Search

CN-122006792-A - Sulfur-resistant water-resistant catalyst for efficient removal CVOCs and preparation method and application thereof

CN122006792ACN 122006792 ACN122006792 ACN 122006792ACN-122006792-A

Abstract

The invention discloses a catalyst for sulfur-resistant water-resistant efficient removal CVOCs and a preparation method and application thereof, belonging to the field of air pollution purification. The preparation method of the catalyst for sulfur-resistant water-resistant efficient removal CVOCs comprises the following steps of S1 roasting a molecular sieve at high temperature, cooling, S2 weighing a noble metal precursor and a transition metal precursor according to a proportion respectively to prepare a mixed aqueous solution, S3 mixing and exchanging the molecular sieve treated in the step S1 with the mixed aqueous solution, washing and suction filtering, and drying and roasting solids to obtain the catalyst for sulfur-resistant water-resistant efficient removal CVOCs. The catalyst prepared by the invention has excellent water resistance and SO 2 poisoning resistance, has high-efficiency low-temperature catalytic activity, and can perform high-efficiency catalytic conversion on chlorobenzene.

Inventors

  • LI GUOBO
  • PENG HONGGEN
  • HU YINGXIN
  • YUAN JINGYUN
  • SHEN QI

Assignees

  • 南昌大学

Dates

Publication Date
20260512
Application Date
20260130

Claims (10)

  1. 1. The preparation method of the catalyst for sulfur-resistant water-resistant efficient removal CVOCs is characterized by comprising the following steps of: s1, roasting a molecular sieve at a high temperature, and cooling; s2, respectively weighing a noble metal precursor and a transition metal precursor according to a proportion to prepare a mixed aqueous solution; S3, mixing and exchanging the molecular sieve treated in the step S1 with the mixed aqueous solution, washing and filtering, drying and roasting the solid to obtain the catalyst with sulfur resistance and water resistance and high-efficiency removal CVOCs.
  2. 2. The method according to claim 1, wherein in step S1, The silicon-aluminum ratio of the molecular sieve is 1-100; The molecular sieve comprises at least one of H-beta and H-ZSM-5; the high-temperature roasting temperature is 300-400 ℃ and the time is 2-3 hours.
  3. 3. The method according to claim 1, wherein in step S2, The molar ratio of the noble metal element in the noble metal precursor to the transition metal element in the transition metal precursor is (0.04-2.0): 1-20; the noble metal element in the noble metal precursor comprises Pt; the transition metal element in the transition metal precursor comprises Fe.
  4. 4. The method according to claim 1, wherein in step S2, The noble metal precursor comprises a platinum precursor, and the platinum precursor comprises at least one of tetramine platinum nitrate and chloroplatinic acid; The transition metal precursor includes an iron precursor including ferrous chloride tetrahydrate.
  5. 5. The method according to claim 1, wherein in the step S3, the exchanging includes sealing stirring at 20-80 ℃ for 12-24 hours, and the stirring speed is 15-25 r/S.
  6. 6. The method according to claim 1, wherein in the step S3, the drying is performed at 85-120 ℃ for 10-48 hours.
  7. 7. The preparation method according to claim 1, wherein in the step S3, the roasting condition is that the roasting is performed in an air atmosphere at 200-800 ℃ for 3-24 hours.
  8. 8. The preparation method according to claim 1, wherein in the step S3, the total loading of the noble metal and the transition metal in the catalyst removed CVOCs is 1-20 wt%.
  9. 9. A catalyst for sulfur-resistant water-resistant efficient removal CVOCs prepared by the preparation method of any one of claims 1 to 8.
  10. 10. The application of a catalyst for high-efficiency sulfur and water removal CVOCs in CVOCs removal, which is characterized in that the catalyst is a catalyst for high-efficiency sulfur and water removal CVOCs in claim 9 and/or a catalyst for high-efficiency sulfur and water removal CVOCs prepared by the preparation method in any one of claims 1-8.

