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Catalytic properties of NiX zeolites in the presence of ceriumadditives

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Fig.  1. Effect  of  Ce”+  additives  on the TPR  profiles  for  NiX  zeolites.  Carrier gas, HZ-Ar  (1:  10);
Fig. 2. Effect  of  Ce3+ additives  on the TPD  profiles  for NiX  zeolites.  (A)  5 wt.-%  Ni;  (B)  5-2.5  Ni-Ce;  (C)  5-5  Ni-Ce;  (D)  5-10  Ni-Ce
Fig.  3.  TPD  profiles  of  5-5  Ni-Cc/X  reduced  at  various  temperatures  as  indicated
Fig. 4 shows the effects  of Ce3+ additives  on the IR spectra of carbon  monoxide  adsorption  over various cerium-containing  nickel/zeolite  catalysts under a low-  pressure  atmosphere  of  carbon  monoxide  (PC0 =  1  Torr  1
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