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1.前言 关于负载过渡金属的沸石体系,其CO吸附态的研究较少。就已报导的几篇论文看,载镍沸石上CO的行为与载镍氧化物上大不相同。如在NiY沸石上,吸附CO时不仅在2170和2120cm~(-1)附近有吸收带,而且在更高的频率约2200cm~(-1)也呈现吸收峰;但在载镍氧化物体系上就观察不到。对上述3个峰的归属目前仍无定论。已经报导的也互相矛盾。为此,本文藉原位红外光谱探讨了CO在NiY沸石上的吸附,并通过与不载镍沸石和非晶形SiO_2 -A1_2O_3体系比较,对上述3个峰的归属提出初步看法。
1. Introduction There are few studies on the adsorption states of CO on zeolite loaded with transition metal. Several articles have been reported that the behavior of CO on nickel zeolites is quite different from that of nickel oxides. For example, on NiY zeolite, not only absorption bands near 2170 and 2120 cm -1 but also absorption peaks at 2200 cm -1 higher frequency are observed for CO adsorption. However, Can not observe. The ownership of these three peaks is still inconclusive. The reports have also contradict each other. In this paper, the adsorption of CO on NiY zeolite was investigated by in-situ FTIR spectroscopy. The preliminary results of the adsorption of CO on NiY zeolite were compared with that of uncoated NiO zeolite and amorphous SiO 2 -Al 2 O 3 system.