Rhenium- and ruthenium-containing catalysts for neutralization of automobile exhaust

Фесик, Е. В.; Zarazhevskii, V. I.; Grebnev, V. V.; Mal'chikov, G. D.

doi:10.1134/s0023158413050054

Cited by 5 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The average total concentration of PGEs in RDS in this study was 321 ppb, making it unlikely that RDS can be an economic source of PGEs. Research into the reduction and removal of PGE contents from catalytic converters (Fesik et al 2013) is thus vital in terms of health consequences and PGE availability.…”

Section: Pgesmentioning

confidence: 99%

Characterisation of road-dust sediment in urban systems: a review of a global challenge

et al. 2020

View full text Add to dashboard Cite

Purpose The proportion of people living in urbanised areas is predicted to rise to > 65% by 2050, and therefore, more humans than ever will be exposed to urban environmental pollution. Accumulation of organic and inorganic substances on street and road surfaces is a major global challenge requiring scientifically robust methods of establishing risk that inform management strategies. This aim of this contribution is to critically review the global literature on urban road–deposited sediment contamination with a specific focus on variability in sampling and analytical methods. Materials and methods In order to assess the concentration of contaminants in global road-deposited sediment (RDS), a comprehensive search of published RDS studies was completed. We review methodological approaches used in RDS studies to highlight the variability in datasets as a result of sampling technique, grain size fractionation, geochemical and mineralogical characterisation methods and establishing the influence of local geology on contaminant concentrations. We also consider emerging contaminants in RDS, and we provide a workflow diagram which promotes a standardised sampling and analysis regime that we believe can reduce data variability and promote collaboration when it comes to tackling the important issue of RDS contamination. Results and discussion Across the literature, Asia (except China) and Africa are underrepresented in RDS studies despite these continents having the largest and fastest growing populations, respectively. The removal of tetraethyl lead from gasoline produced a noticeable decrease in lead concentrations in global RDS, and platinum group element (PGE) concentrations in RDS were consistent with catalytic converter usage. Research into the impact of electric vehicles on non-exhaust emissions suggests other contaminants such as zinc may become more prominent in the future. Most RDS studies consider grain size fractions larger than > 20 μm due to sampling constraints despite RDS < 20 μm being most relevant to human health. The use of chemical extraction methods to establish contaminant geochemistry is popular; however, most extraction procedures are not relevant or specific to minerals identified in RDS through microscopic and spectroscopic investigations. Conclusions This review highlights considerable variability in sampling and analytical approach which makes it difficult to identify broad global patterns in RDS contamination. To remove this variability from future RDS research, this review suggests a workflow plan which attempts to improve the comparability between RDS studies. Such comparability is crucial in identifying more discrete RDS trends and informing future emission policy.

show abstract

Section: Pgesmentioning

confidence: 99%

Characterisation of road-dust sediment in urban systems: a review of a global challenge

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Platinum and/or palladium are responsible for the oxidation of hydrocarbons and CO, while NO x reduction is carried out with rhodium [4]. In search of economic catalytically active metals, research on replacing the expensive Rh (price in October 2021: 13,800 $/Oz) with a cheaper Ru (price in October 2021: 659 $/Oz) has been carried out [5] due to catalysts containing Ru can be used to reduce NO x [6][7][8]. Therefore, in the present studies, except for Pt, Pd and Rh, also Ru was included.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Formation of Catalytically Active PGM Nanoparticles from Model Solutions as a Basis for the Recycling of Spent Catalysts

2022

View full text Add to dashboard Cite

The paper presents basic studies on the precipitation of platinum, palladium, rhodium, and ruthenium nanoparticles from model acidic solutions using sodium borohydride, ascorbic acid, and sodium formate as reducing agents and polyvinylpyrrolidone as a stabilizing agent. The size of the obtained PGM particles after precipitation with NaBH4 solution does not exceed 55 nm. NaBH4 is an efficient reducer; the precipitation yields for Pt, Pd, Ru, Rh are 75, 90, 65 and 85%, respectively. By precipitation with ascorbic acid, it is possible to efficiently separate Pt, Rh, and Ru from Pd from the two-component mixtures. The obtained Pt, Pd, and Rh precipitates have the catalytic ability of the catalytic reaction of p-nitrophenol to p-aminophenol. The morphological characteristic of the PGM precipitates was analyzed by AFM, SEM-EDS, and TEM.

show abstract

Low temperature catalytic reduction of NO over porous Pt/ZIF-8

Challagulla

Payra

Rameshan

et al. 2020

Journal of Environmental Chemical Engineering

View full text Add to dashboard Cite

Rhenium- and ruthenium-containing catalysts for neutralization of automobile exhaust

Cited by 5 publications

References 4 publications

Characterisation of road-dust sediment in urban systems: a review of a global challenge

Characterisation of road-dust sediment in urban systems: a review of a global challenge

Studies on the Formation of Catalytically Active PGM Nanoparticles from Model Solutions as a Basis for the Recycling of Spent Catalysts

Low temperature catalytic reduction of NO over porous Pt/ZIF-8

Contact Info

Product

Resources

About