Catalyst
Catalyst
(OP)
When comparing catalyst prices, should one compare the cost per weight of catalyst or cost per volume of catalyst? The catalyst pellets are similar in size and have similar compositions but one is reported with an 18% higher bulk density than the other.





RE: Catalyst
m777182
RE: Catalyst
RE: Catalyst
And before it is used, it needs to be activated to make it active and this process involves some weight loss like moisture and other volatiles.
RE: Catalyst
Costs of production including catalysts' useful lifes should be added in the economic analysis.
RE: Catalyst
First of all, catalyst, even presulfided, is paid on oxidic weight basis, so weight losses during in-situ activation are not relevant.
You may want to check the basis of the densities of the two cats, are both oxidic basis, are the measurement methods comparable? What about the void fractions, does one of the two give you a pressure drop advantage?
Then, know what the objective of your reactor: do you want to fill it with cheap cat for a low-severity service, you will want to take the cheapest per volume that does the job.
If you need the highest activity possible, ask your research lab to compare the iso-volume activities (the denser one is not necessarily more active) and see if the delta activity outweighs the delta price. Is troughput limited by this reactor's performance or by something else? Difference in expected lifetimes of both cats can be calculated from delta operating temperature (calculated from delta activity) versus max EOR temp assuming equal stability which may or may not be the case.
Yes it gets quite complicated if you want to do it right! Can't give you an easy recipe. Anyway, don't hesitate and make those cat vendors sweat for you, ask them for a design and compare the two.
RE: Catalyst
How often the cat can be regenerated depends 99% on your operation (feed quality), check the unit history.
RE: Catalyst
RE: Catalyst
The gross volume will be calculated based on knowing the weight of the catalyst and its density.
Hope this would help you.
Cheers
Simulator
RE: Catalyst
RE: Catalyst
If I remember right, this is a mainly a Gross Surface Area reaction that is diffusion limited. You will need to see check the difference in metals loading between the two catalysts. Basically you are looking for accessible metal so bulk density may not actually give you more accessible active metal.
I would check the reference list for the catalyst and see if you can get any run length details on a simlar plant to your own. There are only a handful of sour shift applications in North America but I understand that Asia has a lot.
Hope this helps