Waste catalyst as raw material in alumina–silica refractories

Abstract

This work aims for the development of methodology for the utilization of the waste catalyst from hydrocarbons catalytic cracking process in the production of alumina–silica refractories. This residue was used in substitution of part of conventional raw materials, with the consequent ambient and economic profit. Some formulations were selected based on the chemical and mineralogical compositions of refractory bodies. They were fired in similar temperatures to those used for the production of commercial refractories. The analysis of the technological properties of the bodies revealed that the composition containing 15 wt% of catalyst waste had suitable characteristics. The final product showed technical parameters similar to that of a commercial refractory material.

Upcycling spent petroleum cracking catalyst: pulsed laser deposition of single-wall carbon nanotubes and silica nanowires

“…17 Largely dominated by FC3R, spent catalysts have since been tested as substitute or aggregate in a variety of admixtures, mainly for construction. In addition to refractories 18,19 and ceramic frits, 20 their pozzolanic activity seems to hold the greatest promise: high-performance Portland cements, pastes, binders, mortars and concretes have been successfully manufactured with cement substitution rates of up to 40 wt%. 21 The characteristics of these composite products versus their standard counterparts range from similar quality to 117% pozzolanic activity, 21 147% compressive strength 22 and improved hydraulics, durability, bleeding and setting times.…”