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Catalysts
Special Issues
Recent Advances Utilized in the Recycling of Catalysts
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Recent Advances Utilized in the Recycling of Catalysts

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Environmental Catalysis".

Deadline for manuscript submissions: closed (15 August 2020) | Viewed by 9692

Special Issue Editor

Dr. Katarzyna Staszak

E-Mail Website
Guest Editor
Institute of Chemical Technology and Engineering, Poznan University of Technology, Berdychowo St. 4, 60-965 Poznan, Poland
Interests: separations; metal recovery; membrane techniques; adsorption; surfactants
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The choice of topic of Special Issue “Recent Advances Utilized in the Recycling of Catalysts” is not accidental. The idea came up during continuous searching of potential secondary sources of metals, as well as methods for their recovery.

Catalytic processes are widely used in the industry. In addition to the undeniable benefits of their application, it should be borne in mind that their use is time-limited. The industry generates thousands of tons per year of spent catalysts containing valuable, but usually hazardous, metals, such as the platinum-group metals (PGMs), the rare-earth elements (REEs), and the variety of transition metals. Thus, the spent catalysts can be considered as the secondary source of metals. Today, the recovery of raw materials from waste sources is not only an ecological idea, but it is the overarching goal of the zero waste economy.

This Special Issue is a collection of suitable research articles related to the recent methods of metal reclamation from spent catalysts.

Dr. Katarzyna Staszak
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • spent catalysts
  • recycling
  • metal recovery
  • wastes to value-added products
  • zero waste economy

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Published Papers (2 papers)

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Research

17 pages, 9133 KiB  
Article
Modifications and Improvements to the Collector Metal Method Using an mhd Pump for Recovering Platinum from Used Car Catalysts
by Mariola Saternus, Agnieszka Fornalczyk, Władysław Gąsior, Adam Dębski and Sylwia Terlicka
Catalysts 2020, 10(8), 880; https://doi.org/10.3390/catal10080880 - 4 Aug 2020
Cited by 17 | Viewed by 3967
Abstract
Today recovery of platinum from used auto catalysts has become a necessity due to great demand for this catalytic metal. There are many methods of recovering platinum from used catalysts on the market, one of them is the original collector metal method using [...] Read more.
Today recovery of platinum from used auto catalysts has become a necessity due to great demand for this catalytic metal. There are many methods of recovering platinum from used catalysts on the market, one of them is the original collector metal method using the magneto-hydrodynamic (mhd) pump. This method is based on the continuous flow of the collector metal (lead) in the channel of the device, which can be obtained by using the mhd pump at the device operating temperature of 673 K. Proper selection of process parameters such as power frequency (25–100 Hz), inductor current density (20 A, 40 A, 60 A), gaps between the inductor and the liquid metal channel (2,4,8), flow velocity, secondary voltage (19 V, 40 V, 60 V) ensures proper efficiency of the device. Some parameters were selected on the basis of numerical simulations, others were experimentally verified—the tests were carried out for different washing out times (600 s to 3600 s), and different secondary voltage and inductor supply frequency (25 Hz to 45 Hz). Platinum washing out efficiency of up to 98% was obtained with a relatively short washing out time and low values of secondary voltage and inductor frequency. To improve the efficiency of the process, the thermal efficiency of the device was increased by 8% by insulating the cover of the device. Further modifications to the process include changing the collector metal—preliminary studies show that the addition of lithium increases the extraction of platinum from thin catalytic layers as a result of reduced surface tension of the extraction liquid. The preliminary results of the PbLi alloy spread on platinum coated surface seem to be very promising. Full article
(This article belongs to the Special Issue Recent Advances Utilized in the Recycling of Catalysts)
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13 pages, 1627 KiB  
Article
Hydrometallurgical Recovery of Cobalt(II) from Spent Industrial Catalysts
by Zuzanna Wiecka, Martyna Rzelewska-Piekut, Ryszard Cierpiszewski, Katarzyna Staszak and Magdalena Regel-Rosocka
Catalysts 2020, 10(1), 61; https://doi.org/10.3390/catal10010061 - 1 Jan 2020
Cited by 23 | Viewed by 5345
Abstract
The work presents studies on the application of hydrometallurgical recovery of cobalt(II) from solutions after leaching spent industrial catalysts used in process of hydrodesulfurization. A four-stage process was proposed, which consists of: leaching, precipitation of metal hydroxides accompanying Co(II), extraction of Co(II) with [...] Read more.
The work presents studies on the application of hydrometallurgical recovery of cobalt(II) from solutions after leaching spent industrial catalysts used in process of hydrodesulfurization. A four-stage process was proposed, which consists of: leaching, precipitation of metal hydroxides accompanying Co(II), extraction of Co(II) with bis(2,4,4-trimethylpentyl)phosphinic acid and Co(II) stripping from the organic phase. The results indicate that by using the proposed method it is possible to leach Co(II) and Mo(VI) from spent catalyst, and remove main impurities such as Al(III), Fe(III) in hydroxide precipitation step and separate Co(II) from Mo(VI) by extraction and stripping. Full article
(This article belongs to the Special Issue Recent Advances Utilized in the Recycling of Catalysts)
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