逆水气转移反应的Cu/CeO催化剂:制备方法的影响
Jieru Wang1,2,3,4, Chaoxian Wang1,2,3,4, Yongqiang Feng1,2,3,4
1School of Chemical Engineering, Northwest University Xi'an 710069 China zhaobr3636@126.com.
RSC advances
|May 24, 2024
概括
在等离子体中微燃烧的Cu/CeO2催化剂的化增强了CO2激活,用于逆水气转移反应. 由此产生的Cu-Ce固体溶液结构改善了二氧化碳吸附和催化性能.
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:
- 反向水气转移 (RWGS) 反应是二氧化碳利用的关键技术.
- 铜 (Cu) 和 (CeO2) 是RWGS催化剂的有效成分,原因是Cu的选择性和CeO2的氧空位丰富的表面用于CO2激活.
- 开发高效的Cu/CeO2催化剂对于推进RWGS技术至关重要.
研究的目的:
- 研究合成后化对通过等离子体诱导的微燃烧制备的Cu/CeO2催化剂的结构性质和催化性能的影响.
- 阐明催化剂结构,CO2激活和RWGS反应机制之间的关系.
- 为催化剂结构调制提供一种新的方法,以提高RWGS性能.
主要方法:
- 使用等离子体诱导的微燃烧制备Cu/CeO2催化剂.
- 对化温度对催化剂结构和性能的影响进行系统研究.
- 包括在现场扩散反射红外里埃变换光谱 (DRIFTS) 在内的表征技术.
- 在RWGS反应中对催化性能的评估.
主要成果:
- 血微燃烧在CeO2 (Cu/CeO2-mc) 上产生了高度分散的Cu物种.
- 化 (Cu/CeO2-mcc) 诱导了Cu-Ce固体溶液和CuO集群的形成,增加了氧气空缺.
- 与未化催化剂相比,Cu-Ce固体溶液结构显著改善了二氧化碳吸附和激活,导致RWGS催化性能优越.
- 在现场,DRIFTS表明形式途径占主导地位,Cu/CeO2-mcc上的双牙形式物种比Cu/CeO2-mc上的单牙形式物种更具反应性.
结论:
- 血微燃 Cu/CeO2 催化剂的化有效调节它们的结构,产生 Cu-Ce 固体溶液,增强氧气空缺.
- 在化催化剂 (Cu/CeO2-mcc) 上改善的二氧化碳吸附和激活,导致卓越的RWGS催化性能.
- 这项研究展示了催化剂结构工程的新方法,以优化CO2利用反应的性能,如RWGS.
相关概念视频
02:50Catalysis
26.9K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
26.9K
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.4K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.4K
02:15Preparation of Alcohols via Addition Reactions
6.2K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
6.2K
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
01:28Reduction 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
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K