关于MoO-Pd/Ce-MCM-48催化剂的制剂和n-heptane异构化性能的研究
Yanhong Cui1,2, Xiuli Dong1, Zhen Jiang1
1College of Chemistry and Chemical Engineering, Northeast Petroleum University Daqing 163318 China 422536337@qq.com.
RSC advances
|January 31, 2024
概括
这项研究开发了一种新的Ce-MCM-48催化剂,用于n-heptane异构化. 优化的2%MoO-Pd/Ce-M催化剂实现了高转化率和选择性,用于生产分支异胺异构体.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 碳化合物加工对于燃料生产至关重要.
- 催化剂的开发是提高异构化效率的关键.
- 半孔材料为催化应用提供了独特的特性.
研究的目的:
- 为了合成和描述Ce-MCM-48分子.
- 准备和评估MoO-Pd/Ce-M催化剂用于n-heptane异构化.
- 为了研究氧化对催化剂性能的影响.
主要方法:
- 用于Ce-MCM-48制剂的热水合成.
- 对MoO-Pd/Ce-M催化剂合成的浸方法.
- 使用XRD,N2吸附-脱落,SEM,TEM,NH3-TPD,Py-IR,FT-IR和ICP-MS进行表征.
- 在微型固定床反应堆中的性能评估.
主要成果:
- 合成的Ce-MCM-48表现出中等性,有序结构和增加的酸位.
- 2%的MoO-Pd/Ce-M催化剂实现了58.7%的转化,91.2%的选择性和53.5%的n-heptane水分异构化产量.
- 优化条件 (400°C降解,300°C反应,7.6小时-1 WHSV) 有利于多分支的异丹生产.
- 氧化的添加增强了n-heptane异构化性能.
结论:
- Ce-MCM-48是开发高效异构化催化剂的合适支持.
- 这种MoO-Pd/Ce-M催化剂显示出产生高价值分支异丹的巨大潜力.
- 优化催化剂成分和反应条件对于最大限度地提高产量和选择性至关重要.
相关概念视频
03:00Preparation of Epoxides
7.7K
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of...
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of...
7.7K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.3K
01:22Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction
1.9K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
1.9K
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.0K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.0K
01:16Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.6K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.6K
02:24Reduction 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