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Integral Pd-Pt catalyst for purifying industrial organic waste gas and preparation method thereof

A technology for organic waste gas and catalyst, which is applied in the field of monolithic Pd-Pt catalyst and its preparation, can solve the problems of uncertain content of cerium-zirconium oxide and the like

Active Publication Date: 2014-06-04
金华铂锐催化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of loading cerium-zirconium oxide is to heat and impregnate the nitrate solution of cerium and zirconium, and the adsorbed nitrate is precipitated and washed, thus resulting in the uncertainty of the content of cerium-zirconium oxide and the generation of nitrate-containing wastewater

Method used

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  • Integral Pd-Pt catalyst for purifying industrial organic waste gas and preparation method thereof
  • Integral Pd-Pt catalyst for purifying industrial organic waste gas and preparation method thereof
  • Integral Pd-Pt catalyst for purifying industrial organic waste gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) The first coating: weigh 21g of cerium-rich mixed rare earth oxide (containing cerium oxide: 90wt%, lanthanum oxide: 6.5wt%, praseodymium oxide + neodymium oxide: wt3.5%), pseudoboehmite viscose Mixture 350g (containing 105g of alumina), 70g of acidic silica sol (containing 14g of silica), that is, the mass ratio of cerium-rich mixed rare earth oxide: alumina: silica is 15:75:10. Add another 500ml of deionized water to dilute, ball mill for 4 hours, and adjust the acidity to pH=3.5 with concentrated nitric acid. The cordierite honeycomb ceramic carrier (200 mesh / in 2 , appearance 100mm*100mm*40mm) impregnate the above slurry, and blow out the excess slurry in the pores of the honeycomb ceramic carrier with high-pressure gas. It was then dried at 110°C and calcined at 500°C for 4 hours. The coating amount of the first coat was 35 g / L.

[0016] (2) The second coating: Weigh 1.6g KOH and add 2L of deionized water to prepare an aqueous solution, impregnate the cordie...

Embodiment 2

[0022] The first coating and the second coating of the catalyst are the same as in Example 1, except that the mass ratio of the third coating Pd and Pt is 1:1, that is, the H containing Pd4.8g is weighed. 2 PdCl 4 solution and Pt4.8g of H 2 PtCl 6 solution, add deionized water to make a 60L solution, and adjust the acidity to pH=4.5 with concentrated nitric acid. The 32L cordierite honeycomb ceramic carrier coated with the above two coatings was impregnated in it to make H 2 PdCl 4 and H 2 PtCl 6 Adsorbed on the surface of the carrier, the cordierite honeycomb ceramics containing noble metals Pd and Pt are separated from the aqueous solution, dried at 110°C, and calcined at 500°C for 4 hours to obtain the Pd-Pt catalyst of the present invention. The total amount of noble metals Pd and Pt of the third coating is 0.3 g / L. The catalyst activity evaluation results are shown in Table 2. Catalyst evaluation conditions were the same as in Example 1.

[0023] Table 2: Perform...

Embodiment 3

[0026] The first coating and the second coating of the catalyst are the same as in Example 1, except that the mass ratio of the third coating Pd and Pt is 1:4, that is, the H containing Pd1.92g is weighed. 2 PdCl 4 solution and Pt7.68g of H 2 PtCl 6 solution, add deionized water to make a 60L solution, and adjust the acidity to pH=4.5 with concentrated nitric acid. The 32L cordierite honeycomb ceramic carrier coated with the above two coatings was impregnated in it to make H 2 PdCl 4 and H 2 PtCl 6 Adsorbed on the surface of the carrier, the cordierite honeycomb ceramics containing noble metals Pd and Pt are separated from the aqueous solution, dried at 110°C, and calcined at 500°C for 4 hours to obtain the Pd-Pt catalyst of the present invention. The total amount of noble metals Pd and Pt of the third coating is 0.3 g / L. The catalyst activity evaluation results are shown in Table 3. Catalyst evaluation conditions were the same as in Example 1.

[0027] Table 3: Perfo...

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Abstract

The invention discloses an integral Pd-Pt catalyst for purifying industrial organic waste gas and a preparation method thereof. The catalyst comprises a cerium-enriched mixed rare earth oxide, Al2O3, SiO2, K, precious metals Pd and Pt and a cordierite honeycomb ceramic carrier, wherein the cerium-enriched mixed rare earth oxide, a pseudo-boehmite binding agent and an acidic silicon sol are coated on the surface of the cordierite honeycomb ceramic carrier, KOH is further loaded, and the precious metals Pd and Pt are loaded through an impregnation method so as to prepare the catalyst; the total coating mass of the cerium-enriched mixed rare earth oxide, the pseudo-boehmite binding agent and the acidic silicon sol is 35g per liter of the catalyst, the K capacity is 0.1g per liter of the catalyst, the capacity of the Pd and Pt is that each catalyst contains 0.3g of the Pd, and the mass ratio of Pd to Pt is 1 to (0.25-4). The catalyst provided by the invention has the advantages that carbon accumulation on the surface of the catalyst can be prevented, the heat stability is good, the bonding strength of a catalyst coating is high, and the activity is good.

Description

technical field [0001] The invention relates to a chemical catalyst, in particular to an integral Pd-Pt catalyst for purifying industrial organic waste gas and a preparation method thereof. Background technique [0002] Toluene, xylene, styrene, ethyl acetate, acetone and other volatile organic compounds (VOCs for short) are released in the production process of paint, metal product coating, printing, pharmaceutical, leather, textile printing and dyeing, enameled wire and other industries. Volatile organic compounds are one of the main harmful substances that cause air pollution, and are also the main source of photochemical pollution and the formation of fine particulate matter (PM2.5), which has seriously affected people's lives. [0003] Catalytic combustion is one of the most effective methods for purifying volatile organic waste gas. It means that under the action of a catalyst, organic waste gas can undergo oxidation reaction at a lower temperature to generate carbon d...

Claims

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Application Information

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IPC IPC(8): B01J23/63
Inventor 金凌云
Owner 金华铂锐催化科技有限公司
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