WO2021258596A1 - 一种Pt/TiN高效光热协同催化剂及其制备方法与应用 - Google Patents

一种Pt/TiN高效光热协同催化剂及其制备方法与应用 Download PDF

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WO2021258596A1
WO2021258596A1 PCT/CN2020/124998 CN2020124998W WO2021258596A1 WO 2021258596 A1 WO2021258596 A1 WO 2021258596A1 CN 2020124998 W CN2020124998 W CN 2020124998W WO 2021258596 A1 WO2021258596 A1 WO 2021258596A1
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tin
catalyst
efficiency
synergistic catalyst
photothermal
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French (fr)
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丘勇才
靳小静
李安琦
邬鹏
赵帅奇
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华南理工大学
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/24—Nitrogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/39—Photocatalytic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0201—Impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/08—Heat treatment
    • B01J37/082—Decomposition and pyrolysis
    • B01J37/088—Decomposition of a metal salt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/80—Type of catalytic reaction
    • B01D2255/802—Photocatalytic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s

Definitions

  • the invention belongs to the field of nanotechnology and photothermal catalysis, and specifically relates to a Pt/TiN high-efficiency photothermal synergistic catalyst and a preparation method and application thereof.
  • VOCs volatile organic compounds
  • Thermal catalysis and photocatalysis are effective ways to treat VOCs.
  • Thermal catalysis is to provide energy to reach the activation energy required for the reaction by heating. This method has sufficient degradation and high efficiency, but the process consumes a lot of energy and the degradation cost is high, which is not conducive to sustainable development.
  • Solar energy is inexhaustible and inexhaustible. It is one of the most ideal energy sources. Therefore, the photocatalytic degradation of VOCs has attracted people's attention. However, the photocatalytic efficiency is low and secondary pollution is prone to occur. After years of research, there is still a gap between photocatalytic technology and actual large-scale application.
  • the photo-thermal synergistic catalytic purification of VOCs technology has attracted attention in recent years because of its green means of using solar energy to control environmental pollution and its excellent catalytic performance.
  • photothermal synergistic catalysis can not only use the two driving forces of light energy and heat energy at the same time, but also enhance the reaction efficiency through the synergistic effect produced.
  • the current technology of photothermal synergistic catalytic purification of VOCs is not yet mature.
  • Most of the reported photothermal catalysis only utilizes the thermal catalytic activity induced by photothermal, such as Chinese patent CN103331156A to prepare OMS-2 nanorod catalyst.
  • the same catalyst can perform photo-carrier catalysis + photo-thermal conversion + photo-thermal catalysis at the same time only under light conditions.
  • photo-thermal synergistic catalysis that integrates three functions. The main reason is that the relationship between the separation speed of photogenerated carriers and the temperature is one of the trade-offs. As the temperature increases, the thermal catalytic performance increases, and the photo-generated carrier recombination speed increases, and the photocatalytic performance decreases accordingly.
  • the catalyst regulate its thermal catalysis and photocatalytic activity, truly realize the photo-thermal synergistic catalytic performance and reach the maximum value, and improve the solar energy utilization efficiency.
  • TiN is an important new inorganic functional material developed in recent years. Its surface properties and catalytic properties are similar to those of platinum group noble metals, with good thermal conductivity and light-to-heat conversion properties. TiN nanoparticles have the properties of some metals, and can produce surface plasmon effects in the visible light waveband and longer wavebands. They have better stability, more economical price, and lower cost than previously reported photothermal conversion materials. Multiple advantages such as toxicity, wider and stronger light absorption. TiN calcination in the air will form a layer of TiO 2 on the surface (exhibiting photocatalytic performance), which acts as a carrier to support precious metals to reduce the reaction temperature and truly achieve high-efficiency photo-thermal synergistic catalytic activity.
  • the present invention aims to overcome the failure of the existing photothermal catalysts to efficiently realize the photothermal synergistic catalytic performance, and proposes a Pt/TiN high-efficiency photothermal synergistic catalyst and a preparation method and application thereof.
  • the catalyst has high efficiency and stability in catalytic activity.
  • the preparation method of the Pt/TiN high-efficiency photothermal synergistic catalyst provided by the present invention includes the following steps:
  • Adsorb Pt on the surface of TiN by dipping method add soluble Pt salt to the solvent and mix uniformly to obtain a soluble Pt salt solution; then add TiN to the soluble Pt salt solution, disperse uniformly by ultrasonic, soak and dry to obtain Precursor;
  • step (1) The precursor of step (1) is calcined in air to obtain the Pt/TiN high-efficiency photothermal catalyst.
