Praying Mantis™ High Temperature Reaction Chambers

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The Praying Mantis™ High Temp. Reaction Chamber is particularly effective for powders that have high surface areas. This makes diffuse reflectance a valuable tool for studying heterogeneous catalysis, gas-solid interactions, photochemical reactions, and oxidation mechanisms. This High Temperature Reaction Chamber is well suited for performing such studies under carefully controlled temperatures and pressures. High Temp. Reaction Chamber applications allow diffuse reflection (DRIFTS) spectroscopic measurements under controlled pressures and a wide range of temperatures. It is used in conjunction with the Praying Mantis™ Accessory for FT-IR and UV-VIS diffuse reflectance spectroscopy. Also available for Raman spectroscopy.

High Temp. Reaction Chamber (FTIR, KBr)
Praying Mantis diffuse reflection environmental chamber, 24V
Model No.
HVC-DRP-5
Price
N/A
High Temp. Reaction Chamber (UV-Vis-NIR)
Praying Mantis diffuse reflection environmental chamber, 24V
Model No.
HVC-VUV-5
Price
N/A
High Temp. Reaction Chamber (FTIR, ZnSe)
Praying Mantis diffuse reflection environmental chamber, 24V
Model No.
HVC-DRM-5
Price
N/A
NOTE: A Model No. ending in "XXX" denotes spectrometer code.

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Features
  • Designed for operation from high vacuum (133 μPa or 10-6 torr) to 133 kPa (1 ktorr) with KBr windows or 1.5 MPa (11.3 ktorr) with ZnSe windows.
  • Achieves temperatures up to 910°C (under vacuum).
  • Readily adapted for operation up to 3.44MPa (25.8 ktorr) with an optional high-pressure dome.
  • Three inlet/outlet ports provided for evacuating the cell and introducing gases.
  • Made of chemically resistant 316 stainless steel.
  • Optional Silcotek/Restek inert coatings available for greater inertness and corrosion resistance.
  • Optional cooling cartridge available for moderate cooling or heating with a chiller or recirculator.
  • Alternative window assemblies available for microspectroscopy applications, including Raman.
Includes
  • Reaction Chamber.
  • Low-voltage heating cartridge.
  • K-type thermocouple.
  • Sample packing tool and spill tray.
  • Dome with two KBr or ZnSe windows and one glass observation window (FTIR configuration).
  • Dome with two SiO2 windows and one glass observation window (UV-Vis-NIR configuration).
 
Model No. Product Description Price
ATC-024-3 Temperature Controller, 110V

Tabletop model

N/A
ATC-024-4 Temperature Controller, 220/240V

Tabletop model

N/A
ATK-024-3 Temperature Controller Kit, 110V

Includes 110V Temperature Controller and USB to RS-485 Adapter

N/A
ATK-024-4 Temperature Controller Kit, 220/240V

Includes 220/240V Temperature Controller and USB to RS-485 Adapter

N/A
CHC-CHA-3 Low Temp. Reaction Chamber (FTIR)

Praying Mantis™ diffuse reflection environmental chamber, 24V

N/A
CHC-VUV-3 Low Temp. Reaction Chamber (UV-Vis-NIR)

Praying Mantis™ diffuse reflection environmental chamber, 24V

N/A
DRK-3-XXX Diffuse Reflection Catalysis Package, 110V

Kit with Praying Mantis, Reaction Chamber, Controller, etc.

N/A
DRK-4-XXX Diffuse Reflection Catalysis Package, 220V

Kit with Praying Mantis, Reaction Chamber, Controller, etc.

