The effect of relatively low concentrations of Br_2(g) in the Cl_2(g) feedstock for phosgene synthesis catalysis via the reaction of CO_(g) and Cl_2(g) over activated carbon (Donau Supersorbon K40) is explored. Under the stated reaction conditions and in the absence of a catalyst, BrCl_(g) forms from the reaction of Cl_2(g) and Br_2(g). Phosgene synthesis over the catalyst at 323 K is investigated for Br_2(g):Cl_2(g) molar flow ratios in the range 0–1.52% (0–15,190 ppm) and shows enhanced rates of phosgene production. Maximum phosgene production is observed at a Br_2(g):Cl_2(g) molar flow ratio of 1.52% (15,190 ppm), which corresponds to an enhancement in the rate of phosgene production of ∼227% with respect to the phosgene flow rate observed in the absence of an incident bromine co-feed. A reaction model is proposed to account for the experimental observables, where BrCl_(g) is highlighted as a significant intermediate. Specifically, enhanced rates of phosgene production are associated with the dissociative adsorption of BrCl_(g) that indirectly increases the pool of Cl_(ad) available for reaction.

中文翻译：

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光气合成催化：氯进料流中少量溴的影响

探索了Cl _2（g）原料中相对较低的Br _2（g）浓度对通过活性炭（Donau Supersorbon K40）上的CO _（g）和Cl _2（g）反应进行光气合成催化的影响。下的规定的反应条件下并在没有催化剂存在下，氯化溴_（G）选自Cl的反应形式_2（G）和Br _2（克）。研究了在323 K下催化剂上的光气合成，其Br _2（g）：Cl _2（g）的摩尔比在0–1.52％（0–15,190 ppm）的范围内，显示出光气产生的速率提高。在Br _2（g）：Cl _2（g）处观察到最大的光气产生摩尔流量比为1.52％（15,190 ppm），相对于在无溴共进料的情况下观察到的光气流量，光气产生率提高了〜227％。提出了反应模型以说明实验可观察到的结果，其中BrCl _（g）被突出显示为重要的中间体。具体而言，光气产生速率的提高与BrCl _（g）的解离吸附有关，后者间接增加了可用于反应的Cl _（ad）库。