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water gas shift reaction

water gas shift reaction

water gas shift reaction

(OP)
Hi. I am doing water gas shift reaction on syngas produced by pyrolysis.
I am looking for the temperature needed for such a reaction
and what kind of catalyst should be used.
The outcome desired is CO2 and hydrogen
The composition of the syngas is co, co2, h2, ch2, c2h4, c2h6, c3h5, and others

RE: water gas shift reaction

High temp shift reaction usually uses some chromium doped iron catalyst. Low temp shift reaction uses a CuO catalyst. Many manufacturers for such catalysts, such as Haldor Topsoe, who have licensed manufacturing facilities at Chiyoda sites in Japan also.
What is "Ch2 - you mean C2H2 ?
C2H4, C3H6 and C2H2 may cause catalyst deactivation by plugging of active sites with carbon - syngas may need to dewpoint treated to remove these olefins. Vaguely recall Brown and Root had some license for expander based syngas dewpoint conditioning. There may be many companies offering such processes now.

RE: water gas shift reaction

(OP)
thanks georgeverghese what is the range of high temp and what is the range of low temp.
CH2 is methylene
I will contact Topsoe and Brown and Root

Thanks a million

Ray

RE: water gas shift reaction

Lo temp shift reactor (LTS) runs at about 250degC, high temp (HTS) at about 350degC.
CH2 is the methylene radical - it does not exist as a stable chemical.
BASF and Johnson Mathey also manufacture these catalysts.

RE: water gas shift reaction

(OP)
Dear georgeverghese Thanks so much for the info. I have a design for the reactor could you please tell me if it is a good design. It is horizontal not vertical to make the gases come in contact with more catalysts. Is this a good design or should we go with a vertical design


RE: water gas shift reaction

It is difficult to maintain uniform tube temp (with gas burners for temp control) in a tubular horizontal reactor in industrial large scale practice - I have come across vertical configuration only. A HTS / LTS reactor licensor designer may be able to advise for smaller scale units like this one for 5m3 only.

RE: water gas shift reaction

(OP)

Dear georgeverghese

We modified the design to a vertical one with the gas inlets at the bottom making the gasses pass through the catalyst.

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