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Preparation method and application of small-pore molecular sieve-loading noble metal material prepared by one-pot reaction

A molecular sieve and noble metal technology, applied in the field of thermal catalysis, can solve the problems of requiring more equipment, not conducive to industrial application, and cumbersome synthesis steps, and achieve the effect of reducing synthesis steps, more NOx adsorption sites, and improving adsorption performance

Inactive Publication Date: 2020-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material preparation route is cumbersome and requires a lot of equipment, which is not conducive to industrial application.

Method used

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  • Preparation method and application of small-pore molecular sieve-loading noble metal material prepared by one-pot reaction
  • Preparation method and application of small-pore molecular sieve-loading noble metal material prepared by one-pot reaction
  • Preparation method and application of small-pore molecular sieve-loading noble metal material prepared by one-pot reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Noble metal-based small-pore molecular sieve material Pd-SSZ-13 (pure organic template method)

[0030] Dissolve 0.7 mL of 0.038 mol / L palladium nitrate dihydrate solution in 28 g of deionized water, then add 30 g of N,N,N-trimethyl-1-adamantyl ammonium hydroxide solution, and stir at room temperature for 15 min . Then weigh 0.3 g of aluminum hydroxide powder into the above solution and stir for 30 min. Finally, 11 g of silica sol (40 wt%) was weighed into the above solution and stirred at room temperature for 2 h to form a homogeneous solution.

[0031] The mixture was transferred to a 100 mL reactor and subjected to static crystallization in an oven at 160 °C for 6 days. After the crystallization reaction, the product was washed several times with deionized water until the pH of the supernatant was neutral, the product was collected by filtration, and then dried in an oven at 100 °C for 24 h. The dried product was further placed in a tube furnace, and ca...

Embodiment 2

[0032] Example 2: Noble metal-based small-pore molecular sieve Pd-SSZ-13 (mixing method of alkali solution and organic template)

[0033] Measure 0.7 mL 0.038 mol / L palladium nitrate dihydrate solution, weigh 15 g N,N,N-trimethyl-1-adamantyl ammonium hydroxide solution and 4 g 5 mol / L sodium hydroxide solution , followed by adding 36 g of deionized water, stirring and mixing at room temperature for 15 min. Then, 0.3 g of aluminum hydroxide powder was weighed and added to the above solution and stirred for 30 min. Finally, 11 g of silica sol (40 wt%) was weighed into the above solution and stirred for 2 h to obtain a homogeneous solution.

[0034] The mixture was transferred to a 100 mL reactor and subjected to static crystallization in an oven at 160 °C for 6 days. After the crystallization reaction, the product was washed several times with deionized water until the pH of the supernatant was neutral, the product was collected by filtration, and then dried in an oven at 100 °C...

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Abstract

The invention relates to the technical field of thermocatalysis, in particular to a preparation method and application of a small-pore molecular sieve-loading noble metal material prepared by one-potreaction. The small-pore molecular sieve-loading noble metal material provided by the invention comprises a small-pore molecular sieve SSZ-13 and a noble metal Pd species dispersed in the small-pore molecular sieve. The one-pot reaction for preparing the small-pore molecular sieve-loading noble metal material can effectively reduce the synthesis steps and shorten the preparation time of a catalytic material. The method can uniformly disperse noble metal in the molecular sieve, prevent agglomeration of the noble metal species, and provide more NOx adsorption sites. The small-pore molecular sieve-loading noble metal material disclosed by the invention is applied to the field of low-temperature NOx adsorption and high-temperature NOx desorption, the adsorption efficiency of the small-pore molecular sieve-loading noble metal material prepared by the one-pot reaction on NOx under a low-temperature condition is remarkably improved, so that NOx removal at a low temperature can be effectivelyrealized, and the small-pore molecular sieve-loading noble metal material can be applied to the field of atmospheric pollution treatment.

Description

technical field [0001] The invention relates to the technical field of thermal catalysis, in particular to a small-pore molecular sieve loaded noble metal (Pd-SSZ-13) material prepared by a one-pot method and its application in low-temperature removal of nitrogen oxides in diesel vehicle exhaust. Background technique [0002] Currently, ozone is gradually replacing PM 2.5 Fine particle pollutants, represented by fine particles, have become the primary cause of air pollution in large and medium-sized cities in my country. Nitrogen oxides (NO x ) is an important precursor for the production of ozone. The transformation of transportation in large and medium-sized cities and the increase in the number of motor vehicles in the country have caused motor vehicles to emit NO x Become the main human activities to emit NO x one of the sources. Among them, diesel vehicles emit NO x NO emissions from motor vehicles x The proportion of the total amount is as high as 68%, so the co...

Claims

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Application Information

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IPC IPC(8): B01J29/74B01J37/00B01J37/30B01J37/08B01D53/94B01D53/56
CPCB01J29/74B01J37/0018B01J37/30B01J37/088B01D53/9413B01D2258/01B01J2229/186B01J35/399
Inventor 陈培榕熊梧琬付名利叶代启
Owner SOUTH CHINA UNIV OF TECH
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