氧改性活性炭负载Ru催化剂对乙炔氢氯化反应的影响

Ru Catalysts with Oxygenated Carbon Supports for Acetylene Hydrochlorination

催化剂的活性和载体性质关系很大,活性炭是一种最常见的催化剂载体。本文选取椰壳活性炭作为催化剂载体,经煅烧之后进行了氧化处理改性研究,实验考察了改性载体负载钌基活性组分在乙炔氢氯化反应中的应用,并利用比表面积测试法、拉曼光谱分析、化学吸脱附分析、X射线光电子能谱测试和热重分析等对其结构和表面形貌进行了表征。实验结果表明:不同温度煅烧处理对载体的氧含量和表面含氧官能团密切相关,改性后载体表面富含酸酐和羰基基团,制备的钌基催化剂,主要活性组分为Ru O2和Ru Ox,能减少催化剂表面的积碳含量;改性后最好的催化剂为Ru/C800-A5,在反应温度为180℃,乙炔空速为150 h-1时,乙炔初始转化率可以达到97%。上述实验方法与结果说明:这种对载体先煅烧后氧化的改性方法操作简单,容易实施;Ru/C800-A5是一种绿色、高效、价格低廉的催化剂,同时具有很好的工业化应用前景。

The activity of catalysts has the inseparable influence with support.The activated carbon is one of the most common catalyst support.This article choose the coconut shell activated carbon as a catalyst carrier,which modified through a calcination tandem acidic treatment,and the effect of the modified carbon supports on the catalytic performance of Ru-based catalysts was studied for acetylene hydrochlorination,using characterizations and surface morphology of BET,Raman,TPD-MS,TPR,XPS,and TGA.It is indicated that the oxygen content and the oxygen-containing functional groups on the carbon surfaces are associated greatly with the calcination temperature besides the subsequent acidic treatment.For the Ru-based catalysts,the modified carbon supports enriched with anhydride and the carbonyl groups can facilitate the formation of catalytic active species of Ru O2 and Ru Ox,but also retard the coking deposition on catalyst surface.The optimal catalytic activity was achieved over Ru/C800-A5,with the acetylene conversion of 97% under the conditions of 180 ℃ and C2H2 GHSV of 150 h-1.This modified through a calcinations tandem acidic treatment is easy to implement.And that activity component Ru is very cheaper,the Ru/C800-A5 catalyst is a green,efficient,low price and has the prospect of industrialization.