Micromeritics Autochem Chemisorption Analyser

Micromeritics AutoChem series offer fully automated catalyst characterisation system for highly precise chemical adsorption and temperature programmed reaction studies.

Micromeritics Autochem Chemisorption Analyser

Micromeritics AutoChem series offer fully automated catalyst characterisation system for highly precise chemical adsorption and temperature programmed reaction studies.

Manufacturer Micromeritics
Product SeriesMicromeritics AutoChem
Measurement principleChemisorption
ApplicationSurface Area & Porosity
Temperature-100 °C to 1100 °C with CryoCooler
Gas Flow Rate (manual)0 to 100 mL/minute (Hydrogen)
Gas Flow Rate (Auto)10 to 75 mL/minute

Product Overview

Micromeritics AutoChem series offer fully automated chemisoprtion analysis for an array of highly precise chemical adsorption and temperature-programmed reaction studies. The instrument gives users the ability to obtain valuable information about the physical properties of catalysts, catalyst support and a variety of other materials.

Users can perform a variety of experiments which include pulse chemisorption, temperature-programmed reduction (TPR), desorption (TPD), oxidation (TPO), and reaction analyses. Catalytic properties such as percent of metal dispersion, active metal surface area, acid strength, surface acidity, distribution of strength of active sites, BET surface area can quickly be determined.

Choice of 2 model options: 

AutoChem II 2920 – Catalyst Characterisation Laboratory in a Single Instrument

This fully automated chemisorption analyser has four internal temperature-controlled zones can be heated independently up to 150 °C which prevent condensation. The low internal plumbing volume assures high resolution, fast detector response and reduces error when calculating gas volumes. The sensitive linear thermal conductivity detector (TCD) assures the calibration volume remains constant. Four high-precision, independently calibrated mass flow controllers provide extremely accurate, programmable gas control.

AutoChem 2950 HP – Catalyst Characterisation under High Pressure 

This automated, bench-top, microreactor system is designed for catalyst characterisation up to 70 atmospheres (1000 psia) and temperatures from -100 to 1100°C. High-quality hardware, a simple-to-use software interface, and a report system that allows users to determine active surface area and activation energy make this bench-top instrument ideal for researchers who want to conduct experiments and characterise their materials at conditions approaching commercial operation. 

  • BENEFITS
  • APPLICATIONS

BENEFITS

Four internal temperature-controlled zones can be heated independently up to 150°C. This prevents condensation in the flow path and allows studies to be performed with vapors.
• Low internal plumbing volume assures high resolution, fast detector response, and reduces error when calculating gas volumes.
• Highly sensitive linear thermal conductivity detector (TCD) assures the calibration volume remains constant over the full range of peak amplitudes so the area under the peak is directly proportional to the volume of gas reacted.
• Four high-precision mass flow controllers provide extremely accurate, programmable gas control. This assures a stable baseline and accurate determination of gas volumes.
• Corrosion-resistant detector filaments are compatible with most destructive gases and reduce the likelihood of fila- ment oxidation.
• Clamshell furnace can heat the quartz sample reactor to 1100 °C. Any number of ramp rates and sequences facilitate customized experiments. The KwikCool feature cools the furnace temperature rapidly down to near ambient, reducing analysis time and increasing throughput.
• Four gas inlets each for the preparation, carrier, and loop gases permit four-gas sequential experiments, such as TPR/TPO cycles.
• Mass spectrometer port and software integration allows virtually simultaneous detection on both the thermal conductivity detector and mass spectrometer.
• Optional Vapor Generator permits analysis using vaporised liquids in an inert carrier stream.
• Optional CryoCooler enables the start of an analysis at sub-ambient temperature

APPLICATIONS

Catalysts

Chemisorption experiments are valuable for the selection of catalysts for a particular purpose, qualification of catalyst vendors, and the testing of catalyst performance over time to establish when the catalyst should be reactivated or replaced.

Fuel Cells

Platinum-based catalysts including Pt/C, PtRu/C, and PtRuIr/C are often characterized by temperature-programmed reduction to determine the number of oxide phases and pulse chemisorption to calculate:

  • Metal surface area
  • Metal dispersion
  • Average crystallite size

Partial Oxidation

Manganese, cobalt, bismuth, iron, copper, and silver catalysts used for the gas-phase oxidation of ammonia, methane, ethylene, and propylene are characterized using:

  • Temperature-programmed oxidation
  • Temperature-programmed desorption
  • Heat of desorption of oxygen
  • Heat of dissociation of oxygen

Catalytic Cracking

Acid catalysts such as zeolites are used to convert large hydrocarbons to gasoline and diesel fuel:

  • Ammonia chemisorption
  • Temperature-programmed desorption of ammonia
  • Temperature-programmed decomposition of alkyl amines
  • Temperature-programmed desorption of aromatic amines

Catalytic Reforming

Catalysts containing platinum, rhenium, tin, etc. on silica, alumina, or silica-alumina are used for the production of hydrogen, aromatics, and olefins:

  • Metal surface area
  • Metal dispersion
  • Average crystallite size

Isomerisation

Catalysts such as small-pore zeolites (mordenite and ZSM-5) containing noble metals (typically platinum) are used to convert linear paraffins to branched paraffins. This increases the octane number and value for blending gasoline and improves the low temperature flow properties of oil:

  • Temperature-programmed reduction
  • Pulse chemisorption

Hydrocracking, Hydrodesulphurisation, and Hydrodenitrogenation

Hydrocracking catalysts typically composed of metal sulfides are used for processing feeds containing polycyclic aromatics that are not suitable for typical catalytic cracking processes. Hydrodesulfurisation and hydrodenitrogenation are used for removing sulfur and nitrogen respectively from petroleum feeds:

  • Temperature-programmed reduction
  • Oxygen pulse chemisorption

Fischer-Tropsch Synthesis

Cobalt, iron, etc. based catalysts are used to convert syngas (carbon monoxide and hydrogen) to hydrocarbons larger than methane. These hydrocarbons are rich in hydrogen and do not contain sulfur or nitrogen:

  • Temperature-programmed desorption
  • Pulse chemisorption

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