Investigation of the Dual-Regulatory Mechanism of Zr in MnREZrO Oxide Catalysts for NO Oxidation.

Utilizing Diesel Oxidation Catalysts (DOC) to partially oxidize NO to NO is a crucial step in controlling NO emissions from diesel engines. However, enhancing both catalytic activity and hydrothermal stability remains a significant challenge. Benefiting from abundant asymmetric oxygen vacancies and increased Mn content, MnREZr exhibits superior NO oxidation performance (T = 337 °C) and hydrothermal aging resistance (T = 340 °C) compared to the undoped sample (T = 365 °C).

Effects of hydrogen peroxide co-precipitation and inert N atmosphere calcination on CeZrLaNd mixed oxides and the catalytic performance used on Pd supported three-way catalysts.

The unique reversible oxygen storage and release capacity of cerium zirconium mixed oxides makes them ideal washcoat materials of automotive three-way catalysts (TWC). In this work, cerium zirconium mixed oxides of CeZrLaNdO were prepared a co-precipitation method. The effects of hydrogen peroxide co-precipitation and inert N atmosphere calcination on the structure and properties of cerium zirconium mixed oxides were investigated systematically by Brunauer-Emmett-Teller surface area measurements, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, hydrogen temperature-programmed reduction, oxygen storage capacity (OSC), Raman spectroscopy, and X-ray photoelectron spectroscopy.

Recovery of fluorine from bastnasite as synthetic cryolite by-product.

This paper investigates the development of a new environment friendly approach for treatment of bastnasite. A new process was developed to recover fluorine from bastnasite as synthetic cryolite by-product. The conditions affecting the fluorine removal and recovery in the process, including contact time, acidity, Al(3+) concentration, Al/F molar ratio and different kinds of aluminum salts being used, were investigated.