Platinum extraction from different secondary sources has been experimentally tested by many researchers. In this article, dissolution of platinum in aqua-regia solution from two types of spent catalysts (reforming and nitric acid production) was kinetically studied. A variety of kinetic models for heterogeneous solid-liquid reactions, including homogeneous diffusion model, shrinking core model,...

A comprehensive study on the acidic and coking properties of selectivated H-ZSM-5 catalysts during xylene isomerization has been made. The effects of surface modification by pre-coking and silylation on the nature and location of carbonaceous deposits and on related acidic features of the spent catalysts were respectively characterized by Xe NMR of adsorbed Xe and solid-state P MAS NMR of adsor...

Application of aromatic compounds has dramatically increased as raw materials in various industries and different factories have been established to produce aromatic compounds. The current research aims at characterizing industrial waste generation in aromatics production process in petrochemical industries and determining the best feasible alternative for waste disposal. For this purpose, the ...

Abstract The paper presents a quick method for the quantification of nickel species in spent FFC catalysts; known quantities NiO and $$\hbox{NiAl}_2\hbox{O}_{4}$$ NiAl 2 O 4 is first done matrix fresh ...

Application of aromatic compounds has dramatically increased as raw materials in various industries and different factories have been established to produce aromatic compounds. The current research aims at characterizing industrial waste generation in aromatics production process in petrochemical industries and determining the best feasible alternative for waste disposal. For this purpose, the ...

Spent HDS catalyst is an important secondary resource for extracting molybdenum. This study aimed to introduce a comprehensive process separating and recovering molybdenum from the roasted spent catalysts. The brief flow of novel technology contains pressure Na2CO3 liquor leaching, selective extraction using N263, circulating leaching raffinate. in catalysts can be leached by with 95.4%. Methyl...