  • step (1) is nano-particles with a particle size of 20-50 nm.
  • TiN is used as the carrier, and the soluble Pt salt is the precursor of Pt.
  • the soluble Pt salt in step (1) is chloroplatinic acid, potassium chloroplatinate, platinum nitrate or tetraammine platinum nitrate.
  • the mass percentage concentration of Pt is 0.1-1.0%.
  • the solvent in step (1) is ethanol or deionized water; the concentration of the soluble Pt salt solution is 0.2-2 mg/mL; the time for the ultrasonic dispersion treatment in step (1) is 30-60 min.
  • drying temperature in step (1) is 80-100° C.
  • drying time is 8-12 hours until the solvent is completely evaporated.
  • step (2) the calcination temperature of 200-500 o C, the calcination time was 20-60 min.
  • step (2) the calcination temperature of 350 o C, the calcination time was 1h.
  • the present invention provides a Pt/TiN high-efficiency photothermal synergistic catalyst prepared by the above-mentioned preparation method.
  • the application of the Pt/TiN high-efficiency photothermal synergistic catalyst provided by the present invention in the removal of volatile organic pollutants in ambient air can catalyze the decomposition of volatile organic pollutants under heating or light conditions.
  • volatile organic pollutants are more than one of toluene and benzene.
  • TiN is used as a carrier
  • Pt salt is a precursor of Pt
  • Pt is adsorbed on the surface of TiN by an impregnation method
  • the catalyst is obtained by roasting.
  • the present invention has the following advantages and beneficial effects:
  • the high-efficiency photothermal catalyst Pt/TiN prepared by the invention has a simple process and high repeatability; one-step air roasting oxidizes the surface layer of TiN particles into defect-rich TiO 2 for anchoring Pt; the prepared catalyst uses TiO 2 under light
  • the photocatalysis of Pt, the plasmon resonance of Pt, and the photothermal performance of TiN are coupled, showing efficient photothermal synergistic catalytic degradation of VOCs performance; when the initial concentration of toluene is 220 ppm, the mass space velocity is 72000 mL g -1 h -1 , the Pt’s With a loading of 1%, the catalyst temperature spontaneously rises to 100 ⁇ C after 12 minutes of light, the toluene degradation rate reaches 100%, and it has good stability, and its performance is significantly better than Pt/P25.
  • Figure 1 shows the 1.0Pt/TiNXRD patterns prepared in Examples 1-5 at different calcination temperatures
  • Figure 2 shows the XRD patterns of commercial TiN powders and catalysts with different Pt content prepared in Examples 1 and 6-8;
  • Figure 3 is the SEM image of the carrier commercial TiN nanopowder
  • Figure 4 is an SEM image of the 1.0Pt/TiN catalyst prepared in Example 1;
  • Figure 5 is a graph showing the catalytic degradation performance of toluene by the catalysts described in Comparative Example 1 and Example 1 under light conditions;
  • Fig. 6 is a graph showing the change in temperature of the catalyst of Example 1 with the change in light time under light conditions
  • Fig. 7 is a graph showing the catalytic oxidation performance of toluene of the catalyst described in Example 1 under contrast light conditions and under direct heating conditions.
  • Example 1 differ only in the firing temperature is 200 o C, other processes same as in Example 1, no longer tired here.
  • the catalyst prepared in this example is labeled 1.0Pt/TiN-200.
  • Example 1 differ only in the firing temperature is 300 o C, other processes same as in Example 1, where no longer tired.
  • the catalyst prepared in this example is labeled 1.0Pt/TiN-300.
  • Example 1 differ only in the calcination temperature to 400 o C, other processes same as in Example 1, where no longer tired.
  • the catalyst prepared in this example is labeled 1.0Pt/TiN-400.
  • Example 1 differ only in the roasting temperature is 500 o C, other processes same as in Example 1, where no longer tired.
  • the catalyst prepared in this example is labeled 1.0Pt/TiN-500.
  • Embodiment 1 The only difference from Embodiment 1 is that the addition amount of H 2 PtCl 6 is 265 ⁇ L, and the other processes are the same as Embodiment 1, and will not be repeated here.
