在气相二甲基乙烯碳化过程中提高了催化性能,相对于易于NH4F蚀刻的费里里亚石
Dexin Zhang1,2,3, Kang Li2, Junli Chen1
1College of Chemical Engineering and Environment, China University of Petroleum Beijing 102249 China 2565874326@qq.com cysun@cup.edu.cn.
使用NH4F蚀刻创建了层次化的ZSM-35化石,增强了二甲基乙烯碳化酶的催化活性. 适度的蚀刻保持了结构和酸度,而严重的蚀刻由于焦炭沉积而降低了性能.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 甲基乙 (DME) 到甲基 (MA) 的碳化是从合成气中生产乙醇的关键途径.
- 费里里石 (ZSM-35) 热质提供稳定性,但需要增强该反应的活性.
- 传统的后处理方法往往会损害热带石的完整性.
研究的目的:
- 开发ZSM-35的后处理方法,以改善DME碳化的催化活性.
- 在保持结构完整的同时,创建具有增强孔隙可访问性的层次ZSM-35.
- 调查NH4F蚀刻对ZSM-35物理化学性能和催化性能的影响.
主要方法:
- 通过NH4F蚀刻准备等级ZSM-35.
- 使用XRD,XRF,FESEM,HRTEM,N2吸附-脱附,NH3-TPD,Py-IR,27Al MAS NMR和29Si MAS NMR进行了表征.
- 评估气相DME碳化中的催化活性和稳定性.
主要成果:
- NH4F蚀刻创造了分层的孔系统,增强了对8-MR和10-MR通道的访问.
- 温和的蚀刻保存了热的结晶性,酸性和微孔结构,从而导致了优越的催化活性和稳定性.
- 严重的蚀刻破坏了框架,增加了缺陷,促进了焦炭沉积,并降低了催化性能.
结论:
- NH4F蚀刻是一种有效的方法,可以创建具有改善催化性能的等级ZSM-35.
- 控制的蚀刻条件对于平衡增强的毛孔体积和维护热带石完整性至关重要.
- 这种方法提供了一条简单的途径,以提高工业相关的化物,以改善催化应用.
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