Cobalt oxide and cerium oxide catalyst for purifying particulate emission of diesel engine and preparation method

Abstract

The invention relates to a cobalt-cesium oxide catalyst for purifying carbon particles and a preparation method thereof, in particular to a catalyst for treating motor vehicle tail gas pollution, especially for treating the carbon particles from diesel vehicle tails gas, as well as the preparation method thereof. The catalyst is a double-oxide composite catalyst, in particular a catalyst which consists of cobalt loaded on nano cerium dioxide or bulk phase mixed oxide of the cobalt and the cesium, and does not contain precious metal components. The catalyst is nano particles and is suitable for processing the carbon particles in the diesel vehicle tail gas; and the minimum combustion peak temperature reaches 364 DEG C under the condition that the catalyst loosely contacts the carbon particles, which corresponds to the catalytic combustion activity of the carbon particles and the loaded precious metal catalyst.

Description

technical field [0001] The invention relates to a catalyst for purifying soot particles emitted by diesel vehicles and a preparation method thereof, belonging to the fields of catalyst technology and environmental protection. Background technique [0002] Pollutants in the exhaust of diesel vehicles, especially particulate matter (PM) and nitrogen oxides (NO x ) pollution to the environment and the impact on human health are being widely concerned by people. In particular, the emission of soot particles from diesel vehicles is about 30-80 times that of gasoline engines, and 70% of the emissions are less than 0.3 μm in particle size, and are adsorbed with various organic compounds, such as C1-C20 hydrocarbons (which contain barium phosphide), phenols, amines, benzopyrene carcinogens and other oxygen-containing compounds. These extremely fine particles have different sedimentation rates in the air, and their particle size is just suspended in the human respiratory layer in t...

AI Technical Summary

Problems solved by technology

These noble metal catalysts can also oxidize or decompose soluble organic matter (SOF), HC and CO, but these noble metal catalysts such as Pt and Pd are expensive, which limits their application in industrial production, so it is of great significance to develop cheap non-precious metal catalysts to purify soot very important

[0005] Chinese patent CN 1139428C discloses several non-precious metal series catalysts that catalyze diesel soot combustion, mainly LaCoO doped with alkali metals 3 Perovskite and CuFe 2 o 4 The composition of spinel composite oxide can reduce the combustion temperature of soot particles by 160-180°C, but the combustion temperature of soot is still above 400°C, so its catalytic performance cannot fully meet the requirements of diesel vehicle exhaust purification.

However, the composition of this type of catalyst needs to form a perovskite and perovskite-like composite metal oxide structure. There are many components to be selected, and the requirements for catalyst preparation are relatively high.

Images