Carbon monoxide room-temperature catalytic oxidation catalyst and preparation method thereof

A carbon monoxide and catalytic oxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. And other issues

Inactive Publication Date: 2009-05-06
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Au / TiO 2 It is an effective catalyst for indoor air purification at room temperature. Au / ZnO has excellent catalytic activity for catalytic oxidation of CO at room temperature, but the stability of the nano-Au catalyst is poor, and it is easy to deactivate during use. In addition, its preparation process is cumbersome and the cost is relatively high high, which limits its large-scale application
Palladium catalyst is also a commonly used CO oxidation catalyst at room temperature, PdCl 2 -CuCl 2 / C (Wacker type) catalyst has high catalytic activity, but it is easy to volatilize HCl during the reaction, which not only brings new pollution, but also shortens the life of the catalyst
[0003] Find through the retrieval to prior art, Chinese invention patent publication number CN1583258 has recorded that the disclosed palladium catalyst is carrier with activated carbon, and one or several elements in Li, K, P, Cu, V are additives, adopt step-by-step Prepared by impregnation method, the catalyst has high activity at room temperature, low precious metal content (accounting for 0.1-3% by weight of the carrier), long life, and good moisture resistance, but the removal of CO concentration is narrow (5-30ppm), and the activated carbon carrier needs to be Pretreatments such as acid boiling and water washing, etc., the prepared catalyst precursor needs to be wet-reduced at room temperature, filtered, and dried to obtain a catalyst or filtered, vacuum-dried, and hydrogen-reduced to obtain a catalyst. The steps are complicated and the cost is high. higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 0.00471 g of palladium nitrate and 0.0103 g of manganese nitrate and dissolve them in 0.45 ml of deionized water to prepare an impregnating solution, and add 0.5 g of 20-40 mesh Al 2 o 3 The carrier is placed in a small beaker and heated to 50-60°C in a water bath. At this temperature, the prepared impregnating solution is poured into the Al 2 o 3 In the carrier, soak for 1 hour. Then, it was dried at 120° C. for 4 hours and calcined at 550° C. for 3 hours to prepare the catalyst. Wherein PdO content is 0.5% (wt), MnO 2 The content is 1% (wt).

[0025] The catalytic performance of the prepared catalyst was evaluated according to the aforementioned test conditions, and the conversion rate of the catalyst to a small amount of carbon monoxide was 67.1%.

Embodiment 2

[0027] Weigh 0.00471 g of palladium nitrate and 0.0118 g of copper nitrate and dissolve them in 0.45 ml of deionized water to prepare an impregnation solution, and add 0.5 g of 20-40 mesh Al 2 o 3 The carrier is placed in a small beaker and heated to 50-60°C in a water bath. At this temperature, the prepared impregnating solution is poured into the Al 2 o 3 In the carrier, soak for 1 hour. Then, it was dried at 120° C. for 4 hours and calcined at 550° C. for 3 hours to prepare the catalyst. Wherein the PdO content is 0.5% (wt), and the CuO content is 1% (wt).

[0028] The catalytic performance of the prepared catalyst was evaluated according to the aforementioned test conditions, and the conversion rate of the catalyst to a small amount of carbon monoxide was 46.7%.

Embodiment 3

[0030] Weigh 0.00471 grams of palladium nitrate and 0.0081 grams of chromium nitrate dissolved in 0.45 milliliters of deionized water to prepare an impregnation solution, and 0.5 grams of 20-40 mesh Al 2 o 3 The carrier is placed in a small beaker and heated to 50-60°C in a water bath. At this temperature, the prepared impregnating solution is poured into the Al 2 o 3 In the carrier, soak for 1 hour. Then, it was dried at 120° C. for 4 hours and calcined at 550° C. for 3 hours to prepare the catalyst. Wherein the PdO content is 0.5% (wt), Cr 2 o 3 The content is 1% (wt).

[0031] The catalytic performance of the prepared catalyst was evaluated according to the aforementioned test conditions, and the conversion rate of the catalyst to a small amount of carbon monoxide was 52.5%.

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Abstract

The invention discloses a carbon monoxide oxidizing catalyst at normal temperature and a preparation method of the catalyst in the technical field of catalysts. The carbon monoxide oxidizing catalyst comprises active components, an addition agent and a catalyst carrier. The preparation method of the carbon monoxide oxidizing catalyst comprises following steps: palladium nitrate and heavy metallic nitrate are prepared to be a steeping fluid, the steeping fluid is poured into the catalyst carrier at preserved temperature so as to produce a catalyst precursor, and finally the catalyst precursor is dried and baked to obtain the catalyst. Compared with the prior art, the carbon monoxide oxidizing catalyst has better catalytic activity and stability, low preparation cost, and simple, convenient and popular preparation technique.

Description

technical field [0001] The invention relates to a catalyst in the technical field of chemical industry and a preparation method thereof, in particular to a carbon monoxide catalytic oxidation catalyst at room temperature and a preparation method thereof. Background technique [0002] CO is an important component of air pollutants and seriously endangers human health. Therefore, it is of great practical value to develop high-efficiency and low-cost CO low-temperature oxidation catalysts. At present, this type of catalyst has been widely used in air purification devices, CO gas sensors, gas masks, CO elimination in closed systems, and automobile exhaust control. Oxidation of CO to CO at room temperature 2 , there are a lot of research at home and abroad, and the catalysts used mainly include two types: non-precious metal catalysts and noble metal catalysts. Non-noble metal catalysts mainly use composite oxides or mixtures of transition metal elements with catalytic redox pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01J23/89B01J23/652C01B31/20C01B32/50
Inventor 姚炜周洁周莹张豪杰王玉东何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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