Maurice Tutor

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Teaching Since: May 2017
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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 04 Oct 2017 My Price 7.00

‘‘nanostructured’’ catalyst

Consider the novel ‘‘nanostructured’’ catalyst shown in the following figure.

The catalyst support consists of an ordered array of cylindrical ‘‘nanowells’’ of 50nm diameter and 200 nm depth (1 nm = 10-9 m). A catalytic surface coats of the bottom of each well. Although gas flows over the catalyst surface, the gas space within each ‘‘well’’ is stagnant, that is, not well mixed. In the present application, the catalyst surface is used to convert unreacted H2 gas (species A) and O2 gas (species B) from a fuel cell into water vapor (species C) according to the reaction

For our first approximation, consider the reaction diffusion limited within the catalyst well. The process is isothermal at 473 K and isobaric at 1.25 atm total system pressure.

a. State reasonable assumptions for this process. What is the simplified form of the general differential equation for the mass transfer of hydrogen? What is the simplified form of Fick’s equation for hydrogen? Consider O2 is the dominant species and both H2 and H2O are dilute.

b. What is the effective diffusion coefficient of H2 gas inside each nanowell if we have a dilute system with bulk gas mole fraction compositions for yH2 = 0:01 and yH2O = 0:01. What is the flux of H2?

 

Answers

Maurice Tutor
(5)
Status NEW Posted 04 Oct 2017 10:10 PM My Price 7.00

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