  • the mass ratio of Pt:TiN is 0.5%, and the catalyst prepared in this example is labeled 0.5Pt/TiN.
  • Embodiment 1 The only difference from Embodiment 1 is that the addition amount of H 2 PtCl 6 is 106 ⁇ L, and the other processes are the same as Embodiment 1, and will not be repeated here.
  • the mass ratio of Pt:TiN is 0.2%, and the catalyst prepared in this example is labeled 0.2Pt/TiN.
  • Embodiment 1 The only difference from Embodiment 1 is that the added amount of H 2 PtCl 6 is 53 ⁇ L, and the other processes are the same as Embodiment 1, and will not be repeated here.
  • the mass ratio of Pt:TiN is 0.1%, and the catalyst prepared in this embodiment is labeled as 0.1Pt/TiN.
  • Example 1 The only difference from Example 1 is that the added amount of H 2 PtCl 6 is 5.3 mL, and the other processes are the same as those of Example 1, and will not be repeated here.
  • the mass ratio of Pt:TiN is 10%, and the catalyst prepared in this example is labeled 10Pt/TiN.
  • Embodiment 1 The only difference from Embodiment 1 is that commercial nano titanium dioxide P25 is used instead of TiN.
  • the other processes are the same as Embodiment 1, and will not be repeated here.
  • the mass ratio of Pt:TiN is 1%, and the catalyst prepared in this example is labeled 1.0Pt/P25.
  • the XRD patterns of the catalysts prepared in Examples 1-5 are shown in FIG. 1. It can be seen from Figure 1 that as the calcination temperature increases, the TiN part of the carrier is oxidized to anatase TiO 2 . When the calcination temperature is 350 o C, the surface of the TiN particles of the carrier is partially oxidized to anatase TiO 2 , while the inside is still TiN. When the firing temperature exceeds 350 o C, the TiN of the carrier is completely oxidized to TiO 2 . Thus the firing temperature is preferably 350 o C.
  • Figure 2 shows the XRD patterns of the catalysts prepared in Examples 1, 6, 7, and 8 and commercial TiN.
  • the catalysts prepared in Comparative Example 1 and Examples 1, 6, 8, and 9 were used to perform catalytic oxidation experiments on toluene.
  • the reaction conditions were as follows: the concentration of toluene was 220 ppm, the volume fraction of O 2 was 21%, N 2 was equilibrium gas, and air The speed is 72000mL g -1 h -1 , and the results obtained under light conditions are shown in Figure 5. It can be seen from Figure 5 that as the content of the loaded Pt increases, the catalytic performance improves.
  • the temperature was increased to 100 o C (as shown in Figure 6) after 12 minutes of illumination, and the degradation rate of toluene reached 100%, and it had good stability, and its performance was higher than that of the comparative example.
  • the catalytic reaction temperature of 1.0Pt/P25 to toluene under light conditions is lower, indicating that under light conditions The activation energy of the reaction can be reduced more effectively, and the photothermal synergistic catalytic effect can be realized.
  • the performance of 10Pt/TiN is the best, but taking into account the price and catalytic activity of the catalyst, 1.0Pt/TiN is preferred.

