Composite carrier of metal fiber and inorganic fiber and preparation method

Abstract

The invention relates to a composite carrier of metal fiber and inorganic fiber and a preparation method. The method comprises the following steps of: (1) preserving heat of the metal fiber for 2 hours under the condition of 650-750 DEG C; and transferring into treatment solution containing 1 percent H3PO4 and 0.2 percent SO4 to treat at the temperature of 50 DEG C for 4 hours, washing with water for three times, and drying the moisture; (2) mechanically stirring and mixing each ingredient of an inorganic fiber coating, and then making a layer of wet mixed slurry on a metal fiber screen by using a paper making method; blowing with compressed air of 0.05-0.1 MPa; and rolling into a carrier blank of a concentric circle, a double-core circle or a three-core circle in a wet state; and (3) finally, integrally and simultaneously blowing one end of each the rolled carrier blank at one time by using the compressed air of 0.2-0.4 MPa; raising temperature in a high-temperature furnace along with the furnace at the rate of 80 DEG C / 60 minutes, 120 DEG C / 60 minutes, 200 DEG C / 30 minutes, 300 DEG C / 60 minutes or 500 DEG C / 120 minutes; and then cooling to room temperature along with the furnace. The carrier is sintered into the carrier with the composite structure of spatially and three-dimensionally crossed metal fiber and inorganic fiber after being rolled, is tidy in the macroscopic level and confused in the microscopic level, and is used for SCR (Selective Catalytic Reduction) and POC (Particle Oxidation Catalyst) post-treatment; a back pressure problem is avoided; the process is simple and convenient; and the cost is equivalent to 1 / 2 that of an imported product under the condition of equivalent performance, so that the cost is saved.

Description

technical field [0001] The invention relates to a composite carrier of metal fibers and inorganic fibers and a preparation method, which is applied in the automobile engine industry and meets the requirements of environmental protection standards above Euro 4. Background technique [0002] Low-emission engines have become a hot spot for new technology competition. Select appropriate after-treatment technology strategies and equipment, such as SCR, DPF, DOC, POC and other after-treatment measures to meet Euro 4 or Euro 5 emission standards. [0003] The SCR post-processor uses urea to decompose NH 3 , as a reducing agent and the NOX in the engine exhaust react on the carrier loaded with the catalyst to generate non-toxic N 2 and H 2 O, so as to achieve the purpose of purification; the essence of DPF post-processor technology is to use a special carrier, such as the 'wall flow' ceramic or silicon carbide carrier after the honeycomb holes at the inlet and outlet ends are ...

AI Technical Summary

Problems solved by technology

From the above information, it can be seen that FCC uses paper skeleton, not a mixed carrier of metal fibers, and no relevant patents have been retrieved.