cky213.204.
[2]
Degraeuwe, B., Thunis, P., Clappier, A., Weiss, M., Lefebvre, W., Janssen, S. and Vranckx, S. (2017) Impact of Passenger Car NOx Emissions on Urban NO2 Pollution—Scenario Analysis for 8 European Cities. Atmospheric Environment, 171, 330-337. https://doi.org/10.1016/j.atmosenv.2017.10.040
[3]
European Commission (2008) Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on Ambient Air Quality and Cleaner Air for Europe. Official Journal of the European Union, 152, 1-44.
[4]
Degraeuwe, B., Pisoni, E., Peduzzi, E., De Meij, A., Monforti-Ferrario, F., Bodis, K., Mascherpa, A., Astorga-Llorens, M., Thunis, P. and Vignati, E. (2019) Urban NO2 Atlas. EUR 29943 EN, Publications Office of the European Union, Luxembourg.
[5]
Dey, S. and Mehta, N.S. (2020) Automobile Pollution Control Using Catalysis. Resources, Environment and Sustainability, 2, Article ID: 100006. https://doi.org/10.1016/j.resenv.2020.100006
[6]
Masum, B.M., Masjuki, H.H., Kalam, M.A., Rizwanul Fattah, I.M., M Palash, S. and Abedin, M.J. (2013) Effect of Ethanol-Gasoline Blend on NOx Emission in SI Engine. Renewable and Sustainable Energy Reviews, 24, 209-222. https://doi.org/10.1016/j.rser.2013.03.046
[7]
Linsebigler, A.L., Lu, G. and Yates, J.T. (1995) Photocatalysis on TiO2 Surfaces: Principles, Mechanisms, and Selected Results. Chemical Reviews, 95, 735-758. https://doi.org/10.1021/cr00035a013
[8]
Hüsken, G., Hunger, M. and Brouwers, H.J.H. (2009) Experimental Study of Photocatalytic Concrete Products for Air Purification. Building and Environment, 44, 2463-2474. https://doi.org/10.1016/j.buildenv.2009.04.010
[9]
Laufs, S., Burgeth, G., Duttlinger, W., Kurtenbach, R., Maban, M., Thomas, C., Wiesen, P. and Kleffmann, J. (2010) Conversion of Nitrogen Oxides on Commercial Photocatalytic Dispersion Paints. Atmospheric Environment, 44, 2341-2349. https://doi.org/10.1016/j.atmosenv.2010.03.038
[10]
Martinez, T., Bertron, A., Ringot, E. and Escadeillas, G. (2011) Degradation of NO Using Photocatalytic Coatings Applied to Different Substrates. Building and Environment, 46, 1808-1816. https://doi.org/10.1016/j.buildenv.2011.03.001
[11]
Pedersen, P.D., Lock, N. and Jensen, H. (2021) Removing NOx Pollution by Photocatalytic Building Materials in Real-Life: Evaluation of Existing Field Studies. Journal of Photocatalysis, 2, 84-96. https://doi.org/10.2174/2665976X02666210308151731
[12]
International Organization for Standardization (2006) ISO 14040:2006. Environmental Management—Life Cycle Assessment—Principles and Framework. International Organization for Standardization, Geneva.
[13]
International Organization for Standardization (2006) ISO 14044:2006. Environmental Management—Life Cycle Assessment—Requirements and Guidelines. International Organization for Standardization, Geneva.
[14]
Hassan, M.M. (2010) Quantification of the Environmental Benefits of Ultrafine/Nanotitanium Dioxide Photocatalyst Coatings for Concrete Pavement Using Hybrid Life-Cycle Assessment. Journal of Infrastructure Systems, 16, 160-166. https://doi.org/10.1061/(ASCE)IS.1943-555X.0000016
[15]
Churchill, C.J., Panesar, D.K. and Seto, K. (2015) Preliminary Life Cycle Assessment of Highway Infrastructure Designed with Photocatalytic Cover. Life-Cycle of Structural Systems: Design, Assessment, Maintenance and Management—Proceedings of the 4th International Symposium on Life-Cycle Civil Engineering, Tokyo, 16-19 November 2014, 1765-1770.