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Abstract

本发明公开了一种Pt/TiN高效光热协同催化剂及其制备方法与应用。该方法包括：以TiN为载体，Pt盐为Pt的前驱体，通过浸渍法将Pt吸附在TiN表面；焙烧得到所述催化剂。该催化剂制备简单，可重复性高，一步空气焙烧将TiN颗粒表面层氧化成富含缺陷的TiO 2用于锚定Pt。该催化剂在光照下将TiO 2光催化、Pt的等离子共振、TiN的光热转化性能耦合，显示出高效的光热协同催化降解VOCs性能。当甲苯初始浓度为220 ppm，质量空速72000 mL g -1h -1，Pt的负载量为1%，光照12min催化剂温度自发升至100˚C，甲苯降解率达100%，具有良好的稳定性，其性能明显优于Pt/P25。

Description

一种Pt/TiN高效光热协同催化剂及其制备方法与应用 技术领域
本发明属于纳米技术领域和光热催化领域，具体涉及一种Pt/TiN高效光热协同催化剂及其制备方法与应用。
 背景技术
挥发性有机物(VOCs)作为大气中的主要污染物来源，不仅对生态环境造成污染，而且严重危害人体健康。如何经济、环保、高效地净化VOCs是一个具有需求导向的重要课题。因此迫切需要发展高效净化VOCs新材料和新技术。热催化和光催化是治理VOCs的有效方式。热催化是通过加热的方式提供能量达到反应所需的活化能，该方法降解充分且效率高，但是过程耗能大，降解成本高，不利于可持续发展。太阳能取之不尽，用之不竭，是最理想的能源之一。因此，光催化降解VOCs得到了人们的关注。但光催化效率低且易产生二次污染。经过多年研究，光催化技术离实际大规模应用仍有差距。
光热协同催化净化VOCs技术因其利用太阳能治理环境污染的绿色手段及优异的催化性能近年来受到关注。相比单一的光催化或热催化技术，光热协同催化不仅能同时利用光能和热能两大反应推动力，还可通过产生的协同效应增强反应效率。但是，目前光热协同催化净化VOCs的技术尚不成熟。大部分已报道的光热催化只是利用了光致热引发的热催化活性，如中国专利CN103331156A制备OMS-2纳米棒催化剂。而同一个催化剂仅在光照条件下同时发挥光致载流子催化+光热转化+光致热催化，集三种功能于一体的光热协同催化至今鲜有报道。主要原因在于光生载流子的分离速度与温度的关系是此消彼长。随着温度升高，热催化性能提高，而光生载流子复合速度加快，光催化性能相应降低。合理设计催化剂，调控其热催化与光催化的催化活性，真正实现光热协同催化性能并达到最大值，提高太阳能利用效率。
TiN是近年来发展起来的一种重要新型无机功能材料，表面性质和催化性能与铂族贵金属相似，导热性能良好且具有光热转化性能。TiN纳米颗粒具有部分金属的性能，在可见光波段和更长的波段能够产生表面等离激元效应，具有比以往报道过的光热转换材料更好的稳定性、更经济的价格、更低的毒性、更宽更强的光吸收等多重优点。TiN在空气中焙烧会在表面形成一层TiO 2（发挥光催化性能），其作为载体负载贵金属可降低反应温度真正实现高效的光热协同催化活性。
技术解决方案
本发明旨在克服现有的光热催化剂未能高效实现光热协同催化性能，提出了一种Pt/TiN高效光热协同催化剂及其制备方法与应用。所述催化剂其催化活性高效、稳定。
本发明的目的至少通过如下技术方案之一实现。
本发明提供的Pt/TiN高效光热协同催化剂的制备方法，包括以下步骤：
（1）通过浸渍法将Pt吸附在TiN表面：将可溶性Pt盐加入溶剂中，混合均匀，得到可溶性Pt盐溶液；然后将TiN加入可溶性Pt盐溶液中，超声分散均匀，浸泡处理，干燥，得到前驱体；
（2）将步骤（1）所述前驱体在空气中焙烧即得到所述Pt/TiN高效光热催化剂。
进一步地，步骤（1）所述TiN为纳米颗粒，粒径为20-50 nm。步骤（1）中，以TiN为载体，可溶性Pt盐为Pt的前驱体。
进一步地，步骤（1）所述可溶性Pt盐为氯铂酸、氯铂酸钾、硝酸铂或四氨合硝酸铂。
进一步地，步骤（1）所述前驱体中，Pt的质量百分比浓度为0.1-1.0%。
进一步地，步骤（1）所述溶剂为乙醇或去离子水；所述可溶性Pt盐溶液的浓度为0.2-2 mg/mL；步骤（1）所述超声分散处理的时间为30-60min。
