...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Novel nonmetal catalyst of supported tetraphenylphosphonium bromide for acetylene hydrochlorination
【24h】

Novel nonmetal catalyst of supported tetraphenylphosphonium bromide for acetylene hydrochlorination

机译：支持的新型非金属催化剂对乙炔tetraphenylphosphonium溴氢氯化反应

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Tetraphenylphosphonium bromide (TPPB) ionic liquid-supported catalysts were synthesized and evaluated for the acetylene hydrochlorination reaction for the development of highly efficient nonmetal catalysts as substitutes for the currently used industrial mercuric catalyst in the production of vinyl chloride (VCM). The optimal 15% TPPB/SAC catalyst exhibited favorable catalytic activity and stability, with the highest acetylene conversion of 97.1% and the selectivity for VCM above 99.5% under the conditions of 220 degrees C, an acetylene gas hourly space velocity (GHSV) = 30 h(-1) and V-HCl/VC2H2 = 1.15. Characterized by TPD, FTIR, XPS, etc., TPPB exhibits strong adsorption toward HCl but very weak adsorption toward C2H2 and VCM; in particular, the adsorbed HCl can change the conformational structure of TPPB. DFT calculations suggest that over the active catalytic site of TPPB, the activation energy of acetylene hydrochlorination is 21.15 kcal mol(-1), which is much lower than that without catalyst (44.29 kcal mol(-1)). During the reaction, the H-Cl bond is preferentially activated through accepting the electrons transferred from the anion of TPPB, and then the C2H2 is activated to complete the addition reaction of H and Cl. Such unique preferential activation toward the H-Cl bond as well as the weak adsorption to the product VCM promotes the catalytic activity and the stability of the supported TPPB catalysts. The amount of carbon deposition on the 15% TPPB/SAC catalyst is as low as 2.99%, even after 300 h of reaction. The high activity and stability of the 15% TPPB/SAC catalyst indicate great promise for its application as a nonmetal catalyst for acetylene hydrochlorination.
机译：Tetraphenylphosphonium溴离子(TPPB)liquid-supported催化剂合成和对乙炔氢氯化反应评估开发高效的反应非金属催化剂作为替代品目前工业汞催化剂使用氯乙烯(VCM)的生产。最优15% TPPB /囊催化剂表现出有利的催化活性和稳定性的97.1%,乙炔转化率最高选择性的VCM下99.5%以上220摄氏度的条件下乙炔气体时空速(GHSV) = 30 h(1)和V-HCl / VC2H2 = 1.15。XPS等TPPB展品强烈吸附的方向HCl但很弱吸附对乙炔和VCM;特别是,吸附盐酸可以改变的TPPB的构象结构。计算表明,在活跃TPPB催化部位,激活的能量乙炔氢氯化反应是21.15千卡摩尔(1),它比这低得多催化剂(44.29千卡摩尔(1))。反应,氯键优先通过接受电子激活转移的阴离子TPPB,然后乙炔是激活完成添加反应H和Cl。债券以及激活的氯弱吸附产品VCM促进催化活性和稳定性支持TPPB催化剂。沉积在TPPB /囊催化剂低15%2.99%,即使300 h的反应。15%的活动和稳定TPPB /囊催化剂显示为其带来了福音应用程序作为乙炔的非金属催化剂氢氯化反应。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号