摘要本文研究了环氧丙烷异构化反应中所使用的碱性磷酸锂催化剂的使用寿命， 积碳以及催化剂的再生。结果表明，碱性磷酸锂催化剂在参与反应 50 小时左右后 失活，催化剂失活是由于其表面覆盖积碳引起，表面覆盖的积碳可以用煅烧法、 通水蒸气法来除去，从而达到催化剂再生的目的。通过 IR、BET、TG 等研究方 法进行表征，发现失活后催化剂比表面及孔体积均下降，但催化剂晶型并未改变， 也无新的物相生成。TG 分析发现催化剂积碳分解温度在 300℃~500℃，为再生煅 烧温度提供依据。再生后的催化剂性能良好，与新鲜催化剂的催化活性相近。68555

毕业论文关键词：环氧丙烷 磷酸锂 使用寿命 积碳 再生

Study on the service life, regeneration and carbon deposits of basic lithium phosphate catalyst

Abstract

In this paper, the service life and regeneration of basic lithium phosphate catalyst used in the isomerization of propylene oxide were studied deeply. The results showed that the basic lithium phosphate catalyst get to deactivation after about 50 hours. The catalyst deactivation was due to carbon deposits covering the surface. Carbon deposits could be removed by water vapor for the regeneration of  the  catalyst. Calcination turned to be another way to refresh the catalyst. The catalyst was characterized using thermogravimetry and differential thermal analysis (TG), BET, IR and other research methods. Surface area and pore volume of the deactivated catalyst were decreased, without new phase formation. TG analysis showed that the decomposition temperature of the catalyst ranged from 300 oC to 500 oC, providing the basis for the calcination temperature. Conversion and selectivity of the catalyst after regeneration were good, with catalytic activity similar to fresh catalyst.

Keywords:  propylene  oxide,  lithium  phosphate,  service  life,  deactivation,    carbon deposition

目录

1前言 1

1.1环氧丙烷异构化反应制烯丙醇工艺 1

1.2催化剂的失活 1

1.3积碳方面探究 2

1.4催化剂的再生 3

1.5国内外研究进展 4

1.6本文的选题背景及主要内容 6

2.实验部分 7

2.1实验药品及仪器 8

2.1.1原料及试剂 8

2.1.2实验仪器 8

2.2实验步骤 9

2.2.1催化剂的制取 9

2.2.2催化剂的失活 9

2.2.3催化剂的再生 9

2.2.4催化剂的表征及积碳研究 11

2.3 实验结果与讨论 12

2.3.1催化剂的失活 12

2.3.2催化剂的再生结果分析 13

2.3.3催化剂的表征 15

实验结论 24

致谢 26

参考文献