进一步地，步骤（1）所述干燥的温度为80-100℃，干燥的时间为8-12h直到溶剂蒸发完全。
进一步地，步骤（2）所述焙烧的温度为200-500 oC，焙烧的时间为20-60 min。
优选地，步骤（2）所述焙烧的温度为350 oC，焙烧的时间为1h。
本发明提供一种由上述的制备方法制得的Pt/TiN高效光热协同催化剂。
本发明提供的Pt/TiN高效光热协同催化剂在去除环境空气中挥发性有机污染物中的应用，在加热或光照的状态下催化分解挥发性有机污染物。
进一步地，所述挥发性有机污染物为甲苯及苯中的一种以上。
本发明以TiN为载体，Pt盐为Pt的前驱体，通过浸渍法将Pt吸附在TiN表面；焙烧得到所述催化剂。
 有益效果
与现有技术相比，本发明具有如下优点和有益效果：
本发明制备的高效光热催化剂Pt/TiN工艺简单，可重复性高；一步空气焙烧将TiN颗粒表面层氧化成富含缺陷的TiO 2用于锚定Pt；制备的催化剂在光照下将TiO 2的光催化、Pt的等离子共振、TiN的光热性能耦合，显示出高效的光热协同催化降解VOCs性能；当甲苯初始浓度为220 ppm，质量空速72000 mL g -1h -1，Pt的负载量为1%，光照12min催化剂温度自发升至100˚C，甲苯降解率达100%，且具有良好的稳定性，其性能明显优于Pt/P25。
附图说明
图1为实施例1-5在不同的焙烧温度下制备的1.0Pt/TiNXRD图；
图2为商业化TiN粉末及实施例1、实施例6-8制备的不同Pt含量催化剂的XRD图；
图3为载体商业化TiN纳米粉末的SEM图；
图4为实施例1制备得到的1.0Pt/TiN催化剂的SEM图；
图5为光照条件下对比例1和实施例1中所述催化剂进行甲苯催化降解性能图；
图6为光照条件下实施例1的催化剂温度变化随光照时间变化图；
图7为对比光照条件下与直接加热条件下实施例1中所述催化剂的甲苯催化氧化性能图。
 本发明的实施方式
以下结合实例对本发明的具体实施作进一步说明，但本发明的实施和保护不限于此。需指出的是，以下若有未特别详细说明之过程，均是本领域技术人员可参照现有技术实现或理解的。所用试剂或仪器未注明生产厂商者，视为可以通过市售购买得到的常规产品。
实施例 1
（1）量取530 µL 10 mg mL -1的H 2PtCl 6水溶液于6 mL乙醇溶液中，加入0.2g商业纳米级TiN（粒径为20-50 nm），其中Pt：TiN质量比为1%，超声分散60 min，100 oC加热10 h至溶剂蒸发样品干燥。
（2）将上述收集的固体粉末研磨均匀，转入马弗炉中350 oC焙烧1 h，得到所述1.0Pt/TiN-350催化剂。
实施例 2
与实施例1仅区别在焙烧温度为200 oC，其他工艺与实施例1相同，此处不再累述。该实施例制备得到的催化剂标记为1.0Pt/TiN-200。
实施例 3
与实施例1仅区别在焙烧温度为300 oC，其他工艺与实施例1相同，此处不再累述。该实施例制备得到的催化剂标记为1.0Pt/TiN-300。
实施例 4
与实施例1仅区别在焙烧温度为400 oC，其他工艺与实施例1相同，此处不再累述。该实施例制备得到的催化剂标记为1.0Pt/TiN-400。
实施例 5
与实施例1仅区别在焙烧温度为500 oC，其他工艺与实施例1相同，此处不再累述。该实施例制备得到的催化剂标记为1.0Pt/TiN-500。
实施例 6
与实施例1仅区别在于H 2PtCl 6加入量为265 µL，其他工艺与实施例1相同，此处不再累述。其Pt：TiN质量比为0.5%，该实施例制备得到的催化剂标记为0.5Pt/TiN。
实施例 7
与实施例1仅区别在于H 2PtCl 6加入量为106µL，其他工艺与实施例1相同，此处不再累述。其Pt：TiN质量比为0.2%，该实施例制备得到的催化剂标记为0.2Pt/TiN。
实施例 8
与实施例1仅区别在于H 2PtCl 6加入量为53 µL，其他工艺与实施例1相同，此处不再累述。其Pt：TiN质量比为0.1%，该实施例制备得到的催化剂标记为0.1Pt/TiN。
实施例 9
与实施例1仅区别在于H 2PtCl 6加入量为5.3 mL，其他工艺与实施例1相同，此处不再累述。其Pt：TiN质量比为10%，该实施例制备得到的催化剂标记为10Pt/TiN。
