在纳米大小的ZSM-5上进行液相烯异构
Peixi Feng1, Chenglin Kang1, Xin Yue1
1Research Institute of Petroleum Processing, SINOPEC Beijing 100083 PR China kangcl.ripp@sinopec.com.
RSC advances
|June 18, 2024
概括
用酸盐-1种子合成的纳米-ZSM-5热,克服了扩散限制,以实现高效的液相二烯异体化. 优化合成产生的催化性能优于传统的热石.
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:
- 液相烯异构化是节能的,但由于常规ZSM-5热石的扩散限制而受到阻碍.
- 开发先进的酸盐催化剂对于提高烯异构化效率至关重要.
研究的目的:
- 合成纳米-ZSM-5热石,具有用于液相二烯异构的增强性质.
- 研究合成参数的影响,特别是OH-/SiO2摩尔比率,对石形态和性能的影响.
- 评估合成的纳米-ZSM-5的催化活性与传统的热石相比.
主要方法:
- 纳米-ZSM-5化物合成使用四烯氧化 (TPAOH) 和-1 (S-1) 种子.
- 描述技术包括X射线衍射 (XRD),扫描电子显微镜 (SEM),传输电子显微镜 (TEM) 和N2物理吸收.
- 优化OH-/SiO2摩尔比率以控制结晶体大小和聚合.
主要成果:
- 酸盐-1种子促进了ZSM-5晶体的形成,颗粒大小约为20纳米.
- OH-/SiO2 摩尔比率极大地影响了晶体的聚合和表面特性.
- 将比率优化为0.2的结果是纳米-ZSM-5具有高特异面积 (420 m2 g-1) 和中等孔体积 (0.57 cm3 g-1).
结论:
- 在优化条件下合成的纳米-ZSM-5热,有效地减轻了扩散障碍.
- 与传统的ZSM-5相比,开发的纳米泽奥利特在液相烯异构化中表现出优异的催化性能.
- 这项研究提出了一个有前途的策略,用于设计用于异构化反应的先进的酸盐催化剂.
相关概念视频
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
4.5K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.5K
Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control
2.6K
The addition of a hydrogen halide to 1,3-butadiene gives a mixture of 1,2- and 1,4-adducts. Since more substituted alkenes are more stable, the 1,4-adduct is expected to be the major product. However, the product distribution is strongly influenced by temperature; low temperature favors the 1,2-adduct, whereas the 1,4-adduct is predominant at high temperature.
2.6K
Ziegler–Natta Chain-Growth Polymerization: Overview
3.3K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.3K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.7K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.1K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.1K
Carboxylic Acids to Methylesters: Alkylation using Diazomethane
2.1K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.1K


