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Original Experimental Approach for Assessing Transport Fuel Stability
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使用含有Fe和Cu的ZSM-5将乙部分氧化为氧化物
Michael M Forde1, Robert D Armstrong, Ceri Hammond
1Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building Park Place, Cardiff CF103AT, United Kingdom.
Journal of the American Chemical Society
|June 28, 2013
概括
铁和铜ZSM-5催化剂使用过氧化有效地将乙转化为氧化物. 这一过程实现了对酸的高选择性,并涉及复杂反应网络中的碳基.
科学领域:
- 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.
- 材料科学 材料科学 材料科学
背景情况:
- 石催化剂对于选择性碳化合物转化至关重要.
- 乙氧化是一个具有挑战性的过程,有可能产生有价值的氧化物.
- 过氧化为化学合成提供了一个更绿色的氧化剂.
研究的目的:
- 为了研究铁和铜ZSM-5催化剂对乙部分氧化的有效性.
- 阐明反应机制并确定关键中间体.
- 为了优化对含氧产品的高选择性条件.
主要方法:
- Fe/Cu-ZSM-5催化剂的合成和表征.
- 使用过氧化作为氧化剂的气相乙氧化.
- 使用气体染色学和质谱学分析反应产品.
- 机械学研究涉及同位素标记和激素捕获.
主要成果:
- 实现了高的组合氧化物选择性 (95.2%) 和生产率 (65mol/kgcat/h).
- 已证明高乙转化率 (56%),具有显著的酸选择性 (70%).
- 确定了一个复杂的反应网络,涉及C2氧化物,C1产物和乙烯形成.
- 经证实从乙直接生产乙醇,而不是通过乙基氧化物分解.
- 提供了一种涉及碳基激素的机制的证据.
结论:
- 铁/-ZSM-5催化剂对于乙部分氧化成氧化物非常有效.
- 反应通过由碳基激素启动的复杂网络进行.
- 这种催化系统为乙酸和乙醇生产提供了一个有前途的途径.
相关概念视频
Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
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.
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
Preparation of Epoxides
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 peroxy acids to...
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 peroxy acids to...
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
Carboxylic Acids to Methylesters: Alkylation using Diazomethane
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.
