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A method for evaluating the loss amount and loss rate of lost components in a gas-solid catalyst

A technology of loss rate and evaluation method, applied in measurement devices, analytical materials, instruments, etc., can solve problems such as DPF blockage and SCR poisoning

Active Publication Date: 2021-09-10
天津索克汽车试验有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Example 2: The technical route of National VI heavy-duty diesel vehicles is DOC (oxidation catalytic converter, Diesel oxidation catalyst) + DPF (diesel particulate filter, Diesel particulate filter) + SCR + ASC (ammonia slip catalyst, Ammonia slip catalyst) ), where the main function of DOC is to oxidize part of the NO in the exhaust of diesel vehicles into NO 2 , its active components are precious metal elements Pt and Pd, and there is also loss caused by coating peeling off during use. The lost Pt and Pd will lead to blockage of DPF and even poisoning of SCR

Method used

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  • A method for evaluating the loss amount and loss rate of lost components in a gas-solid catalyst
  • A method for evaluating the loss amount and loss rate of lost components in a gas-solid catalyst
  • A method for evaluating the loss amount and loss rate of lost components in a gas-solid catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0067] Embodiment 1: Measuring the volatilization amount and volatilization rate of element vanadium in a vanadium-based SCR sample, comprising the following steps,

[0068] (1) SCR carrier measurement: remove the metal shell and cushion of the SCR sample to obtain the SCR carrier, blow and clean the surface of the SCR carrier with compressed air, weigh it with an electronic balance, and the result is accurate to 0.1g, and measure the SCR carrier with a vernier caliper The diameter and height, the result is accurate to 0.1mm, calculate its volume.

[0069] (2) SCR carrier sampling: see the sampling diagram figure 1 , cut the SCR carrier from the vertical 1 / 2 and the horizontal 1 / 2 respectively to obtain four parts: the upper left part, the upper right part, the lower left part and the lower right part, and any part of it is taken. The sampling part 1 is to sample from the center of the carrier. The sampling specification is Φ20mm×25mm. After purging and cleaning the surface o...

Embodiment 2

[0109] Example 2: Measuring a coating coated with V 2 o 5 The volatilization amount and volatilization rate of element vanadium in the DPF sample

[0110] Change the measurement sample to one coated with V 2 o 5 DPF sample, others are the same as embodiment 1.

Embodiment 3

[0111] Example 3: Measuring the volatilization amount and volatilization rate of elemental tungsten in the vanadium-based SCR sample

[0112] The measured volatile element was replaced by tungsten, the mass number of the selected isotope was 182W, the internal standard element used was replaced by 185Re, and the others were the same as in Example 1.

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Abstract

The invention discloses a method for evaluating the loss amount and loss rate of lost components in a gas-solid phase catalyst, comprising the following steps: (1) measuring the volume of a complete sample; (2) taking a small sample of the complete sample; (3) taking a small sample and (4) Small sample hydrothermal aging; (5) Program blank test; (6) Sample preparation and weighing of capture medium: (7) Digestion of capture medium; (8) Test solution of capture medium Analysis; (9) Calculation of results. This method can be used for the investigation of the volatilization characteristics of various gas-solid phase catalysts, such as volatilization amount, volatilization rate, and volatilization influence conditions, as well as for the investigation of the shedding amount, shedding rate and shedding influence conditions of catalyst particles. The inspection of the lost components of solid-phase catalysts is especially suitable for the inspection of the lost components of monolithic gas-solid phase catalysts for motor vehicles.

Description

technical field [0001] The invention belongs to the technical field of analysis, testing and evaluation of gas-solid catalysts, and in particular relates to a method for evaluating the loss amount and loss rate of lost components in gas-solid catalysts. Background technique [0002] As our country's environmental protection work is increasingly strengthened, it is becoming more and more important to reduce the emission of motor vehicles, and the emission standards are also continuously upgraded. The secondary unconventional pollutants produced by the loss of catalyst element components in the exhaust after-treatment devices of motor vehicles have been given great attention. [0003] Example 1: Selective catalytic reduction device (SCR), the necessary equipment for eliminating NOx components in diesel vehicle exhaust, has two main technical routes: one is vanadium-based metal oxide type SCR (referred to as vanadium Base SCR, Vanadium-basedSCR, abbreviated as V-SCR), and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 刘悦冯曦李军
Owner 天津索克汽车试验有限公司
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