Product Overview

AMI-300IR represents the development direction and future of catalyst characterization instruments. After launching the world's first fully automatic chemical adsorption analyzer in 1984, AMI Instrument Company in the United States also launched the world's * * fully automatic in-situ infrared catalyst characterization system in 2015. Chemical adsorption and temperature programmed desorption (TPD) have been widely used for the characterization of catalysts. Generally, thermal conductivity detectors (TCD) or mass spectrometers are used to detect gases escaping from the catalyst surface. By using these techniques, the number and strength of active sites can be understood, but the properties of catalytic sites, types of adsorption, or the presence of multiple types of catalytic sites have not yet been analyzed. To fill this gap, AMI Instrument Company has developed the AMI-300IR, which combines AMI's original standard technology with Fourier transform infrared spectroscopy (FTIR) for in-situ analysis of catalyst surfaces. This combination technology enables direct observation of adsorbed substances, thereby expanding our understanding of the properties of adsorption/desorption processes.

The AMI-300 IR model is a fully automated chemical adsorption analysis instrument of the XIN generation

• In situ infrared characterization

• Cheng dynamic chemical adsorption function

• Temperature programmed desorption (TPD)

• Programmed temperature reduction/oxidation (TPR/O)

• Temperature programmed response (TPRx)

• Pulse chemical adsorption

• Steam adsorption

• Dynamic BET specific surface area

• Pulse calibration

• Catalyst treatment

• As needed, the standard TCD detector can be used for gas analysis, or

• Connect mass spectrometer or other detectors (FID, FTIR, GC, etc.)

Product Features

Infrared reaction pool

Multiple heatable infrared detection reaction tanks are used in conjunction with the host to achieve infrared reaction analysis.

7 standard functions

Pulse chemical adsorption, TPR / TPO，TPD，TPRx， Steam adsorption, pulse calibration, and dynamic BET. Can program 99 processes into one experiment.

10 air intakes

There are 4 channels for processing gas and carrier gas, and the remaining 2 ports can be used for mixed gas or auxiliary gas. Additional ports can be added.

Quantitative ring

There are 13 models to choose from, providing a convenient way to meet different quantity requirements.

High temperature furnace

The temperature range is -130 ℃ to 1200 ℃, and it can be heated linearly at a rate of 1-50 ℃/min.

Real time measurement of sample temperature

A movable temperature measuring thermocouple is placed at the top of the sample bed layer

3 independent MFCs

In addition to controlling the carrier gas and process gas, there is also an MFC that independently controls the auxiliary gas (which can be mixed with the carrier gas or process gas).

High precision Mass Flow Controller (MFC)

The flow rate is 5-50ml/min (under standard conditions). Other ranges can be selected according to requirements.

Liquid evaporator

Equipped with a heatable spray type saturator, it can easily introduce volatile liquids.

Air cooling components

Automatic control, quickly cooling the furnace through air blowing to shorten the experimental time.

Multiple types of sample tubes

Quartz U-shaped tubes that can accommodate samples of various sizes to accommodate the volume and size of different catalyst samples. The sample form can be powder, particle, strip or honeycomb.

Gas mixing ability

AMI-300 has gas mixing function and can replace expensive gas mixers, such as conducting TPR or TPO experiments that require multi-component gases.

Product Features

Mixing function

The AMI-300 IR has gas mixing function and can replace expensive mixed gases, such as multi-component gas mixing required for TPR or TPO experiments.

The sample is easy to load

Mobile shell furnace makes it easy to remove and load sample tubes.

Reference station

Ensure that the gas does not come into contact with the sample during the calibration pulse process to improve accuracy.

Cold trap

A cold trap filled with desiccant can be installed downstream of the sample tube to remove condensates before flowing through TCD.

Quantitative injection port

Provides a quantitative needle injection port for precise calibration of the quantitative ring volume.

Overall pipeline insulation

All valves and pipelines are placed in a heatable and insulated box to prevent condensation.

External mass spectrometer

Real time integration of MS data and AMI-300 data is achieved through Direct Data Exchange (DDE).

The system has a small dead volume

Use low volume valves and 1/16 pipelines to reduce dead volume and minimize peak diffusion to a certain extent.

Introduction to AMI-300IR Infrared Cell

Use low volume valves and 1/16 pipelines to reduce dead volume and minimize peak diffusion to a certain extent.

Figure 3. Infrared transmission cell pool

(In order to clearly display the infrared transmission component, the heating and insulation components were removed)

The AMI-300IR model can use all the standard procedure steps of the AMI-300 to analyze samples, and detect sample surfaces and adsorbates through an infrared spectrometer. At the same time, the instrument can use the standard TCD detector or optional mass spectrometer to detect the effluent gas. The AMI-300IR model can adapt to most commercial FTIR instruments in the market. If you wish to use other FTIR instruments, you need to provide the type and model of FTIR. We can evaluate the feasibility of designing and adjusting AMI configurations to provide you with a complete integrated solution.

