JPH0933513A - Heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heater in which the pretreatment time for a material, e.g. a catalyst, reacting on a specific component in a sample gas and the time required for measurement can be shortened. SOLUTION: The heater 1 is employed for determining chemical species produced on the surface of a catalyst 3 by heating the catalyst 3 reacting on a specific component in sample gas S1 , S2 and for analyzing the sample gas reacted on the catalyst 3. A plurality of reaction chambers 4a, 4b, also serving as heating chambers, are disposed in a heating block 2 while housing the catalyst 3 and each reaction chamber/heating chamber is provided with a gas inlet 5 and a gas outlet 6 for communicating the sample gas S1 , S2 .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for subjecting a material such as a catalyst which reacts with a specific component in a sample gas to a pretreatment by heating.

[0002]

2. Description of the Related Art For example, the following method has been adopted to identify the chemical species produced as a result of adsorption of NO, NO ₂ , CO and other components in automobile exhaust gas on the surface of a catalyst.
One is to add catalyst powder to powder such as KBr that is transparent to infrared light.
A diffuse reflection method in which infrared light is irradiated onto the surface of a mixed powder that has been mixed and flattened at about 0 wt% and the chemical species are identified from the spectrum of the diffusely reflected light. Instead, for example, using a catalyst coated on the surface of a catalyst carrier made of beaded alumina having a size of 2 to 4 mm, or a catalyst coated inside the holes formed in the honeycomb-shaped catalyst carrier, A method of identifying a chemical species from the radiation spectrum of infrared light generated from these catalyst surfaces can be mentioned.

An example of a heating device using this method is shown in FIG. In FIG. 2, a heating tank 31 of the heating device is provided with a reaction tank / heating chamber 33 for heating a catalyst 32 that reacts with a specific component in the sample gas S. A gas inlet 34 and a gas outlet 35 are provided for circulating the gas. 36
Is an observation window through which the inside of the reaction chamber / heating chamber 33 can be observed, 37 is a heater for heating the inside of the reaction chamber / heating chamber 33, and 38 is a cup for housing the catalyst 32.

After the above-mentioned powdery, bead-shaped or honeycomb-shaped catalyst 32 is heated, a sample gas S is flown for measurement to identify the chemical species. In addition to this measurement, the pretreated catalyst 32
The analysis of the sample gas that has reacted with the gas is performed by an analyzer (not shown) arranged downstream of the gas outlet 35 as required.

[0005]

However, the heating block 31 for heating the powdery, bead-shaped or honeycomb-shaped catalyst 32 has only one heating chamber 33 for accommodating the catalyst 32. Therefore, in order to identify the chemical species and analyze the sample gas, it was necessary to repeat a series of processes of pretreatment, reaction and measurement of the catalyst 32 for each measurement.

Further, since the catalyst 32 must be pretreated for each measurement and the observation window 36 is removed to replace the catalyst 32, it takes a long time to replace the catalyst.

The present invention has been made in view of the above problems, and an object thereof is to provide a heating device capable of reducing the pretreatment time and the time required for measurement of a material such as a catalyst which reacts with a specific component in a sample gas. To do.

[0008]

In order to achieve the above object, the present invention heats a material such as a catalyst which reacts with a specific component in a sample gas to identify the chemical species formed on the surface of the material. In the heating device for analyzing the sample gas that has reacted with the material, a plurality of reaction tanks / heating chambers containing the material are provided in the heating block, and the sample gas is circulated in each reaction tank / heating chamber. A gas inlet and a gas outlet are provided for this purpose.

[0009]

[Function] Since a plurality of reaction tanks / heating chambers containing materials such as a catalyst that reacts with a specific component in the sample gas are provided in the heating block, the same number of materials as the reaction tanks / heating chambers are used as one material. The heating block can heat at the same time.

Therefore, it is no longer necessary to repeat a series of processes of pretreatment, reaction and measurement of the material such as the catalyst for each measurement as in the conventional case, and the material such as the catalyst and the like subjected to the pretreatment by heating at the same time. The time required for measurement can be shortened by using, while the reaction chamber and heating chamber can be observed through one observation window, and the catalyst and other materials can be exchanged by simply removing the observation window. The time required for can be reduced at the same time.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited thereby. FIG. 1 is an embodiment of the present invention, which is equipped with a microscopic optical system as a condensing optical system, and is configured to measure the radiation spectrum of a chemical species attached to or adsorbed on the surface of a catalyst to identify the chemical species. Indicates. In FIG. 1, reference numeral 1 is a heating device, and in a heating block 2 of the heating device 1, for example, a sample gas S ₁ containing CO gas, NO _x gas, and HC gas,
A plurality of reaction tank / heating chambers 4a, 4b for heating the catalyst 3 which reacts with the specific component in S ₂ are provided, and the reaction gas / heating chambers 4a, 4b are provided with sample gases S ₁ , S ₂ respectively.
A gas inlet 5 and a gas outlet 6 are provided for circulating the gas.

