DVS Carbon
CO₂ & H₂O gravimetric sorption analyzers

Benefits

• The only purpose-built system to measure carbon capture properties of materials in real-world conditions
• Employs specially redesigned, patented Speed of Sound Sensor for accurate real-time precision
• Open stainless steel stand design enabling easy access to sample pan while minimizing static electric charging
• Broad temperature range (5-85 °C) with a single, uniform, and accurate temperature enclosure
• Sample heater enabling local temperature control up to 300 ^oC, for activation, drying, etc.
• Heated reservoir for extended humidity generation (98% RH up to 60 ⁰C and 85 %RH up 85 ^oC), with fully automated temperature control
• Next-generation control and evaluation software for the most advanced experimental design and data analysis
• Optional accessories to enable Raman or NIR spectroscopy as well as video

Capabilities

• CO₂ and H₂O sorption and desorption isotherms & kinetics
• Independent multicomponent control and mixing
• Optional in-situ sample preheating/drying to 300 °C
• Multiple sorption/desorption and sample drying or activation cycles
• Sample masses from up to 5000 mg
• Surface and bulk measurement capabilities and analyses

Applications

• Carbon capture
• Post-combustion capture
• Carbon sequestration
• Temperature/moisture swing sorption
• Direct air capture
• Solid sorbent characterization

Specifications

Construction Materials

Custom built manifold: 316 stainless steel
Seals: Viton® and Kalrez® or equivalent
Tubing: 1/4 inch 316 stainless steel

Gas Flow Control

High accuracy digital mass flow controllers
Wide dynamic range – turndown ratio 1000:1
Carrier gas: dry air, nitrogen, CO₂ (<1%) in nitrogen

Temperature Control

Temperature controlled enclosure
Contains entire generation and measurement system
Control range: 5 °C to 85 °C
Temperature stability ± 0.05 ^oC over 6 hours
Temperature resolution 0.01 °C

Local sample heater
Control range: up to 300 °C
Heating ramp rates: up to 10 °C/min

Humidity Generation & Measurement

Water Reservoirs
500 mL quick-fit reservoir
Heated to avoid evaporative cooling

Generation
Relative humidity range

• 0 to 98% RH for 5-60 ^oC ¹
• 0 to 85% RH for 60-85 ^oC ¹

Relative humidity generation performance

• Accuracy: ±0.5% RH ²
• Resolution: ±0.1% RH
• Stability: ±0.1% RH over 6 hours

Measurement
Relative humidity continuous measurement

• Range 0-100%RH

Relative humidity measurement accuracy

• ±0.8% RH at 5-40 °C
• ±1.5% RH at 40-85 °C

CO₂ Generation and Measurement

Generation
Concentration range 0-100% vol, atmospheric pressure

CO₂ generation performance

• Accuracy: exact 3 or 0.5% vol of inlet concentration ⁴

Measurement
Patented Speed of Sound sensor

• Range: 0-100% vol ⁵
• Accuracy: 0.1% vol up to 40% vol, 0.5% above

In line NIR ppm sensor ^6,7

• Range 0-0.5% vol
• Accuracy: 40 ppm ⁵

Weight Measurement

Ultrabalance Low Mass
Maximum load: 1000 mg
Mass change: ±150 mg
Resolution: 0.01 μg
Balance noise: ≤ 0.3 μg ⁸

Ultrabalance High Mass
Maximum load: 5000 mg
Mass change: ±1000 mg
Resolution: 0.1 μg
Balance noise: ≤ 3 μg⁸

Hardware Configuration

Standard

• Mixing of two gas streams, with controlled humidity and CO₂ concentration, respectively ⁹
• Switching between different carrier gases e.g. Nitrogen and 400 ppm CO₂

Advanced

• Two heated reservoirs for enhanced humidity generation at high CO₂ levels (up to 98% humidity in a pure CO₂ stream) ⁹
• Mixing and direct measurement of low CO₂ concentrations (ppm level) through dedicated instrumentation⁹

System Information

Dimensions: 520 mm (W) x 980 mm (H) x 610 mm (D)
Weight: 80 kg (180 lb)
Electrical: 200-240 V, 50/60 Hz, 1500 VA

System Software

DVS Control Software

• Live data view and plotting
• Full control over all parameters
• Powerful custom methods and sequences
• Complex isotherm or isobar experiments
• Temperature changes in a single experiment
• Ramp or step methods available
• Intelligent (dm/dt) or time based step equilibration criteria
• Multiple concentration or temperature cycles.
• Automated video image or Raman spectra acquisition

DVS Analysis Software

• Automated isotherm calculation
• Full kinetics information during experiment
• Isotherm modeling
• Isotherm modeling
• Enthalpy (heat) of adsorption
• Permeability and diffusion modeling
• Surface area models

Software Options:

Standard

• Control software
• Standard analysis

Advanced

• Advanced analysis suite
• Isotherm analysis suite

 

_{Footnotes:
1 Humidity factory calibrated at 25°C and 70°C. Calibrations at other temperatures upon request
2 1-σ confidence level with % RH based on SMS factory certified methods (Salt Calibration)
3 When using pure CO2 or a calibrated cylinder
4 When mixing
5 At 25°C
6 Only in advanced configuration
7 Using ppm probe reduces maximum operating T to 60 °C
8 Root mean square (averaged over 24 hours)
9 Some measurement restrictions apply}

Schematics