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Technologies

Advanced Gas Sorption Analysis SystemManual Version

www.grz-technologies.com

AGAS Mano

0 0.5 1 1.5

100

101

100°C80°C60°C40°C20°C

0 0.5 1 1.5

100

101

100°C80°C60°C40°C20°C

100

101

102

AbsorptionDesorption

2 2.5 3 3.5

• Dynamic pressure composition isotherms

• Pressure-composition quasi-static equilibrium isotherms (Sieverts)

• Kinetic Sorption Measurement (Arrhenius)

• Desorbed Gas Analysis (Mass Spectrometer)

Measurement Capabilities

What is AGAS Mano

Specifications• Measuring Pressure Range: 0-100 bar• Measuring Temperature Range: 298K – 473K (standard), 77K – 773K (optional)• Pressure measurement accuracy: ±0.35% of the full range• Hydrogen flow rate in dynamic mode: 0 – 5 Nml/min (customizable)

AGAS is an advanced gas sorption analysis systemAGAS is simple and user-friendlyAGAS combines the quasi-static (Sieverts) and dynamic

measurement modes in a single deviceAGAS comes with an integrated data analysis software

Pres

sure

[bar

]

1/T [K-1]

Van’t Hoff plot

cH2[H/M]

p eq [b

ar]

Dynamic Pressure-Composition Isotherms (pcI) Measurement and Determination of the Enthalpy and Entropy of Reaction

Absorption Desorption

cH2[H/M]

p eq [b

ar]

The pcI are measured at a constant flow rate of 1 Nml/min-g and allow determining the enthal-py and entropy of reaction of (LaCe)(NiCoMn)5

• Reaction Enthalpy:

-26.7 ± 1.7 kJ/mol (Abs.), 28.2 ± 1.7 kJ/mol (Des.)

• Reaction Entropy:

101.0 ± 5.1 kJ/mol (Abs.), 101.8 ± 5.1 kJ/mol (Des.)

0.05 0.06 0.07 0.08 0.09 0.12

3

4

5

6

7

8

100°C80°C60°C40°C20°C

0 0.5 1 1.5

10 0

10 1

Abs. @ 5 Nml/minAbs. @ 3 Nml/minAbs. @ 1 NmlDes. @ 1 Nml/minDes. @ 3 Nml/minDes. @ 5 Nml/minExtrapolation to 0-Flow

0 0.5 1 1.5100

101

Dynamic ModeQuasi-Static Mode (Sieverts)

0 1 2 3 4 52

3

4

5

6

7

8

AbsorptionDesorption

50 100 150 200 250 300 350 400 450 5000

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

0

1

2

3

4

5

6

7

8

Measurement ResultsComparison of the Quasi-Static

(Sieverts) with the Dynamic (Mass Flow) pcI Measurement

Pres

sure

[bar

]

H2 Concentration [%mass]

Comparison of the quasi-static (Sieverts) method with the dynamic (Mass-Flow) meth-od for the pcI (Absorption) measurement of

(LaCe)(NiCoMn)5 at 40°C.

cH2 [%wt]

p [b

ar]

Determination of the “True” Equilibrium Pressure by Extrapolation to Zero Flow Rate

p 0 [b

ar]

Flow rate [Nml/min]

The measurement of pcI curves at different flow rates allow determining the “true” equilibrium pressure by extrapolation to zero-flow.

Determination of the Critical Tempearture and H-H Interaction Energy Using the

Lattice Gas Model

ln [p /

p0(1

-cH/c

H)2 ]

cH [H/(LaCe)]

The lattice gas model allows determining the in-teraction energy between two hydrogen atoms in the metal lattice and the critical temperature at which the two-phase mixture no longer exists.

• H-H interaction energy: ε0=2.12 eV

• Critical temperature: TC=542°C

Thermo-Desorption of Complex Hydrides

Measurement of the hydrogen desorption flow as a function of the different temperatures.

Flow

rat

e [c

m3 /

min

]

Temperature [°C]

m(H

2) [m

ass

%]

Technologies

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RZ Technologies, All rights reserved

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info@grz-technologies.com

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