Foam metal carrier with high specific surface area and preparation process thereof

Abstract

The invention relates to a foam metal carrier with a high specific surface area. The foam metal carrier is characterized in that: the foam metal carrier is subjected to dip coating of mixed liquor before being calcined, wherein the mixed liquor is formed by mixing and continuously stirring 10 to 15 weight percent of industrial asphalt, 5 to 10 weight percent of industrial nano titanium dioxide powder with average particle sizes of 100 nm and 75 to 85 weight percent of kerosene for 10 to 20 min. The foam metal carrier has the advantages of improving bulk density, reducing oxidation on the surface of the foam metal, improving intensity, increasing specific surface area, improving catalytic efficiency, reducing cost, reducing production potential safety and improving heat treatment process of finished products.

Description

technical field [0001] The invention relates to a foamed metal carrier with a high specific surface area and a preparation process, which is applied to the SCR and POC post-treatment industries of automobile exhaust. Background technique [0002] At present, the world is facing comprehensive challenges of energy and environment. In the selection of technical means to meet the emission standards of traditional vehicles, people still face many difficulties, for example, how to choose the carrier and catalyst for post-treatment. [0003] The post-processing carrier is the key factor to constitute the vehicle after-processing platform. Up to now, most of the post-processing carriers are imported ceramic carriers. Similarly, the mature metal carrier is also monopolized by foreign technology and patents, which has become a key factor restricting the development of China's post-processing industry. [0004] Therefore, how to obtain low-cost and high-performance post-processing ca...

AI Technical Summary

Problems solved by technology

However, since iron is easily oxidized at high temperature, the strength of iron in the skeleton will be reduced by more than 70% after oxidation, or it will simply become a waste product. Therefore, in the calcination of foam metal, it is necessary to use atmosphere protection or hydrogen for reduction.

[0009] The search found a lot of patents on metal foam electrodeposition or preparation process, and some patents include the hydrogen atmosphere reduction in the final calcination process, but there is no patent application with the same patent as this patent. For example, the patent application number is CN201010100422.8's patent of 'titanium-based quaternary catalytic foam metal carrier and its manufacturing method' is to use titanium and titanium alloy smelting to obtain a foamed titanium metal material with a three-dimensional fiber structure; the patent application number is CN200810068869.4's 'plastic-based metal foam The patented method is to immerse the plastic-based foam in a low-temperature thermosetting polymer silver paste or spray the low-temperature thermosetting polymer silver paste onto the plastic-based foam, so that the fibers of the plastic-based foam adhere to the conductive layer, and then It is prepared by electroplating; the patent application number is CN200610117833.1 'Foamed Fe-Cr-Al and Its Manufacturing Process Applied to Exhaust Gas Filtration and Catalyst Carrier' patent, the foamed Fe-Cr-Al is based on foamed metal, Flame spraying iron-chromium-aluminum on the porous surface of the base material; patent application number CN200510032174.7 'Three-dimensional through holes or part of the holes connected to each other porous metal foam and its preparation method' patent is to combine one or more particle sizes in 1 ~100μm metal or alloy powder is evenly dispersed in a solution containing a binder to make a slurry, and then the slurry is poured into a through-hole polyurethane sponge foam, dried and sintered to obtain a three-dimensional through-hole foam metal material; patent application No. CN03208577.X's 'composite metal porous aluminum' patent is a three-dimensional network structure composed of foam metal skeleton, and the hot-dip aluminum method is used to compound metal aluminum on the skeleton; the patent application number is CN00133631.2 'a Composite metal foam and its preparation method' patent is to first prepare the conductive layer from the foam material, deposit metal (A) on the foam material by means of electrodeposition, and then deposit another metal (B) on the surface of the metal (A). After heat treatment, a composite metal foam is formed; the patent application number is CN02129612.X 'a composite metal porous body and its preparation method' patent first uses the foam material as the core membrane, and deposits one, or two, Or two or more metals to prepare porous metal or porous alloy; then use porous metal or porous alloy as the skeleton, and use the hot dipping method to hot-dip the metal or alloy on the skeleton to prepare a composite metal porous body

[0010] In the traditional metal foam calcination process, the hydrogen atmosphere reduction process is required, which requires a sophisticated calcination furnace and production control technology, for example, a 70% nitrogen + 30% hydrogen mixture gas is introduced into the furnace, and in the furnace body Forming a micro-positive pressure (0.05~0.1kg / cm2) system, it is obvious that it has safety problems. In addition, the cost of the calciner for hydrogen reduction and the cost of process materials are relatively high

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