阅读说明：本技术 一种用于消除挥发性有机物的催化剂及其制备方法 (Catalyst for eliminating volatile organic compounds and preparation method thereof ) 是由 罗声宏 金凌云 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种用于消除挥发性有机物的催化剂及其制备方法,催化剂由载体、活性组分和助剂组成,载体是Nb<Sub>2</Sub>O<Sub>5</Sub>-Al<Sub>2</Sub>O<Sub>3</Sub>-CeVO<Sub>4</Sub>；活性组分为Pt；助剂为MoO<Sub>3</Sub>；Nb<Sub>2</Sub>O<Sub>5</Sub>-Al<Sub>2</Sub>O<Sub>3</Sub>-CeVO<Sub>4</Sub>载体是通过CeVO<Sub>4</Sub>负载Nb<Sub>2</Sub>O<Sub>5</Sub>和Al<Sub>2</Sub>O<Sub>3</Sub>来制备,Nb<Sub>2</Sub>O<Sub>5</Sub>/Al<Sub>2</Sub>O<Sub>3</Sub>质量比＝1：0.1-2,Nb<Sub>2</Sub>O<Sub>5</Sub>-Al<Sub>2</Sub>O<Sub>3</Sub>负载量为CeVO<Sub>4</Sub>的2-6wt％；活性组分Pt和助剂MoO<Sub>3</Sub>是通过乙酰丙酮铂(II)和乙酰丙酮钼负载到Nb<Sub>2</Sub>O<Sub>5</Sub>-Al<Sub>2</Sub>O<Sub>3</Sub>-CeVO<Sub>4</Sub>载体来制备,Pt负载量为0.3wt％,Pt/MoO<Sub>3</Sub>的质量比为1：(0.5-3)。催化剂对苯、甲苯、乙酸乙酯、丙酮、正己醇、乙醚均具有很高的反应活性。(The invention discloses a catalyst for eliminating volatile organic compounds and a preparation method thereof, the catalyst consists of a carrier, an active component and an auxiliary agent, wherein the carrier is Nb 2 O 5 ‑Al 2 O 3 ‑CeVO 4 (ii) a The active component is Pt; the auxiliary agent is MoO 3 ；Nb 2 O 5 ‑Al 2 O 3 ‑CeVO 4 The carrier is through CeVO 4 Loaded Nb 2 O 5 And Al 2 O 3 To prepare Nb 2 O 5 /Al 2 O 3 The mass ratio is 1: 0.1-2，Nb 2 O 5 ‑Al 2 O 3 The load is CeVO 4 2-6 wt% of (A); active component Pt and auxiliary agent MoO 3 Is carried to Nb by acetylacetone platinum (II) and molybdenum 2 O 5 ‑Al 2 O 3 ‑CeVO 4 Prepared from the carrier, Pt loading 0.3 wt%, Pt/MoO 3 The mass ratio of (1): (0.5-3). The catalyst has high reaction activity on benzene, toluene, ethyl acetate, acetone, n-hexanol and diethyl ether.)

1. A catalyst for eliminating volatile organic compounds, comprising: the catalyst consists of a carrier, an active component and an auxiliary agent, wherein the carrier is Nb₂O₅-Al₂O₃-CeVO₄The active component is Pt, and the auxiliary agent is MoO₃，Nb₂O₅-Al₂O₃-CeVO₄The carrier is through CeVO₄Loaded Nb₂O₅And Al₂O₃To prepare Nb₂O₅/Al₂O₃The mass ratio is 1: 0.1-2, Nb₂O₅-Al₂O₃The load is CeVO₄2-6 wt% of (A), active component Pt and auxiliary agent MoO₃Is carried to Nb by acetylacetone platinum (II) and molybdenum₂O₅-Al₂O₃-CeVO₄Prepared from the carrier, Pt loading 0.3 wt%, Pt/MoO₃The mass ratio of (1): (0.5-3).

2. A preparation method of a catalyst for eliminating volatile organic compounds is characterized by comprising the following steps:

(1)Nb₂O₅-Al₂O₃-CeVO₄preparation of the support

According to Nb₂O₅/Al₂O₃The mass ratio of (1): (0.1-2), wherein Nb₂O₅And Al₂O₃The total mass of (A) is CeVO₄2-6 percent of the total weight of the composition. Weighing corresponding niobium hydroxide (H)₅Nb₃O₁₀) And aluminum nitrate nonahydrate (Al (NO)₃)₃·9H₂O) mixing with water, adding CeVO₄Then dried at 120 ℃, and finally roasted for 4 hours at 500 ℃ in air atmosphere to prepare Nb₂O₅-Al₂O₃-CeVO₄And (3) a carrier.

(2)Pt-MO₃/Nb₂O₅-Al₂O₃-CeVO₄Preparation of the catalyst

According to the Pt loading amount of Nb₂O₅-Al₂O₃-CeVO₄0.3 wt% of support, Pt/MoO₃The mass ratio of (1): (0.5-3), preparing corresponding DMF solution of platinum (II) acetylacetonate and DMF solution of molybdenum acetylacetonate, mixing, and adding Nb₂O₅-Al₂O₃-CeVO₄Heating to 80 deg.C with stirring to volatilize DMF solvent, and adding N₂Calcining at 400 deg.C for 4 hr. Then roasting for 4 hours at 400 ℃ in air atmosphere to obtain Pt-MO₃/Nb₂O₅-Al₂O₃-CeVO₄A catalyst.

