Phosgene formation via carbon monoxide and dichlorine reaction over an activated carbon catalyst: Reaction testing arrangements

Phosgene Synthesis Catalysis: The Influence of Small Quantities of Bromine in the Chlorine Feedstream

“…Figure 1 presents a series of UV–visible spectra for individual Cl 2 and Br 2 feeds and Cl 2 /Br 2 mixed feeds that were passed over quartz powder located in the reactor bypass line at 295 K. Figure 1 a shows the single symmetric peak of the π*−σ* transition of Cl 2 with a peak maximum at 330 nm. 3 Figure 1 b presents the spectrum for Br 2 that is characterized by a peak maximum at 415 nm, but in contrast to that of Cl 2 , the peak intensity is skewed to longer wavelengths. This band is assigned to the π*−σ* transition of Br 2.…”

“…Thus, Figure 3 a shows the expected infrared spectrum for phosgene synthesis under conditions of partial CO conversion. 3 …”

“…Donau Supersorbon K40 activated carbon was used exclusively in this work and characterization details are presented elsewhere. 3 The reactor was charged typically with a catalyst (approximately 0.125 g) of size fraction 250–500 μm (Endcotts sieves). For activation, samples were dried overnight at 383 K in flowing dinitrogen (BOC, 99.998%) at a flow rate of 20 cm 3 min –1 .…”

“…The first paper described a series of laboratory procedures for analyzing candidate phosgene synthesis catalysts, including protocols adopted for the safe handling of this hazardous reaction system. 3 The second paper considered topics such as activation energy, reaction profile as a function of time-on-stream (T-o-S), and mass balance relationships. The work also determined the rate law for phosgene synthesis over this substrate.…”

Cl2 Adsorption and Desorption over Ordered Mesoporous Carbon Materials as an Indicator for Catalytic Phosgene Formation

“…Phosgene is produced on an industrial scale in multitubular reactors over activated carbon catalysts. Although the process of phosgene production [3,4], the kinetics of the reaction [5][6][7][8] and catalytic active commercial activated carbons for this reaction are well investigated [9][10][11], there are only a few mechanistic studies. Noteworthy are the studies by Lercher and co-workers, who propose an Eley-Rideal mechanism for the formation of phosgene [12][13][14].…”