BELCAT II Catalyst Analyzer
All-in-One, Fully-Automatic and Multi-Purpose Analyzer
The surface properties of solid catalyst is studied in various ways. The catalytic activity of solid acid catalyst is determined by its acidity / basicity. In the supported precious metal catalysts, the dispersion rate of the supported metal, metal surface area and particle size are strongly associated with cost and performance. Adsorption kinetics and the saturated adsorption amount are keys to develop new adsorbent material. The solid catalyst reaction generally happens on its surface and the specific surface area is an important factor. BELCAT II is a catalyst analyzer to perform these measurements in one. This can be applied to other various measurements and supports a wide range of customization. You can use it as a comprehensive catalyst analysis tool.
Features:
Optimized Gas Flow Path
The gas flow path volume has been minimized by an integrated manifold valve block. The gas flow volume is controlled by the high precision massflow controller to enable stable measurements.
High resolution TCD detector
Highly sensitive 4-element thermal conductivity detector (TCD) and improved circuit board makes smoother and highly sensitive spectrum can be measured.
Triple Sample Tube
The triple sample tube is adopted as proven in the thermal analysis. The gas preheated at the outer peripheral portion close to the electric furnace can be injected to the sample. For pulse chemisorption measurement, the sample can be exchanged by simply removing the outer tube. The handling is greatly improved.
Compact Design
Attractively designed compact cabinet having a small footprint with various features
Unique Gas Flow Design and Gas Mixing Function
BELCAT II is equipped with 8 gas ports.All the gases can be used for pre-treatment / pulse gas. Without changing the gas connection, the gas ports can support various measurements. Additionally, they can be used for the standard gas mixing function.It is useful for measurement such as temperature-programed reduction (TPR), or temperature programmed oxidation (TPO). Without the use of conventional pre-mixed gas cylinders,measurements are available by preparing pure gas cylinders.
Vapor Dosing (option)
Equipped with a condenser, vapor dosing with the accurate concentration is available. The vapor adsorption amount can be measured by using pulse chemisorption measurement,and catalytic reaction in a humidified gas can be evaluated. Not only continuous vapor flow, but also the adsorption amount measurement of vapor with various pulsated steam is supported and it can also be used in the catalytic reaction in a humidified atmosphere.
Safety Measures to Protect the Researchers
Electric furnace is fully covered and the door is locked when thefurnace is heated. In addition, all of the heating units are equipped with over heat protection function separately from the control circuit. Heating and gas are stopped together with an alarm when it exceeds the set value. The interlock is also equipped and connected to pressure, along with a flow rate alarm and gasdetector (optional), for use with confidence.
Applications
Temperature-Programmed Desorption Measurement (TPD)
Known as a method to examine the chemical adsorption characteristics on the solid surface and generally represented by the spectrum with desorbed gas concentration as the Y-coordinate and temperature as the
X-coordinate. By raising the sample temperature continuously and detecting the desorbed gas, desorption peak number (kind of adsorption points), desorption temperature (activation energy for desorption) and desorption amount (number of adsorption points) can be obtained.NH3-TPD as acid nature evaluation for solid acid catalyst and CO2-TPD as basic evaluation for solid base catalyst are widely utilized.
TPO/TP Reduction and TP Reaction Measurement
Known as a method to examine the reaction characteristics of solid surface and represented by the spectrum with consumption or production of reactant as Y-coordinate and temperature as X-coordinate. Temperature characteristics of catalytic reaction can be measured continuously and especially, each step of step-by-step
reaction can be individually observed. Utilized for TPR measurement, NOx reduction, CO oxidation reaction, organic heating reaction, etc. by measuring the reduction temperature of the sample under a hydrogen
atmosphere
Pulse Measurement
Pulse measurement is to calculate the adsorption amount from thedifference of the peak area between unsaturation and saturation by injecting a certain amount of gas to the sample continuously until saturation. Metallic dispersion can be calculated by the pulse measurement using such gas as CO, H2, etc. that selectively chemisorbon the metal surface. Other applications are reported on oxygen storage capacity (OSC) measurement using O2 pulse, metallicdispersion measurement for supported Cu catalyst using N2O, etc.
Adsorption Breakthrough Curve Measurement
The adsorption gas is introduced to the sample, and its concentration is sensed by the detector at the downstream of the sample. Initially, almost all the adsorption gas is adsorbed to the adsorbent and gas concentration detected at the downstream side is nearly zero. When the amount of adsorption to the sample gets close to saturation, the concentration ofthe gas leaking out to the downstream becomes high and it becomes the
same as the injected gas concentration when it reaches saturation. Evaluation of the adsorbent is available by measuring the behavior and adsorption amount until it reaches saturation
BET Specific Surface Area
This is surface area per unit weight of solid and in the case of solid catalyst, it largely influences catalytic activity as the contact area withthe reactant. Specific surface area is calculated with the BET principle by measuring the nitrogen desorption amount when the sample is cooled down to the liquid nitrogen temperature under the helium-diluted nitrogen gas flow and then returned to room temperature. Not only for solid catalyst, this is a measurement method dispensable for various powder sample evaluations such as adsorbent.
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BINARY-COMPONENT BREAKTHROUGH CURVE MEASUREMENT
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