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本文利用装备有程序控温反应池、抽空和质谱检测脱附物系统的FT—IR,在室温条件下研究了CO在Rh/SiO_2催化剂上的化学吸附态及其与O_2、NO、H_2的反应性能。实验站果表明:CO在Rh/SiO_2催化剂上存在着Rh(CO)_2[Ⅰ]、Rh(CO)[Ⅱ]和Rh_2(CO)[Ⅲ]三种化学吸附态;它们与O_2及H_2的反应活性顺序是[Ⅰ]>[Ⅱ](?)[Ⅲ];NO能从催化剂表面上置换CO吸附态[Ⅱ],並相应在此吸附位上产生两种吸附态Rh(NO)及RhO_2(NO);通过对CO和H_2共吸附、吸附的CO和H_2反应及H_2CO吸附的化学吸附态的检测及其脱附产物的质谱分析,说明了在Rh/SiO_2催化剂上CO和H_2反应过程中无H_2CO中间物产生。
In this paper, the chemical adsorption state of CO on Rh / SiO 2 catalyst and its reaction with O 2, NO and H 2 were investigated at room temperature using a programmed temperature-controlled reaction cell, evacuation and mass spectrometry. performance. The experimental results show that there are three chemical adsorption states of Rh (CO) _2 [Ⅰ], Rh (CO) [Ⅱ] and Rh_2 (CO) [Ⅲ] on Rh / The reaction order is [Ⅰ]> [Ⅱ] (?) [Ⅲ]; NO can displace CO adsorbed state from the surface of catalyst [Ⅱ] and correspondingly produce two kinds of adsorbed Rh (NO) and RhO_2 (NO); Through the CO and H 2 co-adsorption, adsorption of CO and H 2 reaction and H 2 CO adsorption chemisorption detection and mass spectrometry analysis of desorption products, indicating that the Rh / SiO 2 catalyst CO and H 2 reaction process No H_2CO intermediate produced.