[16]
Baral, A., Sen, S. and Roesler, J.R. (2018) Use Phase Assessment of Photocatalytic Cool Pavements. Journal of Cleaner Production, 190, 722-728. https://doi.org/10.1016/j.jclepro.2018.04.155
[17]
Heck, T. (2007) Wärme-Kraft-Kopplung. In: Dones, R., Bauer, C., Bolliger, R., Burger, B., Faist Emmenegger, M., Frischknecht, R., Heck, T., Jungbluth, N. and Röder, A., Eds., Sachbilanzen von Energiesystemen: Grundlagen für den ökologischen Vergleich von Energiesystemen und den Einbezug von Energiesystemen in Őkobilanzen für die Schweiz, Paul Scherrer Institut, Villigen & Swiss Centre for Life Cycle Inventories, Dübendorf, CH.
[18]
Belcastro, E.L. (2012) Life Cycle Analysis of a Ceramic Three-Way Catalytic Converter. Master’s Thesis, Virginia Polytechnic Institute and State University, Blacksburg.
[19]
Manfredi, S., Allacker, K., Chomkhamsri, K., Pelletier, N. and de Souza, D.M. (2012) Product Environmental Footprint (PEF) Guide. Consolidated Version, Joint Research Centre of the European Commission, Ispra.
[20]
Zampori, L. and Pant, R. (2019) Suggestions for Updating the Product Environemtnal Footprint (PEF) Method. EUR 29682 EN, Publications Office of the European Union, Luxembourg.
[21]
European Commission (2013) Commission Recommendation of 9 April 2013 on the Use of Common Methods to Measure and Communicate the Life Cycle Environmental Performance of Products and Organisations 2013/179/EU. Official Journal of the European Union, 124, 1-210.
[22]
Eurostat (2008) NACE Rev. 2—Statistical Classification of Economic Activities in the European Community. European Commission, Luxembourg.
[23]
Wernet, G., Bauer, C., Steubing, B., Reinhard, J., Moreno-Ruiz, E. and Weidema, B. (2016) The Ecoinvent Database Version 3 (Part I): Overview and Methodology. The International Journal of Life Cycle Assessment, 21, 1218-1230. https://doi.org/10.1007/s11367-016-1087-8
[24]
Fazio, S., Biganzioli, F., De Laurentiis, V., Zampori, L., Sala, S. and Diaconu, E. (2018) Supporting Information to the Characterisation Factors of Recommended EF Life Cycle Impact Assessment Methods: New methods and differences with ILCD. EUR 28888 EN, Publications Office of the European Union, Luxembourg.
[25]
Saouter, E., Biganzoli, F., Ceriani, L., Versteeg, D., Crenna, E., Zampolri, L., Sala, S. and Pant, R. (2018) Environmental Footprint: Update of Life Cycle Impact Assessment Methods-Ecotoxicity Freshwater, Human Toxicity Cancer, and Non-Cancer. EUR 29495 EN, Publications Office of the European Union, Luxembourg.
[26]
Sala, S., Crenna, E., Secchi, M. and Pant, R. (2017) Global Normalisation Factors for the Environmental Footprint and Life Cycle Assessment. EUR 28984 EN, Publications Office of the European Union, Luxembourg, Luxembourg,.