TCD detector

A high-precision 4-fire TCD detector with high linearity, accuracy, sensitivity, and stability. There are different filament materials to choose from.

Auxiliary detector

Can accept any auxiliary detector that provides analog voltage output, such as flame ionization detector (FID).

Structural material

The seals and materials are custom designed according to your needs.

safeguard

Independent furnace over temperature protector, gas safety valve, check valve, circuit breaker, and TCD anti dry burning system.

Software

software control

The AMI-30IR is a fully automatic instrument controlled by a computer, with reliable data and easy operation. It is not necessary to have an operator on duty all the time during the experiment. Can be installed on Windows based computers, can be connected to the internet, and in addition to controlling instruments, the computer can also manage other laboratory tasks.
The "Overview" interface displays the device status at a glance, providing information such as the position of all valves, gas type, temperature, and detector signals for each port. The change in line color can indicate the current flow path

The powerful software control function of AMI series

Experimental program setting interface

Users can flexibly select or edit TPD, TPO ,TPR , TPRS, Pulse chemical adsorption, quantitative ring calibration experiments, etc. can be set up with up to 99 programs to achieve full automation of adsorption, desorption, and chemical reactions. The complete experimental setup can be completed within a few minutes and saved for future use or modification.

Instrument safety protection program setting interface

The software has an alarm program that can implement various security protection mechanism settings. In manual mode, simply click the mouse on the icon to switch any valve. You can input gas flow rate and set temperature values from the page.

Interface for collecting mass spectrometry data

Can be connected to mass spectrometry (MS) or gas detectors, supports multiple external detectors, provides series and parallel connection methods, can embed mass spectrometry (MS) data acquisition into AMI software, and achieve the same file export of TCD&MS; data

Powerful data analysis capabilities

The data processing software can complete the fitting, peak separation, integration, differentiation, and superposition processing of signal peaks, thereby obtaining the characteristic information of the sample, including the surface characteristics of the catalyst, the distribution of surface acidic/alkaline sites, activation energy, reaction kinetics data, etc.

Data analysis interface

Calculation of adsorption capacity

Peak integration interface

Automatic peak fitting interface

Typical applications

Adsorption of CO by Platinum Catalyst

The following is an example of the study on the adsorption and desorption model of CO on the surface of platinum catalyst using the infrared combined technology mentioned above. The 1% Pt/Al2O3 catalyst was pressed into circular flakes and installed on an IR unit. The sample was reduced at 200 ° C for several hours, cooled to room temperature, and then purged with inert gas for 1 hour to remove impurity gases and physically adsorbed CO. The resulting infrared spectrum (excluding background) shows that the peak at approximately 2060 cm-1 corresponds to linearly adsorbed CO, as shown in Figure 4.

Figure 4 Infrared spectrum of CO adsorption on 1% Pt/Al2O3 catalyst

Then heating the sample yields a function of CO as a function of temperature (Figure 5). According to Beer's law, absorbance is proportional to concentration, and from these measurements, isobars can be drawn, which can be used to obtain derived TPD data. These are shown in Figure 6 and Figure 7 respectively

Figure 5. Changes in CO signal at different temperatures

Figure 6. Isostatic lines of CO adsorption on 1% Pt/Al2O3

Figure 7. Derivative CO programmed temperature desorption

Infrared (IR) detection of pulse chemisorption

Figure 8. Infrared spectrum of pulse chemical adsorption of CO on platinum catalyst

Identification of BR Ø NSTED acid sites and LEWIS acid sites using ammonia chemistry method

Ammonia, as a probe molecule, can be used to determine the type and amount of acid sites in catalysts. As shown in Figure 9, it is an example of infrared detection of ammonia adsorption in silica alumina material. The three peaks at approximately 17601480 and 1380cm-1 are ammonia adsorption peaks. At 1480cm-1, it can be determined that there is ammonia adsorption at the B acidic site, while the rest is ammonia adsorption at the L acidic site (reference, M. Niwa et al., J. Phys. Chem. B, 110(2006) p. 264)。 By conducting temperature programmed experiments and plotting the absorbance as a function of temperature in the following three regions, the isobars of each type of adsorption can be measured, and the intensity of each specific adsorption can be detected. The isobaric line is shown in Figure 10

Figure 9. Infrared spectra of ammonia adsorption on silicon aluminum materials at three different temperatures

Figure 10. Isometric lines of ammonia adsorption at three different wavelength positions on silicon aluminum material

From these data, it can be seen that the adsorption at 1380cm-1 is possibly more firmly adsorbed than the other two, indicating that this is a binding of L acidic sites

performance parameter