Description

Sulfur-resistant water-resistant catalyst for efficient removal CVOCs and preparation method and application thereof Technical Field The invention relates to the field of air pollution purification, in particular to a catalyst for sulfur-resistant water-resistant efficient removal CVOCs, a preparation method and application thereof. Background The chlorine-Containing Volatile Organic Compounds (CVOCs) are a class of organic pollutants that contain chlorine and have high volatility and toxicity. CVOCs is widely applied to various products such as cleaning agents, degreasing agents, chemical extractants, coating additives, printing inks, adhesives and the like in modern industrial production and daily life, and has important use value. Most CVOCs has high volatility and difficult degradation in natural environment, so that the natural environment-friendly flame retardant can be transported from an emission source through the atmosphere or spread in water, and causes long-time and wide-range environmental hazard, particularly the hazard of chlorobenzene is most prominent. Therefore, the low-temperature efficient CVOCs tail end treatment technology is a key means for realizing CVOCs great emission reduction and ensuring ecological environment safety. Among the existing CVOCs terminal treatment technologies, the catalytic removal technology is one of the mainstream technologies due to the wide application range. The performance of the catalyst is a core factor for determining whether the technology can operate efficiently and stably. Currently, catalysts applied to CVOCs catalytic removal can be mainly classified into three main categories, namely (1) noble metal catalysts which have good low-temperature activity but are too high in cost, (2) transition metal oxide catalysts which are low in price but extremely easy to poison and deactivate, and (3) molecular sieve catalysts which have good adsorption performance but extremely easy to cause carbon deposition and chlorine poisoning. Therefore, the aim of providing a CVOCs catalyst for removing chlorine poisoning with high efficiency and high selectivity at low temperature is to solve the problem in the art. Disclosure of Invention In order to solve the problems, the invention provides a catalyst for sulfur-resistant and water-resistant efficient removal CVOCs, and a preparation method and application thereof. The catalyst prepared by the invention can realize CVOCs removal at a lower temperature, and has higher CO 2 selectivity and hydrogen chloride selectivity. The technical scheme of the invention is as follows: the invention provides a preparation method of a catalyst for sulfur-resistant water-resistant efficient removal CVOCs, which comprises the following steps: s1, roasting a molecular sieve at a high temperature, and cooling; s2, respectively weighing a noble metal precursor and a transition metal precursor according to a proportion to prepare a mixed aqueous solution; S3, mixing and exchanging the molecular sieve treated in the step S1 with the mixed aqueous solution, washing and filtering, drying and roasting the solid to obtain the catalyst with sulfur resistance and water resistance and high-efficiency removal CVOCs. Preferably, in step S1, the process is performed, The silicon-aluminum ratio of the molecular sieve is 1-100; The molecular sieve comprises at least one of H-beta and H-ZSM-5; the high-temperature roasting temperature is 300-400 ℃ and the time is 2-3 hours. Preferably, in step S2, the step of generating a signal, The molar ratio of the noble metal element in the noble metal precursor to the transition metal element in the transition metal precursor is (0.04-2.0): 1-20; the noble metal element in the noble metal precursor comprises Pt; the transition metal element in the transition metal precursor comprises Fe. Preferably, in step S2, the step of generating a signal, The noble metal precursor comprises a platinum precursor, and the platinum precursor comprises at least one of tetramine platinum nitrate and chloroplatinic acid; The transition metal precursor includes an iron precursor including ferrous chloride tetrahydrate. Preferably, in the step S3, the exchange comprises sealed stirring at 20-80 ℃ for 12-24 hours, and the stirring speed is 15-25 r/S. Preferably, in the step S3, the drying condition is that the drying is carried out for 10-48 hours at 85-120 ℃. Preferably, in the step S3, the roasting condition is that the roasting is carried out for 3-24 hours in an air atmosphere at 200-800 ℃. Preferably, in step S3, the total loading of the noble metal and the transition metal in the catalyst removed CVOCs is 1-20 wt.%. The second aspect of the invention protects a catalyst for high-efficiency removal CVOCs of sulfur and water resistance, which is prepared by the preparation method of the first aspect. The third aspect of the invention protects the application of the catalyst for the high-efficiency sulfur-resistant and water-resistan