Effects of yttrium-doping on the performance of Cr2O3 catalysts for vapor phase fluorination of 1,1,2,3-tetrachloropropene
作者:Fang Wang、Jing-Lian Fan、Yang Zhao、Wen-Xia Zhang、Yan Liang、Ji-Qing Lu、Meng-Fei Luo、Yue-Juan Wang
DOI:10.1016/j.jfluchem.2014.07.030
日期:2014.10
The synthesis of 2-chloro-3,3,3-trifluoropropene (HCFC-1233xf) from 1,1,2,3-tetrachloropropene was performed over a series of Y2O3-Cr2O3(F) catalysts and the effect of yttrium-doping on the performance of Cr2O3 catalysts was investigated. Various characterization results showed that the addition of yttrium in the Cr2O3 led to the formation of high valent Cr species in the samples, which could be consequently
在一系列的Y进行2-氯-3,3,3-三氟丙烯(HCFC-1233xf的)的由1,1,2,3-四氯丙烯的合成2 ö 3 -Cr 2 ö 3(F)的催化剂和关于Cr的性能钇掺杂的效果2种ö 3催化剂进行了研究。各种表征结果表明,在将Cr添加钇的2 ö 3导致的样品中形成的高价铬物种,其可因此转化为催化活性的CrO X ˚F ý在预氟化过程物种。尽管在Cr 2 ö 3具有或不具有钇掺杂催化剂表现出在长期反应非常高的1,1,2,3-四氯丙烯转化,在添加钇中的Cr 2 ø 3有助于维持高选择性,以HCFC-1233xf的,具有最高的选择性(97%)在1摩尔%钇掺杂的铬得到2 ö 3后100小时的反应。上的废铬X射线光子光谱学结果2 ö 3(F)和1Y 2 ö 3 -Cr 2 ö 3(F)的催化剂表明活性的CrO的含量X ˚F ÿ反应70小时后,物种下降,这是造成选择性损失的原因(从97%降至88%),而用过的1Y