Optimization of the CeO2/CeCl3 cycle by cerium IV oxide reductive dissolution catalysis

Lemont, Florent; Barbier, Alisée; Resin, Samuel

doi:10.1016/j.ijhydene.2015.07.137

Cited by 2 publications

(4 citation statements)

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“…CeO 2 was added in large excess with respect to Pt; consequently, a certain fraction remained unreacted even after milling. As shown in eq , CeO 2 oxidizes HCl to produce Cl 2 . , The production of Cl 2 was also confirmed from the positive iodine–starch test. 2 normalC normale normalO 2 + 8 normalH normalC normall → normalC normall 2 + 2 normalC normale normalC normall 3 + 4 normalH 2 normalO …”

Section: Resultsmentioning

confidence: 60%

“…As shown in eq 1, CeO 2 oxidizes HCl to produce Cl 2 . 24,25 The production of Cl 2 was also confirmed from the positive iodine−starch test.…”

Section: ■ Results and Discussionmentioning

confidence: 79%

“…CeO 2 was added in large excess with respect to Pt; consequently, a certain fraction remained unreacted even after milling. As shown in eq 1, CeO 2 oxidizes HCl to produce Cl 2 24,25. The production of Cl 2 was also confirmed from the positive iodine−starch test.…”

mentioning

confidence: 62%

“…Ce is the most abundant rare-earth element (REE), , and CeO 2 is used as a cocatalyst in various applications, such as automobile exhaust gas purification systems and glass polishers. Owing to the increasing prices of REEs in 2011, both the reuse of glass abrasive CeO 2 and its replacement with zirconia-based materials have been encouraged, consequently lowering the demand for Ce and resulting in its oversupply. , Recently, Lemont , demonstrated a new CeO 2 application that produces Cl 2 and H 2 from HCl via a CeO 2 /CeCl 3 cycle. As new applications of CeO 2 , such as the one by Lemont, are attractive from the viewpoint of resolving the REE balance problem, we endeavored herein to report on a new application of CeO 2 that exploits its excellent oxidizing ability.…”

Section: Introductionmentioning

confidence: 99%

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Novel Mechanically Assisted Dissolution of Platinum Using Cerium(IV) Oxide

Kasuya

Bujňáková

Baláž

et al. 2022

ACS Sustainable Chem. Eng.

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Platinum group metals (PGMs) are important for a variety of applications, including catalysis; however, the amounts mined are inadequate relative to global requirements. Therefore, methods for the recovery of PGMs from spent resources are urgently required. Herein, we report that platinum (Pt) can be dissolved by hydrochloric acid (HCl) alone using cerium(IV) oxide (CeO 2 ) as a solid oxidizing agent, which can minimize the highly corrosive chlorine. Ptcontaining catalysts were subjected to high-energy ball milling in the presence of CeO 2 , and their dissolution behavior in HCl was subsequently investigated. Ball milling was found to promote direct Pt-oxidation, as indicated by the significantly increased solubility in HCl. Several analytical techniques, including X-ray diffractometry, surface area and pore size analysis, X-ray photoelectron spectroscopy, ultraviolet−visible spectroscopy, inductively coupled plasma mass spectrometry, and atomic emission spectroscopy, were used for characterization. This study demonstrates the environmentally acceptable characteristics of high-energy ball milling and its applicability in the recycling of important noble metal substances from waste materials.

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