Page 100 - Principles of Catalyst Development
P. 100
DESIGN OF CATALYSTS 87
CH 4 + O2 = CH2 0 + H20 01, DH,O -70.9 kcal mole- 1
= HCOOH + H2 01, DH,O -67.0
= CO + H2 + H2 0 OI,DH,O -87.3
= CO2 + 2H2 01, DH,O -90.5
CH 4 + ~02 = CH20 + H2 0 2 OI,DH,O -31.0
= HCOOH + H2 0 01, DH, 0 -119.8
= CO + 2H 20 01, DH,O -136.5
= CO2 + H2 + H20 OI,CH,O -139.8
OI,DH,O -98.6
CH 4 + 20 2 = HCOOH + H2 0 2
= CO + H 20 2 + H 20 01, DH,O -118.7
= CO 2 + 2H 20 01, DH,O -189.5
Reactant - Product Reactions:
CH 4 + C2H6 = C)Hs + H2 DH,A 16.6
CH 4 + C2H4 = C3 HS A 4.5
CH 4 + CH)OH = C2HsOH + H2 DH,A 10.5
!02 + H2 = H2 0 01 -50.3
~02 + C2H6 = C2HsOH 01 -30.7
!02 + CHzO = HCOOH 01 -45.3
0 -9.2
5.2.2. Thermodynamic Analysis
The objectives in this step are to assess thermodynamic feasibility for
each of the stoichiometric equations and to list them in groups with the
same chemical functions. For clarity, many intermediate reactions have
been omitted from the rearrangements below. Reactions with aG~ values
greater than 10 kcal mole- are not included at this point.
1
CH 4 + 202 = CO2 + 2HzO OI,DH,O -189
CH 4 + O2 = CH2 0 + H 2O 01, DH,O -70
CH 4 + O2 = HCOOH + H2 OI,DH -67
CH 4 + ~02 = CH 20 + H2 OI,DH -20
CH 4 + 102 = CH 30H 01 -22
CH 20 = CO + H2 DH -17
CH 30H = CHzO + Hz DH 2
At this stage, the reactions are examined for common trends. For
example, the target reaction is in the same grouping as combustion or
oxidation. Attempts to build these functions into the catalyst result in poor