N/A
DRP-XXX Praying Mantis™

Diffuse reflection accessory

N/A
VPE-001 Vacuum Pump

Dual-stage oil sealed rotary vacuum pump

N/A
VPE-002 Vacuum Pump

Dual-stage oil sealed rotary vacuum pump

N/A
 
Model No. Product Description Price
007-085 VCO to Swagelok Adapter (English) 1/4" female VCO to 1/4" Swagelok N/A
116-998 VCO to Swagelok Adapter (Metric) 1/4" female VCO to 6 mm Swagelok N/A
ATC-USB-485 Temperature Controller USB to RS-485 Adapter For use with the Temperature Controller N/A
DRP-ASC Ambient Chamber (FTIR) for Praying Mantis Air-tight enclosure for diffuse reflectance N/A
DRP-ASC-VUV Ambient Chamber (UV-Vis-NIR) for Praying Mantis Air-tight enclosure for diffuse reflectance N/A
DRP-PDR Praying Mantis Purge Shield Use with the High Temperature Reaction Chambers N/A
HVC-COL HVC Cooling Cartridge Cooling Cartridge for the Praying Mantis Reaction Chambers N/A
HVC-DWA-2 Standard Reaction Chamber Dome, SiO₂ Dome for Praying Mantis Reaction Chambers N/A
HVC-DWA-3 High Press. Dome, SiO₂, for High Temp. Chamber Dome for Praying Mantis HVC Reaction Chambers N/A
HVC-DWI-2 Standard Reaction Chamber Dome, ZnS Dome for Praying Mantis Reaction Chambers N/A
HVC-DWI-3 High Press. Dome, ZnS, for High Temp. Chamber Dome for Praying Mantis HVC Reaction Chambers N/A
HVC-DWM-2 Standard Reaction Chamber Dome, ZnSe Dome for Praying Mantis Reaction Chambers N/A
HVC-DWM-3 High Press. Dome, ZnSe, for High Temp. Chamber Dome for Praying Mantis HVC Reaction Chambers N/A
HVC-DWP-2 Standard Reaction Chamber Dome, KBr Dome for Praying Mantis Reaction Chambers N/A
HVC-MRA Standard Reaction Chamber Raman Assembly, SiO₂ Window assembly for the High Temp. Reaction Chamber N/A
Windows
Model No. Product Price
WMD-U43 Window ZnSe 15 x 4 mm $250.00
WMD-U23 Window ZnSe 15 x 2 mm $149.00
WLD-U23 Window NaCl 15 x 2 mm $48.00
WHD-U23 Window BaF₂ 15 x 2 mm $119.00
WFD-U23 Window CaF₂ 15 x 2 mm $71.00
WPD-U23 Window KBr 15 x 2 mm $57.00
WAD-U23 Window SiO₂ 15 x 2 mm $51.00
WAD-U43 Window SiO₂ 15 x 4 mm $71.00
WID-U43 Window ZnS 15 x 4 mm $277.00
WED-U23 Window Si 15 x 2 mm N/A
Other
Model No. Product Price
008-144 Thermocouple, K-Type $103.00
116-439 Screen Set (2 each of the three sizes), 6.3 mm dia. $110.00
116-439-1S Screen Set (6), pore size 0.104 mm (0.0041"), 6.3 mm dia. $110.00
116-439-2S Screen Set (6), pore size 0.061 mm (0.0024"), 6.3 mm dia. $110.00
116-439-3S Screen Set (6), pore size 0.038 mm (0.0015"), 6.3 mm dia. $110.00
O-Rings & Gaskets
Model No. Product Price
ORV-024 Viton O-Ring, 1.254 OD (32mm), 1.114 ID $9.00
ORK-010 Kalrez O-Ring, 0.379 OD, 0.239 ID $66.00
ORV-010 Viton O-Ring, 0.379 OD, 0.239 ID $8.00
HVC-ORK Kalrez O-Rings for High Temp. Reaction Chambers $703.00
HVC-ORV Viton O-Rings for High Temp. Reaction Chambers $87.00
ORK-023 Kalrez O-Ring, 1.191 OD, 1.051 ID $72.00
ORV-023 Viton O-Ring, 1.191 OD, 1.051 ID $9.00
ORV-016 Viton O-Ring, 0.754 OD, 0.614 ID $9.00
ORK-016 Kalrez O-Ring, 0.754 OD, 0.614 ID $72.00
ORK-013 Kalrez O-Ring, 0.566 OD, 0.426 ID $72.00
ORV-013 Viton O-Ring, 0.566 OD (15 mm), 0.426 ID $8.00
116-429 PTFE Washer, OD 0.59" (15mm) $7.00
Heaters
Model No. Product Price
HVC-HT4 Heater Assembly for High Temp. Reaction Chambers $209.00
HTRS-26 Cartridge Heater, 0.25" x 1.24", 24V/100W $132.00
Praying MantisHigh Temperature Reaction Chambers

Diffuse reflection spectroscopy is a very sensitive method for detecting changes at the surface of rough materials in the infrared and UV-VIS. It is particularly effective for powders with a high surface area. This makes diffuse reflectance a valuable tool for catalysis, oxidation, and photochemical studies. However, measurements for these applications must be obtained in a carefully controlled environment.

