AutoChem II & HP

The Autochem II Series has been designed after years of experience by Micromeritics in the field of basic and advanced catalysts characterization for catalytic surface activity. Micromeritics is recognized in combining applied scientific innovation for many customers analytical requirements, even for the most demanding conditions.

Autochem II provides accurate and fast results applying chemisorption techniques in isothermal conditions on metal dispersion, exposed metal surface area and aggregate size, surface acid/basic sites quantification. When applying temperature programmed techniques like TPR, TPO, TPD and TPSR one can perform deep investigation on reduction / oxidation properties, determine the probe gas-solid activation energy or quantify the number and species of surface-active sites.

Complex characterizations are made easy by the Autochem II HP specifically designed to run experiments starting from atmospheric pressure up to 1000 psia (6.9 MPa), investigating the behavior of catalysts in conditions similar to real manufacturing plants. The standard detector is a high precision, high sensitivity, high linearity, and corrosion resistant TCD that can be integrated and coupled with an external detector like a mass spectrometer for selective gas monitoring. Signals are easily synchronized by the MicroActive control software. The Autochem II series can be equipped with a number of options to expand the analytical possibilities Cooling options include the Kwikcooler a Kwikcool Vortex device, and a CryoCooler II cryogenic option that expands the temperature range from –100 °C to 1100 °C. There are additional options including one of the most precise vapor generators available on the market.

 

Features and Benefits:

• Separate  circuits for sample preparation and analysis 

• Avoids the risk of tubing and detector contamination in case of release of corrosive gases during high temperature treatments 

• Independent mass flow controllers for the reference and analysis channels of TCD in the Autochem II 2920 

• This unique approach allows a completely automatic and precise quantitative calibration of the TCD signal for TPR,TPO and TPD experiments, covering in one run the complete range of reactive gas percentage in the inert carrier. Quick, fast, precise and easy. 

• Selectable temperatures of TCD and filaments  

•  Long lifetime of filaments because the TCD works at constant and selectable temperature avoiding the risk of burning. In addition, the TCD sensitivity can be improved when testing low metal percentages catalysts by increasing the temperature difference between the filaments and the monolithic block 

• Up to four temperature-controlled zones for the manifold and valves up to 150 °C 

• High versatility and safety in avoiding possible spot condensation in the analytical circuit that might jeopardize the accuracy of results 

• Up to nine temperature signals monitoring 

• Best control of the device monitoring the temperatures during operations 

• High precision vapor generator 

• Liquids can be kept at selectable temperatures between room temperature and 150 °C. The generated vapor partial pressure in the carrier is extremely constant thanks to a precise temperature control of the proprietary designed reflux condenser.  

• Low internal plumbing volume 
• Assures high resolution, fast detector response, and reduces error when calculating gas volumes.

Specifications

Electrical

Voltage	85 to 265 VAC
Frequency	50 or 60 Hz
Power	1100 VA, operating, max

 

Temperature System

Range	-100 °C to 1100 °C with Cryo-Cooler option Ambient to 1100 °C without Cryo-Cooler option
Selection	Digitally set, 1 °C increments
Ramp Rates	1Up 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

 

Specifications Flow control

All Flow controllers 100mL/min as the standard configuration

 

Gas Flow Rate

Vapor Generator, CryoCooler
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 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 in.)
Depth	58 cm (22.75 in.)
Weight	60 kg (130 lbs

 

Operating Environment

Temperature	15°C to 35°C operating, 0°C to 50°C non-operating
Humidity	20 to 80% relative,non-condensing

Innovative Design: AutoChem II 2920 Hardware Advantages

The AutoChem II features stainlesssteel construction, fully automated flow and pressure control, an embedded microprocessor with real-time control, and an intuitive graphical user interface for reactor control. A temperature controlled, stainless-steel flow path provides an inert and stable operating environment, and reduces the potential for condensation in the flow path.

• Twelve gas inlets (4 each for prep, carrier, and analysis) provide the capability to perform sequential experiments such as TPR/ TPO cycle experiments.
• Equipped with four high-precision, independently calibrated mass flow controllers providing extremely accurate, programmable gas control. The ability to control gas flow with accuracy assures a stable baseline and accurate determination of gas volumes.
• Analysis gas may be introduced to the carrier stream by a precision automated loop. A calibrated, conveniently located septum is also provided through which analysis gas can be injected by means of a calibrated syringe.
• Thermal conductivity detector (TCD) is capable of detecting minute differences in the concentration of gases flowing into and out of the sample reactor. Its corrosionresistant filaments are operated at constant temperature to prevent thermal runaway, which can destroy filaments in other systems.
• A clamshell furnace can heat the quartz sample reactor up to 1100 °C. The AutoChem II 2920 permits any number of ramp rates and sequences to facilitate customized experiments. The included KwikCool feature permits cooling the furnace temperature rapidly down to near ambient, reducing analysis time and increasing throughput. With the CryoCooler option, analysis temperatures can be ramped over the range of -100 °C to 1100 °C.
• Four internal temperature-controlled zones can be heated independently of each other to as much as 150 °C. This prevents condensation in the flow path and allows studies to be performed with vapors.
• The extremely low volume of the internal plumbing minimizes peak spreading and significantly enhances peak resolution. Furthermore, it reduces the time lag between the sample reactions and the corresponding detector response.

Accessories

Quote accessories

Software Features and Data Reduction/Reporting

The easy-to-use AutoChem II software utilizes a Windows® interface that includes Wizards and applications to help plan, launch, and control the analysis. You can collect, organize, archive and reduce raw data, and store standardized sample information and analysis conditions for easy access during later applications.

• Set up analysis protocol sequencing from any number of preprogrammed experi- ments or create a customized sequence. The user can easily select the pretreat- ment and analysis task and specify criteria such as temperature ramp rates, gas flow rates, and data measurement intervals
• The instrument schematic screen displays the instrument’s current operating status, including the availability of analysis and pretreatment gases and vapors, direction of the gas flow, and TCD reading.
• Numerous plots can be overlaid for easy comparison of different samples or for comparison of different data reduction techniques Software Features and Data Reduction/Reporting

 

Powerful Peak Editor

Fully integrated, interactive peak editor package enables the user to evaluate results quickly and easily, edit peaks, and produce reports that reflect specific needs. Adjusting peak boundaries is a matter of simply pointing and clicking. The Peak Editor can also be used to deconvolute overlapping peaks.

The AutoChem II Also Includes

• Ten user-configurable graphical reports
• BET, Langmuir, and total pore volume
• Pulse chemisorption, % dispersion, metal surface area, and crystallite size
• First-order kinetics, heat of desorption, and activation energy
• Integration of mass spectrometer data fil