Abstract
Platinum group metals (PGM) are used as a catalyst in the automotive catalytic converters to curb engine emissions. The modern catalytic converter (three-way) executes oxidation of CO and unburnt HC, and reduction of NO using its large active surfaces containing PGM, which are precious metals with high cost all over the world. Due to the high cost of the PGM, researchers are working on efficient methods for extracting and reusing these valuable metals from catalytic converters. Pyrometallurgy and hydrometallurgy are the most common ways for the extraction of the PGMs among other methods. Alternative to platinum, materials like titanium dioxide and other metal-based oxides can be used for carrying out redox reactions of toxic vehicular emissions. The use of such alternative catalysts can help in reducing the increasing demands and cost of PGMs. This chapter focuses on the possibilities of recycling the PGMs from catalytic converters and also of reducing the ever-increasing requirement of PGMs in the manufacturing of autocatalysts in the catalytic converters. The chapter reports the recent global trends of PGM recycling and its demand for use as autocatalysts, alternative materials of to PGMs in catalytic converters and alternative methods for emission reduction. Further, the engine-related challenges and research on future directions of replacing PGM’s as autocatalysts has been performed; it includes some experimental results of direct decomposition of NOx using non-noble metal catalysts such as Cu-COK12, Cu-Nb2O5, Cu-YZeolite, and Cu-ZSM5. The article should also provide a quicker understanding of research on development of low-cost non-noble metal-based alternative autocatalysts.
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Abbreviations
- ATR-FTIR:
-
Attenuated total reflectance-Fourier transform infrared
- BET:
-
Brunauer–Emmett–Teller
- CHN:
-
Carbon Hydrogen Nitrogen analysis
- CI:
-
Compression ignition
- CO:
-
Carbon monoxide
- DeNOx:
-
Direct decomposition of NOx
- DPF:
-
Diesel particulate filter
- FSP:
-
Flame spray pyrolysis
- FTIR:
-
Fourier Transform Infrared Spectroscopy
- H2-TPR:
-
Hydrogen-temperature programmed reduction
- HC:
-
Hydrocarbons
- HRTEM:
-
High-Resolution Transmission Electron Microscopy
- ICP-OES:
-
Inductively coupled plasma—optical emission spectrometry
- LRS:
-
Laser Raman spectroscopy
- MFC:
-
Mass flow controller
- N2O:
-
Nitrous oxide
- NDIR:
-
Nondispersive infrared sensor
- NH3-TPD:
-
Ammonia-Temperature programmed desorption
- NO:
-
Nitrogen oxide
- NO2:
-
Nitrogen dioxide
- NO-TPO:
-
Nitrogen oxide- Temperature programmed oxidation
- NOx:
-
Nitrogen oxide gases
- PGM:
-
Platinum group metals
- PM:
-
Particulate matter
- PXRD:
-
Powder X-ray diffraction
- ROW:
-
Rest of World
- SA:
-
Surface Area
- SCR:
-
Selective catalytic reduction
- SEM:
-
Scanning electron microscope
- SEM-EDX:
-
Energy-dispersive X-ray spectroscopy
- SI:
-
Spark ignition
- TEM:
-
Transmission electron microscopy
- TGA:
-
Thermogravimetric analysis
- TGA-DTA:
-
Thermal gravimetric analysis -Differential thermal analysis
- TPD:
-
Temperature programmed desorption
- TPO:
-
Temperature programmed oxidation
- TPR:
-
Temperature programmed reduction
- UHC:
-
Unburnt hydrocarbons
- USA:
-
United States of America
- UV vis DRS:
-
UV–vis diffuse reflectance spectroscopy
- XPS:
-
X-ray photoelectron spectroscopy
- XRD:
-
X-ray diffraction
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Acknowledgements
The work was supervised by Dr. Atul Dhar, School of Engineering, Indian Institute of Technology Mandi, H.P., India. The research was performed with the collaboration of CSIR-Indian Institute of Petroleum, Dehradun, U.K., India, Indian Institute of Technology Mandi, H.P., India, and Centre of Earth Observation Science, School of Applied Sciences, University of Brighton, Brighton, BN24GJ, United Kingdom.
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M.K. Shukla: Conceptualization, Methodology, Visualization, Writing- Original draft preparation; Balendra V.S. Chauhan: Investigation, Draft preparation, Writing and Editing; Dr. Thallada Bhaskar: Data curation, Visualization and Supervision; Dr. Atul Dhar: Validation, Supervision, Reviewing and Editing; Dr. Ajitanshu Vedratnam: Visualization, Draft preparation, Editing.
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Shukla, M.K., Chauhan, B.V.S., Bhaskar, T., Dhar, A., Vedratnam, A. (2023). Recycling of Platinum Group Metals and Alternative Catalysts for Catalytic Converters. In: Upadhyay, R.K., Sharma, S.K., Kumar, V., Valera, H. (eds) Transportation Systems Technology and Integrated Management. Energy, Environment, and Sustainability. Springer, Singapore. https://doi.org/10.1007/978-981-99-1517-0_17
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DOI: https://doi.org/10.1007/978-981-99-1517-0_17
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