For this purpose, Harrick Scientific offers two reaction chamber models for use in conjunction with the Praying Mantis Diffuse Reflection Attachment. Both reaction chambers are constructed of chemically resistant 316 stainless steel and can be heated up to at least 910°C under vacuum. These DRIFTS reaction chambers feature a sample cup that is part of a temperature-controlled sample stage. This stage incorporates a cartridge heater and K-type thermocouple. The electrical leads to the heater and thermocouple are located on the outside of the chamber for convenience. The stage is thermally isolated from the outer reaction chamber. A water-cooling jacket is provided to control the temperature of the outer chamber and windows during high and/or low temperature operation. The reaction chamber also features three gas ports for evacuating, pressurizing or flowing gas through the sample. These ports have 1/4" VCO fittings with Viton o-rings. One of these ports leads directly under the sample cup; the other two lead into the sides of the chamber.

Optically, this reaction chamber is designed to minimize reflection losses from the windows and maximize light interaction with the sample. The radiation enters and exits the chamber perpendicular to the two optical apertures. A third aperture is provided for viewing, illuminating, or irradiating the sample. This makes the reaction chamber useful for photochemical studies. The High Temperature Reaction Chamber includes two infrared windows, KBr or ZnSe, and a glass observation window for the FTIR, or two SiO2 windows and a glass observation window for the UV-Vis-NIR. These windows are mounted in a removable stainless steel dome using o-ring seals. This reaction chamber can be operated from high vacuum to two or three atmospheres with the KBr or SiO2 and glass windows provided. Other window materials are available for different wavelength regions. Low refractive index window materials should be selected to minimize reflection losses.

The High Temperature Reaction Chamber is designed for operation from room temperature up to 910°C under vacuum. It can be adapted for use at higher pressures by simply replacing the dome assembly. The optional high-pressure dome assembly utilizes two optical windows and a UV quartz observation window mounted in a stainless steel dome; windows for the high-pressure dome are 4mm thick. ZnS, ZnSe and UV quartz are offered for operation to 3.44 MPa (25.8 ktorr). At higher pressures, the maximum attainable temperature might be lower, due to heat losses that depend upon thermal charactericstics of the sample, reactant gas, and gas pressure..  For optimal temperature control, Harrick Scientific recommends our Temperature Controller for stable heating of the system. Heater and thermocouple connectors are compatible with this controller.

The Low Temperature Reaction Chamber, CHC-CHA, is designed for operation from -150°C to 600°C under vacuum. In addition to the heater incorporated in the sample stage, the CHC also features a cooling conduit connected to a dewar. The dewar can be filled with liquid nitrogen or other coolant to cool the sample stage below room temperature. For optimal temperature control, Harrick Scientific recommends our Temperature Controller for gradual heating of the system, both above and below room temperature. Heater and thermocouple connectors are compatible with this controller.

To evacuate these diffuse reflectance reaction chambers, use our reliable, compact, low-noise level Vacuum Pump with a minimum pumping speed of 1.4m3/hr. Compliant with international standards, it is suited both for use these reaction chambers and for general use in chemistry and research laboratories. Hermetically sealed by oil pressure controlled valves, the vacuum chamber is protected against inadvertent venting and oil backstreaming. This vacuum pump is supplied with a three foot length of ½" ID vacuum tubing and with the hardware to connect this tubing to the pump. Connections between this tubing and the HVC or CHC fittings (Cajon SS-4-VCO-1) are provided by the user.

Figure 1 shows several infrared spectra recorded with the High Temperature Reaction Chamber in the Praying Mantis Diffuse Reflection Attachment. Harrick's Temperature Controller was used to regulate the temperature.

 

Figure 1. Diffuse Reflection of Wyodak Coal a) after 24 hrs. of oxidation at 2.4KPa at 393°C,b) dried unoxidized samples, and c) the difference spectrum (a-b).