[27]
Clavreul, J., Baumeister, H., Christensen, T.H. and Damgaard, A. (2014) An Environmental Assessment System for Environmental Technologies. Environmental Modelling & Software, 60, 18-30. https://doi.org/10.1016/j.envsoft.2014.06.007
[28]
Fujishima, A. and Honda, K. (1972) Electrochemical Photolysis of Water at a Semiconductor Electrode. Nature, 238, 37-38. https://doi.org/10.1038/238037a0
[29]
Frank, S.N. and Bard, A.J. (1977) Heterogeneous Photocatalytic Oxidation of Cyanide Ion in Aqueous Solutions at TiO2 Powder. Journal of the American Chemical Society, 99, 303-304. https://doi.org/10.1021/ja00443a081
[30]
Fujishima, A., Rao, T.N. and Tryk, D.A. (2000) Titanium Dioxide Photocatalysis. Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 1, 1-21. https://doi.org/10.1016/S1389-5567(00)00002-2
[31]
Fujishima, A. and Zhang, X. (2006) Titanium Dioxide Photocatalysis: Present Situation and Future Approaches. Comptes Rendus Chimie, 9, 750-760. https://doi.org/10.1016/j.crci.2005.02.055
[32]
Lasek, J., Yu, Y.H. and Wu, J.C.S. (2013) Removal of NOx by Photocatalytic Processes. Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 14, 29-52. https://doi.org/10.1016/j.jphotochemrev.2012.08.002
[33]
Chen, M. and Chu, J. W. (2011) NOx Photocatalytic Degradation on Active Concrete Road Surface—From Experiment to Real-Scale Application. Journal of Cleaner Production, 19, 1266-1272. https://doi.org/10.1016/j.jclepro.2011.03.001
[34]
Chen, H., Nanayakkara, C.E. and Grassian, V.H. (2012) Titanium Dioxide Photocatalysis in Atmospheric Chemistry. Chemical Reviews, 112, 5919-5948. https://doi.org/10.1021/cr3002092
[35]
Tsang, C.H.A., Li, K., Zeng, Y., Zhao, W., Zhang, T., Zhan, Y., Xie, R., Leung, D.Y. C. and Huang, H. (2019) Titanium Oxide Based Photocatalytic Materials Development and Their Role of in the Air Pollutants Degradation: Overview and Forecast. Environment International, 125, 200-228. https://doi.org/10.1016/j.envint.2019.01.015
[36]
Skov, M.C., Kristensen, S.E. and Mikkelsen, T.N. (2021) Photocatalytic Properties of TiO2 for the Degradation of O3: Examined by Relevant Parameters. Journal of Photocatalysis, Submitted.
[37]
Mothes, F., Böge, O. and Herrmann, H. (2016) A Chamber Study on the Reactions of O3, NO, NO2 and Selected VOCs with a Photocatalytically Active Cementitious Coating Material. Environmental Science and Pollution Research, 23, 15250-15261. https://doi.org/10.1007/s11356-016-6612-6
[38]
Serpone, N. (2018) Heterogeneous Photocatalysis and Prospects of TiO2-Based Photocatalytic DeNOxing the Atmospheric Environment. Catalysts, 8, Article No. 553. https://doi.org/10.3390/catal8110553
[39]
Faraldos, M., Kropp, R., Anderson, M.A. and Sobolev, K. (2016) Photocatalytic Hydrophobic Concrete Coatings to Combat Air Pollution. Catalysis Today, 259, 228-236. https://doi.org/10.1016/j.cattod.2015.07.025
[40]
Benedix, R., Dehn, F., Quaas, J. and Orgass, M. (2001) Application of Titanium Dioxide Photocatalysis to Create Self-Cleaning Building Materials. Lacer, 5, 157-168.
[41]
Jensen, H. and Pedersen, P.D. (2021) Real-Life Field Studies of the NOx Removing Properties of Photocatalytic Surfaces in Roskilde and Copenhagen Airport. Denmark. Journal of Photocatalysis, 2, 71-81. https://doi.org/10.2174/2665976X01999200811155905
[42]
Hernández-Alonso, M.D., Suárez, S., Fresno, F., Coronado, J.M. and Sánchez, B. (2021) Simultaneous Photocatalytic Abatement of NO and SO2: Influence of the TiO2 Nature and Mechanistic Insights. Journal of Photocatalysis, 2, 130-139. https://doi.org/10.2174/2665976X02666210303124330
[43]
Shelef, M. and McCabe, R.W. (2000) Twenty-Five Years after Introduction of Automotive Catalysts: What Next? Catalysis Today, 62, 35-50. https://doi.org/10.1016/S0920-5861(00)00407-7
[44]
European Environment Agency (2019) EMEP/EEA Air Pollutant Emission Inventory Guidebook. EEA Report No 13, European Environment Agency, Copenhagen, Denmark.
