Hi
gh surface area, ordered mesoporous SBA-15 and Al-SBA-15 were syn
thesized usin
g published proceduresand used as suppor
t for Mo and W ca
talys
ts promo
ted wi
th Co and Ni. The molybdenum loadin
g was variedon Al-SBA-15 from 2
to 12 w
t %, and Co or Ni loadin
g was varied on 8%Mo/Al-SBA-15 from 1
to 5 w
t %.The suppor
t and ca
talys
ts were charac
terized by X-ray diffrac
tion (XRD), Bare
tt-Joyner-Halenda (BJH)pore-size dis
tribu
tion, Brunauer-Emme
tt-Teller (BET) surface area, Fourier
transform infrared (FT-IR),
tempera
ture-pro
grammed reduc
tion (TPR), and oxy
gen chemisorp
tion. The charac
teriza
tion resul
ts indica
ted
tha
t hexa
gonal mesoporous s
truc
ture is re
tained on Mo, CoMo, and NiMo ca
talys
ts. The TPR s
tudies indica
ted
tha
t there are si
gnifican
t differences in Mo reducibili
ties and reducible species
tha
t are presen
t on SBA-15and Al-SBA-15 suppor
ted ca
talys
ts. The ca
taly
tic ac
tivi
ties for
thiophene, hydrodesulfuriza
tion (HDS), andcyclohexene hydro
gena
tion (HYD) were carried ou
t as a func
tion of Mo and CoMo or NiMo loadin
gs a
t400
![](/ima<font color=)
ges/en
ti
ties/de
g.
gif">C on sulfided ca
talys
ts. The resul
ts indica
ted
tha
t the molybdenum is dispersed well up
to 8% Moloadin
g and 8 w
t % loadin
g is op
timum for ca
taly
tic ac
tivi
ties. Oxy
gen chemisorp
tion correla
ted well wi
thca
taly
tic ac
tivi
ty. The reducibili
ties of
the ca
talys
ts and
their rela
tion
to ca
taly
tic ac
tivi
ties are discussed. Acomparison of
the physicochemical proper
ties and ca
taly
tic ac
tivi
ties of Mo and W ca
talys
ts suppor
ted onSBA-15 and Al-SBA-15 is made.