表面酸度与MoO:AlO比率之间的关系在三元混合氧化物催化剂上,用于-2-的转化
Hani Zeidan1, Ebru Erünal2, Mustafa Esen Marti1
1Department of Chemical Engineering, Konya Technical University, Konya, Turkey.
Turkish journal of chemistry
|August 25, 2023
概括
含有Al2O3-MoO3-MgO和Al2O3-MoO3-WO3的第三级混合氧化物催化剂对生产具有100%的选择性. 由于更强的酸位,Al2O3-MoO3-WO3催化剂的活性更高.
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:
- 为选择性化学转化开发高效的催化剂至关重要.
- 三级混合氧化物为催化应用提供可调节的特性.
研究的目的:
- 为了合成和描述Al2O3-MoO3-MgO和Al2O3-MoO3-WO3催化剂.
- 研究MoO3:Al2O3比率对催化性能的影响.
- 了解这些混合氧化物系统中的结构-活性关系.
主要方法:
- 通过混合氧化物合成制备催化剂.
- -2-醇的气相转化为烯.
- 温度编程分析和X射线衍射 (XRD) 用于表征.
主要成果:
- 所有催化剂都实现了对的100%选择性.
- 由于较强的酸位,Al2O3-MoO3-WO3催化剂的活性高于Al2O3-MoO3-MgO催化剂.
- 催化剂转化产率与MoO3:Al2O3比率成正比.
- 在XRD分析中,含MgO的催化剂中发现了无形的MgMoO4和MgAl2O4相,在含WO3的催化剂中发现了Al2(WO4)3和WO3相.
结论:
- Al2O3-MoO3-WO3催化剂表现出优越的催化活性和酸度,这是由于WO3的存在.
- MoO3:Al2O3比率是影响转换产量的关键因素.
- 这些三元混合氧化物对选择性烯生产有前途.
相关概念视频
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.8K
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.
11.8K
Hydroboration-Oxidation of Alkenes
8.4K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
8.4K
Alkenes 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
Composition of Polyprotic Acid Solutions as a Function of pH
544
Polyprotic acids of the type H2M constitute two ionizable protons. As a result, on titration with a base, they exhibit two equivalence points in the titration curve. During titration, the species H2M, HM−, and M2− will be present in the solution at different points. The fractions of H2M, HM−, and M2− present at the various instances of the titration are denoted by α0, α1, and α2, respectively.
A graph with the alpha values is plotted against the volume of...
A graph with the alpha values is plotted against the volume of...
544
Oxymercuration-Reduction of Alkenes
7.6K
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
7.6K
Oxidation of Alcohols
13.3K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
13.3K


