Abstract
The catalytic activity in the soot combustion is reported for a series of potassium-promoter alumina supported catalysts prepared by the sol-gel method to be used in the catalytic combustion of soot. The studied systems correspond to CeO2-Al2O3 and La2O3-Al2O3 with charges of 3 and 5 wt% of CeO2 and La2O3. Potassium impregnation is performed to reach 3 atoms of K per nm2 of the mixed oxide. The effect of the potassium incorporation increases its reducibility, decreases the surface area and forms a new type of oxygen that is stronger than the oxygen in mixed oxides with similar chemical nature. The existence of potassium oxides, K2O and oxygen responsible for the vacancies and/or lattice defects (O2−) are related to good catalytic activity. Additionally, the presence of alkali affects the structural and textural characteristics of the catalyst, promoting the catalytic activity in soot combustion.
Highlights
It is generally known that in the oxidation of hydrocarbons, the volatile organic compounds (VOCs), the particulate matter such as soot, and the emission of NOx species into the atmosphere are harmful to people and environment [1]
The temperatures at which the gases emitted into the atmosphere are cooled between 300 ̊C and 400 ̊C, coal is burned at temperatures that range between 500 ̊C and 600 ̊C
The impregnation of 10 wt% of a metal could decrease the surface area of the support, the larger decreases illustrated in Table 1 were a consequence of the chemical behavior of potassium
Summary
It is generally known that in the oxidation of hydrocarbons, the volatile organic compounds (VOCs), the particulate matter such as soot, and the emission of NOx species into the atmosphere are harmful to people and environment [1]. An alternative for the control of these species is catalytic combustion [2]-[8]. Soot is a particulate material resulting from the incomplete combustion. (2015) Effect of Potassium on Sol-Gel Cerium and Lanthanum Oxide Catalysis for Soot Combustion. An alternative is to burn this particulate material [7] [9]. The catalyst deposited in the ceramic filters could oxidize the soot, reducing its emission into the atmosphere. The catalysts used in the catalytic combustion of soot must be capable of presenting catalyst activity at low temperatures [10]
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