Platinum alloy knitted catalysis net for ammonia oxidation

A technology of knitted catalytic mesh and platinum alloy, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, nitric oxide, etc., to achieve good activity, low tear resistance and reduced use cost Effect

Inactive Publication Date: 2006-06-28
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies have promoted the technological progress of the nitric acid industry, but the high-temperature strength, catalytic activity, anti-poisoning ability and mechanical and physical properties of platinum-based alloys and catalytic nets can be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The elements of Pt, Pd, Rh, and Ce with a purity of 99.95% are formulated according to their content, and melted and cast into an alloy in a vacuum melting furnace. The content of each element is: Pd4%, Rh3%, Ce0.013%, and the balance of Pt.

[0016] The platinum-based alloy is drawn into filaments with a diameter of 0.08 mm, and warp knitting is carried out on a double-needle bed warp knitting machine. The transverse density is 18 holes / hour, the longitudinal density is 30-32 holes / hour, and the width is 2880 mm. The upper and lower mesh surfaces are connected with each needle of the same material and same diameter filaments to weave a three-layer three-dimensional structure mesh, and the thickness of the catalytic mesh is 2mm. The weight per unit area of ​​the catalytic net is: 2400-2600 g / m 2 , Made of catalytic mesh diameter 2875mm. Experimented on a normal pressure reaction furnace, the reaction temperature is 810°C, the use effect is good, the structure strength ...

Embodiment 2

[0018] The elements of Pt, Rh and Ce with a purity of 99.95% are prepared according to the content, and melted and cast into an alloy in a vacuum melting furnace. The content of each element is: Rh5%, Ce0.011%, Pt as the balance.

[0019] The platinum-based alloy is drawn into two kinds of filaments with a diameter of 0.076mm and 0.070mm, and warp knitting is carried out on a double-needle bed warp knitting machine. , the longitudinal density is 30-32 holes / inch, and the width is 1500mm. The same material is used between the upper and lower mesh surfaces, and the diameter is 0.076mm. Each needle is connected to form a three-layer three-dimensional structure mesh, and the thickness of the catalytic mesh is 2.5mm. The weight per unit area of ​​the catalytic net is: 1800-1900 g / m 2 , Made of catalytic mesh diameter 1490mm. Experimented on a medium-pressure reaction furnace, the reaction pressure is 0.5MPa, the reaction temperature is 880°C, the effect is good, the structure str...

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Abstract

A knitted multi-layer 3D catalyst net made of Pt-alloy wire (0.06-0.09 mm in diameter) features that said Pt alloy contains Pd (0-6 Wt%), Ph (2-10), Ce (0-0.015) and Pt (rest). It can be used for oxidizing ammonia to prepare nitric acid. Its advantages are high catalytic activity, high-temp strength and resistance against Pt poisoning, and large contact area.

Description

technical field [0001] The invention relates to a platinum alloy knitted catalytic net, in particular to a knitted catalytic net made of a platinum alloy for ammonia oxidation. Background technique [0002] In industrial production, the "three-step method" is generally used to produce nitric acid, that is, NH 3 Oxidation to NO, NO reoxidation to NO 2 , NO 2 By H 2 O uptake to generate HNO 3 . In the process of ammoxidation, PtRh and PtPdRh alloys have excellent high temperature chemical stability, and they are drawn into filaments and woven into plain weave nets to be used as catalysts. Because precious metals are expensive and resources are scarce, economical utilization, cost reduction and production efficiency improvement have become the goals pursued by nitric acid production. In recent years, scientific and technological workers from various countries have done a lot of work on the improvement of platinum-based alloy materials and catalytic network textures. In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/40B01J23/63B01J35/06C01B21/26
Inventor 赛兴鹏朱志恒王青
Owner SINO PLATINUM METALS CO LTD
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