What is correct about the anode and cathode?
Water electrolysis has a standard potential of 1.23 V. This means that...
Classify these by increasing density:
H1: Hydrogen at 1 bar, 25 °C
H350: Compressed hydrogen, 350 bar, 25 °C
H750: Compressed hydrogen 750 bar, 25 °C
LH2: Liquid hydrogen
Consider an ideal gas in a perfectly isolated container, with constant volume. If we heat the container, the pressure will...
The three-phase boundary in PEM electrolyzers is where:
Classify these hydrogen production methods from smallest to largest global hydrogen production.
(4%, 18%, 30%, 48%)
Electrolysis
Steam methane reforming
Coal reforming
From oil
Electrolysis Ca. 4 %
Steam methane reforming Ca. 48 %
Coal reforming Ca. 18 %
From oil Ca. 30 %
The ideal gas law is best suited for:
The GDL/PTL in PEM electrolysis has the following functions:
The bipolar plate:
The electrolyte in alkaline electrolysis...
What is most correct about the hydrogen atom?
A gas has a pressure of 27 bar, a temperature of 34 ºC and volume of 5 L. How many moles of gas do we have:
How can we increase the yield of steam-reforming of methane?
Why do we perform the water-gas-shift (WGS) reaction in methane steam reforming?
What are the advantages of doing thermal pyrolysis of natural gas to make hydrogen?
What is true about catalysts?
Which of these can be a function of the salt bridge?
A gas is in a container with volume = 5 L, n = 3 mol, p = 900 torr and T = 298 K. What is the new pressure if we increase the temperature to 398 K?
Given a gas with n = 1,7 mol and V = 9 L. We imagine two scenarios:
A) The temperature is increased from 300 K to 400 K
B) The temperature is increased from 400 K to 500 K
For the galvanic cell Al || Al3+ and Ag || Ag+, calculate the standard cell potential:
Storing liquid hydrogen...
Range these substances by their volumetric energy-density:
low- high - higher - highest
Liquid ammonia
Liquid hydrogen
Hydrogen at 750 bar
Biodiesel
Liquid ammonia Higher
Liquid hydrogen High
Hydrogen at 750 bar Low
Biodiesel highest
What is true about hydrogens effect on the environment?
Liquefying hydrogen always follows the following steps:
When we compress hydrogen:
What is the difference between higher and lower heating value?
The partial pressure of an ideal gas mixture....
Pair these pressures with their different applications:
Ca. 350 bar Ca. 750 bar Ca. 1.5 bar Ca. 15-30 bar
A long distance truck hydrogen pressure
A hydrogen personal car hydrogen pressure
Liquid hydrogen pressure at production
Steam reforming of natural gas
A long distance truck hydrogen pressure Ca. 350 bar
A hydrogen personal car hydrogen pressure Ca. 750 bar Liquid hydrogen pressure at production Ca. 1.5 bar
Steam reforming of natural gas Ca. 15-30 bar
In the Haber Bosch process:
What is true about hydrogen, ammonia and methane?
Above the critical temperature of a gas:
Electrochemical compression of hydrogen:
Catalyst poisoning:
When we store equal amount by mass of liquid and compressed hydrogen:
When we liquefy hydrogen
Consider the following energy transfer chain:
Solar radiation - PV solar panel - water electrolyzer - fuel cell
We would like the total effienciency of the energy transfer to be as high as possible.
In autothermal reforming:
The first reaction in steam reforming:
If we compare a PEM and alkaline electrolyzer:
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