Ind. Eng. Chem. Prod. Res. Dev., Vol. 17,No. 2, 1978
128
90r
0 0-100 hrs A 300- 400 hrs
- 600 hrs 0 700- B O O h n V $02- FREE DATA AT 7 0 0 hrs 0 900-1000 hrs
0 500
SOLID LINE PRE-EXPOSURE COMPOSiTE DATA
10 -
Downloaded by NANYANG TECHNOLOGICAL UNIV on August 25, 2015 | http://pubs.acs.org Publication Date: June 1, 1978 | doi: 10.1021/i360066a008
I
of NO, on the Fe-Cr (9/1) catalyst in simulated flue gas containing SO, was studied for over 1000 h continuous operation of the reactor. Concentrations of NO, "3, and SO:! (at the mixing manifold) were varied over 890-1160,670-1370, and 490-1500 ppm, respectively. In the inlet mixing process some SO2 oxidized to SO3. As much as 225 ppm of SO:, was present in some tests; typical levels of SO3 were about 100 ppm. There was no evidence of appreciable catalytic oxidation of SO:! in the reactor. Reasonable agreement between inlet and outlet total SO, concentrations was obtained. Table V provides some typical experimental data during the durability tests a t 400 "C. There was negligible degradation of the catalyst activity
during the 1052 h test period. Figure 9 also shows that there was no overall decrease in the conversion of NO. In fact, the catalyst activity increased somewhat (the solid line is a composite of data for pre-SO, exposure tests), particularly at low NH3/NO ratios (