The heating block 2 is, for example, SU.
The catalyst 3 is made of S material, and the catalyst 3 is coated on, for example, bead-shaped alumina having a size of 2 to 4 mm. As the catalyst 3, for example, Pt, Rh, zeolite or the like is used. In addition, 7 is a reaction tank and heating chamber 4a, 4b
This is a single observation window that covers the inside and is made of a material such as barium fluoride that is transparent to infrared light. 8 is a rod-shaped or planar heater for simultaneously heating the reaction chamber / heating chambers 4a and 4b, 9 is a cup for housing the catalyst 3, and this cup 9 is a material having high temperature durability such as sapphire or platinum. Consists of. 10a and 10b are analyzers arranged downstream of the gas outlet 6.

Above the observation window 7, a microscopic optical system 11, a mask 12 and a spectroscope (or interferometer) 1 are arranged in this order from the bottom.
A condensing optical system A including 3 and a detector 14 that detects light from the spectroscope (or interferometer) 13 is arranged. The mask 12 is arranged so that only the radiation light from the surface of the catalyst 3 can be measured.

With the above structure, the reaction chamber / heating chambers 4a, 4a
For example, N ₂ gas is made to flow from the gas inlets 5 respectively provided in b, and the heater 8 is used to form the reaction chambers and heating chambers 4 a
The catalyst 3 is pretreated by heating the inside of b, and the gas sample gases S ₁ and S ₂ are respectively caused to flow from the gas inlet 5 to cause the chemical species to adhere and be adsorbed on the surface of the catalyst 3 and generated from the surface of the catalyst 3. The chemical species is identified by the radiation spectrum.

At this time, since a plurality of reaction tanks / heating chambers 4a, 4b are provided in one heating block 2, pretreatment of the catalysts 3 by the number of reaction tanks / heating chambers 4a, 4b is performed under the same conditions. (For example, about 800 ° C.) and simultaneously. Therefore, the pretreatment time of the catalyst 3 can be shortened. Further, although there are as many catalysts 3 as there are reaction chambers / heating chambers 4a, 4b, the replacement work can be performed by simply removing the observation window 7 covering both of the reaction chambers / heating chambers 4a, 4b. It is not necessary to repeat a series of processes of catalyst pretreatment, reaction, and measurement for each measurement, which is required in the past, and the time required for the measurement can be shortened.

In this measurement, the heating block 2
Is installed on a stage that can move in the three-dimensional X, Y, and Z directions, and the positions of the catalysts 3 in the reaction chamber / heating chambers 4a and 4b are stored in the computer in advance, the light is automatically collected. Each catalyst 3 can be moved to the position of the optical system A.

Further, according to the present invention, in addition to the measurement of chemical species, the sample gas S ₁ , which has reacted with the pretreated catalyst 3,
The analysis of S ₂ is performed by an analyzer 1 arranged downstream of the gas outlet 6.
Since it can be performed simultaneously with 0a and 10b, the time required for analyzing the sample gases S ₁ and S ₂ can be shortened as compared with the conventional case.

In addition to the catalyst, silica gel is used as a material which reacts with a specific component in the sample gas,
The heating apparatus of the present invention can also be applied to pretreating this and flowing a sample gas containing H ₂ O as a specific component into the heating chamber which also functions as a reaction tank to measure the absorption performance of silica gel.

Furthermore, in this embodiment, a bead-shaped catalyst is heated, but the present invention can be applied to the pretreatment of powdery or honeycomb-shaped catalyst.

[0020]

As described above, in the present invention, since a plurality of reaction tanks and heating chambers are provided in one heating block,
Pretreatment of the catalyst as many as the number of reaction chambers and heating chambers can be performed simultaneously under the same conditions. Therefore, the pretreatment time of the catalyst can be shortened. Also, even though there are as many catalysts as there are reaction chambers / heating chambers, replacement work can be performed simply by removing the observation window that covers multiple reaction chambers / heating chambers. It is not necessary to repeat a series of processes of catalyst pretreatment, reaction and measurement, and the time required for measurement can be shortened.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of the present invention.

FIG. 2 is a configuration explanatory view showing a conventional example.

[Explanation of symbols]

1 ... Heating device, 2 ... Heating block, 3 ... Catalyst, 4a, 4
b ... Reaction chamber / heating chamber, 5 ... Gas inlet, 6 ... Gas outlet, S
₁ , S ₂ ... sample gas.

Claims (1)

[Claims] 1. A heating device for heating a material such as a catalyst which reacts with a specific component in a sample gas to identify chemical species formed on the surface of the material and to analyze the sample gas reacted with the material. In the heating block, a plurality of reaction tanks / heating chambers containing the material are provided, and each of the reaction tanks / heating chambers is provided with a gas inlet and a gas outlet for circulating the sample gas. Heating device.