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Natural gas vehicle tai-gas clean-up catalyst and preparation method thereof

An exhaust gas purification and natural gas technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problem of unsuitable natural gas vehicle exhaust, and achieve the effect of increasing methane purification performance and high stability

Inactive Publication Date: 2009-10-07
昆明贵研催化剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts for gasoline and diesel vehicles are not suitable for the purification of exhaust gas from natural gas vehicles

Method used

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  • Natural gas vehicle tai-gas clean-up catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 110g of cerium-zirconium solid solution, add 132mL of deionized water, add 12.5mL of rhodium nitrate (8.0g / L) while stirring, and dry at 100°C for 12 hours; the best calcination condition is to calcine at 500°C for 2 hours. Grind the calcined material with 10 g of pseudo-boehmite, then add 156 mL of deionized water and stir, adjust the pH to 4-5 with nitric acid to prepare a coating slurry, and impregnate 1.0 L of ceramic carrier in a vacuum container slurry. After that, it was dried at 120°C for 5 hours for later use.

[0031] Weigh 6.3g of cerium nitrate and 6.6g of lanthanum nitrate, dissolve them in ionized water, add 50g of HZSM-5, stir at room temperature for 24h, dry at 100°C for 12h, and calcinate at 500°C for 4h to obtain modified HZSM-5. Add 55mL deionized water to the modified HZSM-5, add 11.3mL palladium nitrate (80.0g / L) and 6.3mL chloroplatinic acid (80.0g / L) while stirring, and dry at 100°C for 12 hours; calcined for 2 hours. Grind the calcined m...

Embodiment 2

[0033]The reagents used for the modified molecular sieve are cerium nitrate and ferric nitrate, and the rest of the preparation method is the same as in Example 1. It is counted as catalyst 2#.

Embodiment 3

[0035] The reagents used for the modified molecular sieve are cerium nitrate and lanthanum nitrate, and the rest of the preparation method is the same as in Example 1. It is counted as catalyst 3#.

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Abstract

The invention relates to a high-performance natural gas vehicle tail-gas clean-up catalyst and preparation method thereof, wherein the catalyst has higher catalytic conversion performance to CO, HC, NOx, especially capable of effectively conversing methane at low temperature. The catalyst comprises a first carrier, a second carrier on the first carrier and active components, characterized in that: the second carrier comprises a molecular sieve modified by the metal oxides and cerium zirconium solid solution; the active components comprise two or three kinds of noble metal platinum, palladium and rhodium. The first carrier is cordierite ceramic honeycomb carrier and the second carrier loads and the cerium, zirconium solid solution loaded with one or more than one noble metal selected from the platinum, palladium and rhodium is used as the first layer load on the cordierite ceramic honeycomb carrier and the molecular sieve modified by the metal oxide and loaded with one or more than one noble metal selected from the platinum, palladium and rhodium is used as the second layer load on the first load.

Description

technical field [0001] The invention relates to a high-performance natural gas vehicle tail gas purification catalyst and a preparation method thereof. The catalyst has high catalytic conversion performance for CO, HC and NOx, and can particularly effectively convert methane at low temperature. Background technique [0002] With the increasingly stringent regulations on vehicle exhaust emissions and the depletion of oil resources, ordinary gasoline engines and diesel engines need to invest a lot of money to meet strict emission regulations, coupled with the rise in oil prices, so it is necessary to find clean alternative energy sources. For this reason, countries all over the world have increased the research and development of alternative fuel vehicles, and natural gas vehicles have become the fastest-growing alternative fuel vehicles in recent years due to a series of advantages. [0003] The pollutant emissions of natural gas vehicles are lower than those of gasoline vehi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/068B01J29/072B01J35/04B01J29/44B01J29/46B01J37/025B01D53/94B01D53/72B01D53/62B01D53/56
CPCY02C20/10Y02A50/20
Inventor 卢军赵云昆吴乐刚李文松张爱敏
Owner 昆明贵研催化剂有限责任公司
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