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相关概念视频

Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes

6.2K
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
6.2K
Physical Properties of Alkanes02:33

Physical Properties of Alkanes

10.8K
Alkanes are nonpolar molecules due to the presence of only carbon and hydrogen atoms. The electronegativity difference between carbon and hydrogen is minimal, and hence alkanes have a zero dipole moment. This leads to the presence of only dispersion forces between the molecules. The strength of dispersion forces is dependent on the surface area of the molecules on which they act. Since the surface area increases with the molecular length for straight-chain alkanes, the dispersion forces also...
10.8K
Relative Stabilities of Alkenes01:59

Relative Stabilities of Alkenes

13.8K
The relative stability of alkenes can be determined by comparing their heats of hydrogenation. The lower heat of hydrogenation indicates the more stable alkene.  The three main factors determining the relative stability of alkenes are i) the number of substituents attached to the double-bond carbon atoms, ii) hyperconjugation, and iii) the stereochemistry of the double bond.
13.8K
Constitutional Isomers of Alkanes02:18

Constitutional Isomers of Alkanes

17.6K
Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as constitutional isomerism. Alkanes with four or more carbons showing multiple structures with the same molecular formula thereby exhibit constitutional isomerism.
The linear isomer of an alkane is prefixed by the term “n”; hence a linear isomer of pentane is known as n-pentane. Based on the type of branching, some of the...
17.6K
Mass Spectrometry: Long-Chain Alkane Fragmentation01:18

Mass Spectrometry: Long-Chain Alkane Fragmentation

1.5K
The molecular ions of linear alkanes prefer to fragment at the carbon-carbon bond away from the end of the chain since the cleavage of an inner bond creates a stable carbocation and a stable radical. Consequently, the mass signals of linear alkanes feature intense peaks in the middle of the mass-to-charge ratio plot with weaker peaks on either end. The fragmentation of each carbon-carbon bond with the release of a methyl group in each splitting leads to prominent peaks in the mass spectra...
1.5K
Nomenclature of Alkanes02:22

Nomenclature of Alkanes

21.4K
In the late 19th-century, the number of new chemical compounds discovered increased tremendously. Hence, the necessity arose to develop a naming system for the systematic nomenclature of these newly discovered compounds. IUPAC (International Union for Pure and Applied Chemistry), established in 1919, sets rules for the nomenclature.
The alkane nomenclature considers the length of the carbon chain, the number, and the location of the substituent to arrive at its systematic name. The IUPAC...
21.4K

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A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
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使用线性回归计算长链基的计算:应用到水分异构化.

Shrinjay Sharma1, Richard Baur2, Marcello Rigutto2

  • 1Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical Engineering, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands.

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概括
此摘要是机器生成的。

这项研究使用新的线性回归模型准确计算了类 entropies. 这些发现提供了关于优化以热酸催化化过程以获得更清洁的能源的见解.

关键词:
这些基是基.进入的过程中,化异化是指水分异化.线性回归是一种线性回归.

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科学领域:

  • 化学热力学化学热力学
  • 催化剂是一种催化剂.
  • 计算化学是一种计算化学.

背景情况:

  • 精确的热化学特性对于化学过程设计至关重要.
  • 目前用于计算 entropies 的现有方法对较长的链有局限性.
  • 酸催化水分异构化是一个重要的工业过程.

研究的目的:

  • 使用一种新的线性回归模型计算比C10长的同体的 entropies.
  • 为了研究热生产和热量输入在热催化化化过程中.
  • 评估链条长度和温度对这些特性的影响.

主要方法:

  • 开发并应用了一种基于二阶组贡献的热化学性质线性回归模型.
  • 计算了产量和热量输入,用于在500K时在各种化物中C7异构体的化.
  • 研究了链条长度 (C7-C14) 和温度对MTW型地石中水分异构化的影响.

主要成果:

  • 计算的基 entropies 显示出与实验数据的良好一致,并建立了相关性.
  • 的产生和热量输入在不同的热带岩结构中略有差异.
  • 热量输入和产量都随着更长的链和更高的温度而增加.

结论:

  • 线性回归模型为基提供了准确的值计算.
  • 这些发现为优化酸盐催化异构化过程提供了宝贵的见解.
  • 了解热化学性质是设计高效的催化系统的关键.