Description
Automated Catalyst Characterization System - A
catalyst characterization laboratory enclosed in one cabinet.
The AutoChem II 2920 is a fully automated chemisorption analyzer that can
provide your laboratory with the ability to conduct a comprehensive array of
highly precise studies of chemical adsorption and temperature-programmed
reactions. With this single instrument, you can acquire valuable information
about the physical properties of your catalyst, catalyst support, or other
materials. It can determine catalytic properties such as percent of metal
dispersion, active metal surface area, acid strength, surface acidity,
distribution and strength of active sites, BET surface area, and more. The
AutoChem II 2920 performs pulse chemisorption, temperature-programmed reduction
(TPR), desorption (TPD), oxidation (TPO), and reaction analyses and does it
automatically.
Features
- Powerful Windows operating and data reduction software
- Three gas ports (prep, carrier, and analysis) contain four inlets
providing the capability to perform four-gas sequential experiments
- Four high-precision, independently calibrated mass flow controllers
provide extremely accurate, programmable gas control
- With the CryoCooler option, analysis temperatures can be ramped over the
range of -70 °C to 1100 °C
- Graphic reports for BET surface area, pulse chemisorption, heat of
adsorption, and more. In addition, it has an integrated Grams/32® peak
editor package which provides peak selection and editing, integration, data
smoothing, rescaling, and overlay capability.
Analysis Technique
The AutoChem II 2920 utilizes the dynamic (flowing
gas) technique to perform chemical adsorption analyses of active sites on
the surface of the sample material. The analysis methods include
temperature-programmed reactions (desorption, reduction, and oxidation) and
pulse chemisorption. The instrument also may be used to perform single-point BET
surface area analyses by physical adsorption. The flowing gas technique is used
in two different modes. In one, an active gas (pure or mixed with a carrier) is
flowed through the sample bed to pretreat quickly the sample for subsequent
analyses. Another mode utilizes the titration technique in which small,
reproducible volumes of a reactive gas such as hydrogen, oxygen, carbon
monoxide, sulfur dioxide, or ammonia are injected into an inert carrier gas
stream that passes through the sample bed. Vapors such as pyridine or isopropyl
amine can be introduced into the carrier stream by the vapor generator, which
allows for the precise volume dosing of a vapor as an analysis gas. In either
mode, matched thermal conductivity detectors compare the sample stream to a
reference stream of pure carrier gas to quantify changes in gas composition
resulting from reactions in the sample cell.
The AutoChem II 2920 is a high-resolution (up to 10 data points per second),
fully automated instrument that can be programmed to perform a user-defined
sequence of pretreatment and analytical tasks. Temperature can be controlled
from subambient (-70 °C) to 1100 °C with programmable heating ramps and
plateaus. Independently heated compartments maintain valves and gas lines at
controlled temperatures so vapors can flow through the system without
condensation. Special external ports also allow products from the reaction
chamber to be directed to a mass spectrometer or other external detector.
Analyses performed by the AutoChem II 2920 are TPD, TPR, TPO, Pulse
Chemisorption, and BET Surface Area.
Specification
| Electrical: |
Voltage: 85 to 265 VAC
Frequency: 50/60 Hz
Power: 1100 VA, operating, max. |
| Control
Module: |
Minimum Requirements
Processor: Pentium 333 MHz or equivalent
Operating System: Windows 2000 or XP Professional
Memory: 128 megabyte of random-access memory RAM
Hard Disk Space: 1-gigabyte hard drive
Graphics Card: 800 x 600 super VGA
One CD ROM drive |
| Options: |
Vapor Generator
CryoCooler |
| Temperature
system: |
Range: -70 to 1100 °C with
Cryo-Cooler option
Ambient to 1100°C (without CryoCooler)
Selection: Digitally set, 1 °C increments
Ramp Rates:
Up to 50°C per minute from 120 to 500 °C range
Up to 30 °C per minute from 500 to 750 °C range
Up to 10°C per minute from 750 to 1100 °C range
|
| Gases: |
Loop (Analysis): H2, CO, O2,
N2O, NH3 vapors such as pyridine, water, etc.
Carrier: He, Ar, and other gases
Preparation: H2, O2, He, Ar, and others |
| Gas Flow
Rate: |
All Mass Flow Controllers (MFCs)
Manual Control: 0 to 100 mL/minute*
Automatic Analysis: 10 to 75 mL/minute
*Rate for Hydrogen; other gases have a different range.
|
| Gas
Delivery: |
Inlet Ports: (12) 4 each for
preparation gas, carrier gas and loop (analysis) gas
Temp. Control: Internal gas lines and valves heated up to 150 °C |
| Sample Tube: |
Type: Fused quartz Flow-Thru
sample tubes, for use up to 1100 °C, accepts powders and pellets up to 9
mm in diameter |
| Physical: |
Height: 62 cm (24.5 in.)
Width: 66 cm (26.0 in.)
Depth: 58 cm (22.75 in.)
Weight: 60 Kg (130 lbs.) |
| Environment: |
Temperature: 15°C to 35°C
operating
0°C to 50°C nonoperating
Humidity: 20 to 80% relative,non-condensing |
|
