An activated carbon (AC) supported hexamethylenetetramine (HMT), with a single tertiary amine N active site, was proposed to be used as a novel metal-free catalyst for acetylene hydrochlorination reaction. The 25% HMT/AC catalyst provided acetylene conversion of ~60% and C₂H₃Cl selectivity above 99% at 220 °C with a gas hourly space velocity (GHSV) of 30 h⁻¹. X-ray photoelectron spectra suggested the tertiary amine nitrogen was the only N species in the catalysts. Theoretical calculations and experimental studies showed that HCl is adsorbed by HMT preferentially. The insertion of acetylene into ClH bond of HCl is the key step.

中文翻译：

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六亚甲基四胺作为单一活性中心无金属催化剂的乙炔盐酸盐化机理探索

提议使用具有单个叔胺N活性位的活性炭（AC）负载的六亚甲基四胺（HMT）作为乙炔氢氯化反应的新型无金属催化剂。25％的HMT / AC催化剂在220°C和30 h ^-1的气体时空速（GHSV）下，乙炔转化率约为60％，C ₂ H ₃ Cl选择性高于99％。X射线光电子能谱表明，叔胺氮是催化剂中仅有的N种。理论计算和实验研究表明，HMT优先吸附HCl。关键步骤是将乙炔插入HCl的Cl H键中。