Copyright © 2011, BCREC, ISSN 1978 2993 Recent literature review at a glance on Cu Cr catalysts development for various reactions
Ref. No
Catalyst prepn. method
Expmnt. Operating conditions Remarks
1. Hydrogenation
C 5
69 CuCr
2
O
4
Soybean oil hydrogenation, 200 C
and 6 atm Pre reduced catalyst deactivates due to disappearance of
CuII and CuI species and to the decrement of CuCr ratio on the catalyst surface
5C 20
Cu Cr O, co ppt. of hydroxide, caln 370
C Citral hydrogenation, 300 mg of
catal, 0.5 mL of substrate in 5 mL of decalin at 140
C, atm subatm pressure, batch reactor
At high pressure, unsaturated alcohol competes with initial reagent on hydro genation site; at low pressure,
this comp etition decreases, but the allylic alcohol is isomerized on another active site.
C 20
Cu CrAl, co ppt. of Cu and Al hydroxides
Crotyl alcohol, β methallyl alcohol, flow apparatus, reagent constant pp
20 Torr, atm. pressure Allylic alcohols react with H
2
and lead to several primary products, Cu
+1
promote hydrogenation, Cr
+3
Al
+3
isomeri sation and hydrodeoxygenation
C 71
CuCr
2
O
4
Fatty methyl ester hydrog. to fatty alcohol, semibatch reactor, low H
2
press elevated temp. Both activity and selectivity correlate well with the crys
tallinity of the copper chromite surface; they increase with decreasing crystallinity.
C 9
1 CuCr
2
O
4
pre reduced cat at 473, 573, or
673 K for 4 h Furfural crotonaldehyde , fixed bed,
15 g cat, temp. 423 473 K, press 730 Torr H
2
10 Torr furfural Both activity TOF for furfural and crotonaldehyde
hydrogenation reached their highest values after reduc tion at 573 K, compared to 473 and 673 K,
C 0 3
9 89
CuCr
2
O
4
Selective hydrogenation of furfural to furfuryl alcohol
Cu is the active phase, reduction with H
2
at 573 K for 4 h produced the highest specific activity of catalyst due to
the existence of maximum accessible Cu species
C 0 5
82 CuFe
x
Cr
2 −x
O
4
250 C, fixed bed flow reactor
Optimum composition, x=0.4, Cu
+1
at octahedral sites is more active than Cu
C 2 84
CuCr
2
O
4
Partial hydrogenation of vegetable oils fatty acids
Selective formation of allylic alcohols for perfumery synthesis of fragrances
C 6
91 CuCr
2
O
4
Treatment of CuCr
2
O
4
in H
2
at 180 370
C Exhibit activity in hydrogenation reactions including
ketone olefin
2. Cyclization 124