对比例 1
与实施例1仅区别在于用商业化纳米二氧化钛P25替代TiN，其他工艺与实施例1相同，此处不再累述。其Pt：TiN质量比为1%，该实施例制备得到的催化剂标记为1.0Pt/P25。
实施例1-5制备得到的催化剂的XRD图谱如图1所示。从图1中可以看出，随着焙烧温度升高，载体TiN部分被氧化成锐钛矿TiO 2。当焙烧温度为350 oC时，载体TiN颗粒表面部分氧化成锐钛矿TiO 2，而内部依然是TiN。当焙烧温度超过350 oC，载体TiN全部氧化成TiO 2。因此焙烧温度优选为350 oC。图2所示实施例1、6、7、8制备得到的催化剂及商业化TiN的XRD图谱。随着氯铂酸量的增加，XRD图谱中Pt的峰越发明显，表明实施例1-4最终制备的产物中含有Pt、TiO 2、TiN。商业化TiN纳米粉末和实施例1制备得到的催化剂的SEM图像如图3，图4所示，可以看出纯TiN的粒径为20~50 nm的纳米颗粒，负载Pt之后，1.0Pt/TiN仍旧保持20~50 nm的纳米颗粒，说明Pt很均匀地分散在载体表面。
采用对比例1及实施例1、6、8、9制备的催化剂对甲苯进行催化氧化实验，反应条件：甲苯的浓度为220 ppm，O 2的体积分数为21%，N 2为平衡气，空速72000mL g -1h -1，光照条件下所得结果如图5所示。从图5可以看出，随着负载Pt含量的增多，催化性能提升。实施例1制备的1.0Pt/TiN催化剂处理甲苯时，光照12min，温度升至100 oC（如图6所示），甲苯降解率达100%，且具有良好的稳定性，性能高于对比例中的1.0Pt/P25催化剂；且在相同的转化率时，相比于图7中所示直接加热条件下，光照条件下1.0Pt/P25对甲苯的催化反应温度较低，说明在光照条件下可以更有效降低该反应活化能，实现光热协同的催化效果。虽然10Pt/TiN的性能最好，但兼顾催化剂的价格及催化活性，优选1.0Pt/TiN为佳。
以上实施例仅为本发明较优的实施方式，仅用于解释本发明，而非限制本发明，本领域技术人员在未脱离本发明精神实质下所作的改变、替换、修饰等均应属于本发明的保护范围。

Claims (10)

  1. 一种Pt/TiN高效光热协同催化剂的制备方法，其特征在于，包括以下步骤：
    （1）将可溶性Pt盐加入溶剂中，混合均匀，得到可溶性Pt盐溶液；然后将TiN加入可溶性Pt盐溶液中，超声分散处理，干燥，得到前驱体；
    （2）将步骤（1）所述前驱体在空气中焙烧即得到所述Pt/TiN高效光热催化剂。
  2. 根据权利要求1所述的Pt/TiN高效光热协同催化剂的制备方法，其特征在于，步骤（1）所述TiN为纳米颗粒，粒径为20-50 nm。
  3. 根据权利要求1所述的Pt/TiN高效光热协同催化剂的制备方法，其特征在于，步骤（1）所述可溶性Pt盐为氯铂酸、氯铂酸钾、硝酸铂或四氨合硝酸铂。
  4. 根据权利要求1所述的Pt/TiN高效光热协同催化剂的制备方法，其特征在于，步骤（1）所述前驱体中，Pt的质量百分比浓度为0.1-1.0%。
  5. 根据权利要求1所述的Pt/TiN高效光热协同催化剂的制备方法，其特征在于，步骤（1）所述溶剂为乙醇或水；所述可溶性Pt盐溶液的浓度为0.2-2 mg/mL；所述超声分散处理的时间为30-60min。
  6. 根据权利要求1所述的Pt/TiN高效光热协同催化剂的制备方法，其特征在于，步骤（1）所述干燥的温度为80-100 oC，干燥的时间为8-12h。
  7. 根据权利要求1所述的Pt/TiN高效光热协同催化剂的制备方法，其特征在于，步骤（2）所述焙烧的温度为200-500 oC，焙烧的时间为20-60 min。
  8. 一种由权利要求1-7任一项所述的制备方法制得的Pt/TiN高效光热协同催化剂。
  9. 权利要求8所述的Pt/TiN高效光热协同催化剂在去除环境中挥发性有机污染物中的应用，其特征在于，在加热或光照的状态下催化分解挥发性有机污染物。
  10. 根据权利要求9所述的Pt/TiN高效光热协同催化剂在去除环境中挥发性有机污染物中的应用，其特征在于，所述挥发性有机污染物为甲苯及苯中的一种以上。
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