The formation of isocyanic acid during the reaction of NH with NO and excess CO over silica-supported platinum, palladium, and rhodium
作者:N CANT、D CHAMBERS、I LIU
DOI:10.1016/j.jcat.2005.01.022
日期:2005.4.1
The reaction between NH3 and NO in excess CO over silica-supported platinum, palladium, and rhodium has been investigated for temperatures from 100 to 450 °C. As found previously for the corresponding reactions of H2/NO/CO mixtures, isocyanic acid (HNCO) is produced with each catalyst. With Pd/SiO2, the peak yield when NH3 is used is 46% based on the total nitrogen converted and 55% based on the hydrogen
已经研究了在100至450°C的温度下,与二氧化硅负载的铂,钯和铑相比,过量CO中的NH 3和NO之间的反应。如之前对于H 2 / NO / CO混合物的相应反应所发现的,每种催化剂都会生成异氰酸(HNCO)。对于Pd / SiO 2,使用NH 3时的峰值产率为46%(基于转化的总氮)和55%(基于从NH 3吸收的氢),其余的氢转化为水。Pt / SiO 2上的反应需要更高的温度,效率更高,HNCO的最高产率(基于氮)为70%,基于氢为95%。几乎没有水作为产物与铂从H 2 O / NO / CO混合物生产HNCO的高活性有关,而铂的高活性又是由水煤气变换反应的活性驱动的。NH 3 / NO / CO混合物中的HNCO的峰值收率与Rh / SiO 2相比要低得多(基于氮为10%),并且与铂和钯催化剂的收率不同,该收率低于在H2CO处理过程中观察到的收率。 H 2 + NO + CO反应(30%)。在使用15