[45]
Nova, I. and Tronconi, E. (2014) Urea-SCR Technology for DeNOx After Treatment of Diesel Exhausts. Springer, New York. https://doi.org/10.1007/978-1-4899-8071-7
[46]
Heck, R.M., Farraruto, R.J. and Gulati, S.T. (2016) Catalytic Air Pollution Control: Commercial Technology. 3rd Edition, John Wiley & Sons, Hoboken.
[47]
Valverde, V., Mora, B., Clairotte, M., Pavlovic, J., Suarez-Bertoa, R., Giechaskiel, B., Astorga-LLorens, C. and Fontaras, G. (2019) Emission Factors Derived from 13 Euro 6b Light-Duty Vehicles Based on Laboratory and On-Road Measurements. Atmosphere, 10, Article No. 243. https://doi.org/10.3390/atmos10050243
[48]
Massaguer, A., Pujol, T., Comamala, M. and Massaguer, E. (2020) Feasibility Study on a Vehicular Thermoelectric Generator Coupled to an Exhaust Gas Heater to Improve Aftertreatment’s Efficiency in Cold-Starts. Applied Thermal Engineering, 167, Article ID: 114702. https://doi.org/10.1016/j.applthermaleng.2019.114702
[49]
Saurat, M. and Bringezu, S. (2008) Platinum Group Metal Flows of Europe, Part 1. Global Supply, Use in Industry, and Shifting of Environmental Impacts. Journal of Industrial Ecology, 12, 754-767. https://doi.org/10.1111/j.1530-9290.2008.00087.x
[50]
Bossi, T. and Gediga, J. (2017) The Environmental Profile of Platinum Group Metals Interpretation of the Results of a Cradle-to-Gate Life Cycle Assessment of the Production of Pgms and the Benefts of Their Use in a Selected Application. Johnson Matthey Technology Review, 61, 111-121. https://doi.org/10.1595/205651317X694713
[51]
Amatayakul, W. and Ramnäs, O. (2001) Life Cycle Assessment of a Catalytic Converter for Passenger Cars. Journal of Cleaner Production, 9, 395-403. https://doi.org/10.1016/S0959-6526(00)00082-2
[52]
Fanick, R., Kroll, S., Swarts, A. and Quarderer, S. (2019) Effects of Dual Port Injection and Direct-Injection Technology on Combustion Emissions from Light-Duty Gasoline Vehicles. SAE International, Warrendale. https://doi.org/10.4271/2019-01-0999
[53]
Hagelüken, C. (2005) Die Märkte Der Katalysatormetalle Platin, Palladium Und Rhodium. In: Hagelüken, C., Ed., Autoabgaskatalysatoren, Expert Verlag, Renningen, 114-135.
[54]
Baral, N.R., Kavvada, O., Mendez-Perez, D., Mukhopadhyay, A., Lee, T.S., Simmons, B.A. and Scown, C.D. (2019) Techno-Economic Analysis and Life-Cycle Greenhouse Gas Mitigation Cost of Five Routes to Bio-Jet Fuel Blendstocks. Energy & Environmental Science, 12, 807-824. https://doi.org/10.1039/C8EE03266A
[55]
Steff, B. (2021) New Mix Could Double Concrete’s Carbon Uptake. Purdue University News. https://www.purdue.edu/newsroom/releases/2021/Q1/new-mix-could-double-concretes-carbon-uptake.html#.YCWU7nSxxAE.linkedin
[56]
Ghodrat, M., Rhamdhani, M.A., Sharafi, P. and Samali, B. (2017) A Comparative Life Cycle Assessment of Recycling the Platinum Group Metals from Automobile Catalytic Converter: An Australian Perspective. Metallurgical and Materials Transactions E, 4, 77-88. https://doi.org/10.1007/s40553-017-0109-1
[57]
Islam, K.M.N., Hildenbrand, J. and Hossain, M.M. (2018) Life Cycle Impacts of Three-Way Ceramic Honeycomb Catalytic Converter in Terms of Disability Adjusted Life Year. Journal of Cleaner Production, 182, 600-615. https://doi.org/10.1016/j.jclepro.2018.02.059