Technical Field

The invention relates to a chemical catalyst and a preparation method thereof, in particular to a catalyst for eliminating Volatile Organic Compounds (VOCs) and a preparation method thereof.

Background

Volatile Organic Compounds (VOCs) are a common class of atmospheric pollutants that are complex in composition and are highly harmful to humans and the environment. The volatile organic compounds relate to the industries of petrochemical industry, dye, pharmacy, plastics, leather and the like. These organic compounds are generally inhaled by the human body in the form of vapor or enter the human body through skin contact, have a great toxic effect on the human body, and may cause cancer and other serious diseases. More importantly, viruses and germs can survive on the small particles, attach to the particles in the atmosphere, transmit diseases, and pollute the atmospheric environment. Therefore, it is important to strictly control the emissions of VOCs.

At present, methods for removing Volatile Organic Compounds (VOCs) include adsorption methods, photocatalytic methods, direct combustion methods, catalytic combustion methods, and the like. The catalytic oxidation technology is widely researched and applied due to the characteristics of low energy consumption, simple operation, high purification efficiency and the like. The noble metal catalyst is a typical catalyst for VOCs catalytic combustion, and Pt is an active component of a common VOCs combustion catalyst; in addition, Pt is a good hydrogenation, reforming, dehydrogenation catalyst, and also a typical diesel exhaust oxidation (DOC) catalyst, indicating that Pt is a very good catalyst for alkane activation and oxidation.

Patent CN109821536A discloses a catalyst for complete oxidation of propane and a preparation method thereof, wherein the catalyst is Pt-V₂O₅/SnO₂-Nb₂O₅The conversion rate of propane at 305 ℃ can reach 99.9 percent, and the catalytic performance is stable. Patent CN107537524A discloses a catalyst for complete oxidation of propane and a preparation method thereof, wherein the catalyst is Pt-Pd/SnO₂/AlF₃C, the conversion rate of propane at 275 ℃ can reach 99.9%, and the catalyst has the characteristics of simple preparation, good stability and the like. Although the above catalyst has good performance, the noble metal loading in the catalyst reaches 2 wt%, and the catalyst is expensive.

Disclosure of Invention

The invention aims to provide a catalyst for eliminating volatile organic compounds and a preparation method thereof, wherein the catalyst has the advantages of low content of noble metal Pt, high reaction activity and stable performance.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the catalyst for eliminating volatile organic matter consists of carrier, active component and assistant, and the carrier is Nb₂O₅-Al₂O₃-CeVO₄(ii) a The active component is Pt; the auxiliary agent is MoO₃；Nb₂O₅-Al₂O₃-CeVO₄The carrier is through CeVO₄Loaded Nb₂O₅And Al₂O₃To prepare Nb₂O₅/Al₂O₃The mass ratio is 1: 0.1-2, Nb₂O₅-Al₂O₃The load is CeVO₄2-6 wt% of (A); active component Pt and auxiliary agent MoO₃Is carried to Nb by acetylacetone platinum (II) and molybdenum₂O₅-Al₂O₃-CeVO₄Prepared from the carrier, Pt loading 0.3 wt%, Pt/MoO₃The mass ratio of (1): (0.5-3).

A preparation method of a catalyst for eliminating volatile organic compounds comprises the following steps:

(1)Nb₂O₅-Al₂O₃-CeVO₄preparation of the support

According to Nb₂O₅/Al₂O₃The mass ratio of (1): (0.1-2), wherein Nb₂O₅And Al₂O₃The total mass of (A) is CeVO₄2-6 percent of the total weight of the composition. Weighing corresponding niobium hydroxide (H)₅Nb₃O₁₀) And aluminum nitrate nonahydrate (Al (NO)₃)₃·9H₂O) mixing with water, adding CeVO₄Then dried at 120 ℃, and finally roasted for 4 hours at 500 ℃ in air atmosphere to prepare Nb₂O₅-Al₂O₃-CeVO₄And (3) a carrier.

(2)Pt-MO₃/Nb₂O₅-Al₂O₃-CeVO₄Preparation of the catalyst

According to the Pt loading amount of Nb₂O₅-Al₂O₃-CeVO₄0.3 wt% of support, Pt/MoO₃The mass ratio of (1): (0.5-3), preparing corresponding DMF solution of platinum (II) acetylacetonate and DMF solution of molybdenum acetylacetonate, mixing, and adding Nb₂O₅-Al₂O₃-CeVO₄Heating to 80 deg.C with stirring to volatilize DMF solvent, and adding N₂Calcining at 400 deg.C for 4 hr. Then roasting for 4 hours at 400 ℃ in air atmosphere to obtain Pt-MO₃/Nb₂O₅-Al₂O₃-CeVO₄A catalyst.

In summary, the present invention employs Nb₂O₅-Al₂O₃/CeVO₄As a carrier, MoO₃The catalyst is a catalyst auxiliary agent, and Pt is an active component, and provides a catalyst for completely oxidizing VOCs (volatile organic compounds) with low Pt content of noble metal and high catalytic performance and a preparation method thereof. The catalyst prepared by the technical scheme can be used for purifying volatile organic waste gas at a lower temperature range, and has high reaction activity on benzene, toluene, ethyl acetate, acetone, n-hexyl alcohol and diethyl ether.

Detailed Description

The present invention will be described in further detail with reference to examples. But the scope of the implementation is not limited to the examples given.