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Ultralow noble metal content catalyst and preparation method and application thereof

A precious metal and catalyst technology, applied in the field of ultra-low precious metal content catalyst and its preparation, can solve the problems of short service life, large loading capacity, poor deactivation resistance, etc., and achieve long service life, strong deactivation resistance, good The effect of catalytic activity

Inactive Publication Date: 2020-08-07
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the existing noble metal catalysts, which have large loading capacity, poor deactivation resistance, short service life, and failure to deal with low-concentration formaldehyde, and provide a catalyst with ultra-low noble metal content preparation method

Method used

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  • Ultralow noble metal content catalyst and preparation method and application thereof
  • Ultralow noble metal content catalyst and preparation method and application thereof
  • Ultralow noble metal content catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A preparation method of an ultra-low noble metal content catalyst, comprising the steps of:

[0040] S1. Preparation of carrier R-TiO 2 : Sodium borohydride and TiO 2 After mixing, keep at 300 °C for 30 min to remove unreacted sodium borohydride to obtain the carrier R-TiO 2 , the mass ratio of sodium borohydride and P25 is 1:4

[0041] S2. Preparation of ultra-low precious metal content catalyst: weigh 1g carrier R-TiO 2 , 0.0025gPd(NO 3 ) 2 Mix and stir after dissolving, NaBH 4 solution was added to the mixture solution (nNaBH 4 / nPd=20:1), reduction for 2 hours, the reduction temperature is 25°C, after the stirring is completed, the mixture is dried in a water bath at 80°C, and the obtained powder is dried overnight at 80°C, and the obtained catalyst is recorded as 0.1 Pd / R-TiO 2 , Pd loading is 0.1% by mass.

Embodiment 2

[0043] A preparation method of an ultra-low noble metal content catalyst, comprising the steps of:

[0044] S1. Preparation of carrier R-TiO 2 : Sodium borohydride and TiO 2 After mixing, keep at 300 °C for 30 min to remove unreacted sodium borohydride to obtain the carrier R-TiO 2 , the mass ratio of sodium borohydride and P25 is 1:4

[0045] S2. Preparation of ultra-low precious metal content catalyst: weigh 1g carrier R-TiO 2 , 0.0063gPd(NO 3 ) 2 Mix and stir after dissolving. After the stirring is completed, the mixture is dried in a water bath at 80°C. After drying the obtained powder at 80°C overnight, it is subjected to hydrogen reduction treatment at 300°C for 30 minutes, and the gas flow rate is 500mL / min. The catalyst is recorded as 0.25Pd / R-TiO 2 , Pd loading is 0.25% by mass.

Embodiment 3

[0047] A preparation method of an ultra-low noble metal content catalyst, comprising the steps of:

[0048] S1. Preparation of carrier R-TiO 2 : Sodium borohydride and TiO 2 After mixing, keep at 300 °C for 30 min to remove unreacted sodium borohydride to obtain the carrier R-TiO 2 , the mass ratio of sodium borohydride and P25 is 1:4

[0049] S2. Preparation of ultra-low precious metal content catalyst: weigh 1g carrier R-TiO 2 , 0.0125gPd(NO 3 ) 2 Mix and stir after dissolving. After the stirring is completed, the mixture is dried in a water bath at 80°C. After drying the obtained powder at 80°C overnight, it is subjected to hydrogen reduction treatment at 300°C for 30 minutes, and the gas flow rate is 500mL / min. The catalyst is recorded as 0.5Pd / R-TiO 2 , Pd loading is 0.5% by mass.

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Abstract

The invention discloses an ultralow noble metal content catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a reducing agentand TiO2, and reducing to prepare a carrier R-TiO2; dissolving the carrier R-TiO2 and noble metal salt, mixing and stirring, and reducing the noble metal salt into elemental metal, so as to obtain M / R-TiO2. The preparation method comprises carrying out defect site modification on a carrier TiO2, so the excellent removal effect on the low-concentration formaldehyde can be realized under the extremely low loading capacity, and the removal efficiency is up to 100%, and the formaldehyde removal efficiency is up to 100% under the conditions of temperature of 10-40 DEG C and humidity of 30-70%; theinvention has remarkable treatment effect on low-concentration formaldehyde, medium-concentration formaldehyde and high-concentration formaldehyde, has good stability, strong inactivation resistance,long service life and industrial application capability, and can be widely applied to catalytic oxidation of indoor formaldehyde.

Description

technical field [0001] 本发明涉及催化剂制备技术领域,更具体地,涉及一种超低贵金属含量催化剂及其制备方法和应用。 Background technique [0002] 甲醛(HCHO)被认为是室内环境中广泛存在的有害气体污染物,长期暴露在含有甲醛的室内空气中,即使浓度很低,也会导致严重的健康问题,包括鼻腔肿瘤、眼睛和呼吸道粘膜刺激、皮肤刺激、浓度降低和免疫力下降,因此为了降低公共健康风险,室内空气中甲醛的去除极其重要。催化氧化法是一种去除甲醛的常用方法,主要包括贵金属和非贵金属两大类。贵金属催化剂较非贵金属催化剂具有更好的低温催化氧化甲醛的特性,但其成本较高。 [0003] 现有的甲醛催化剂主要有Na掺杂的Pd / TiO 2 催化剂和Mn掺杂的Pt / TiO 2 催化剂等。Na掺杂的Pd / TiO 2 催化剂的制备方法通常包括如下步骤:(1)将TiO 2 与NaNO 3 、与Pd(NO 3 ) 2 水溶液共浸渍;(2)浸渍后,在60℃的旋转蒸发仪中除去多余的水;(3)将样品在110℃干燥过夜,然后在400℃煅烧2小时;(4)将样品在350℃下用H 2 还原30分钟。其样品需要在400℃下煅烧,350℃下还原,还原温度高,能源消耗大,Pd的负载量为1%,贵金属含量较高,成本较高。Mn掺杂的Pt / TiO 2 催化剂的制备方法通常包括如下步骤:(1)在剧烈搅拌下将10g TiOSO 4 和0.5g KMnO 4 溶解在500mL去离子水中;(2)将(1)所得溶液转移至高压釜中,并在160℃加热24h;(3)将获得的绿色固体过滤并用水洗涤,最后将粉末在450℃下煅烧4小时,得到载体Mn-TiO 2 ;(4)将2g Mn-TiO 2 超声分散在100mL含0.051mmol H 2 PtCl 6 的水溶液中以获得悬浮液;(5)用20mL水稀释0.5g H 2 o 2 (30wt%),然后在60℃下剧烈搅拌下滴加到上述悬浮液中;(6)过滤所得固体,用水洗涤并在110℃下干燥过夜;(7)最后,将得到的粉末在350℃下用纯H 2 处理4小时。在Pt含量较低的情况下,如0.1和0.3wt%的Pt / Mn-TiO 2 催化剂几乎没有催化活性;在质量空速为6000mL / (g.h)的条件下进行活性测试,测试条...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01D53/86B01D53/72
CPCB01D53/8668B01J23/42
Inventor 黄海保俞乐怡纪建
Owner SUN YAT SEN UNIV
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