在用氨修改的Ag/NZ5上增强微量乙烯的吸附:层次结构和金属分散效应
Ying Qi1, Huaming Yang1, Chunli Li1
1National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China.
Molecules (Basel, Switzerland)
|March 13, 2024
概括
新的带有银的化物吸附剂有效地去除了微量乙烯,这是一种导致农产品过度成熟的气体. 这一创新延长了产品的保质期,并减少了食品浪费.
科学领域:
- 材料科学 材料科学 材料科学
- 农业科学 农业科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 微量乙烯气在储存和运输过程中加速农产品的成熟和变质.
- 乙烯的去除对于延长保质期和尽量减少收获后损失至关重要.
- 采酸支持的银吸附剂为高效的乙烯吸附提供了一个有前途的解决方案.
研究的目的:
- 开发和表征由氨修饰的等级性的含银的焦化物吸附剂 (Ag/NZ5(X)).
- 评估已制备的吸附剂的乙烯吸附能力和有效性.
- 阐明影响吸附剂性能的结构和化学变化.
主要方法:
- 使用不同的氨处理时间合成了分层的Ag/NZ5(X) 吸附剂.
- 乙烯吸附能力在室温下测量.
- 吸附剂的结构和特性被分析使用技术,如 (提及具体的技术,如果在抽象中可用,否则概括).
- 描述包括评估结构变化,活跃地点的可访问性和银 dispersion.
主要成果:
- 氨基修饰导致了层次化的热结构,增强了乙烯吸附.
- Ag/NZ5(2.5) 吸附剂显示出最高的吸附能力和几乎完全的乙烯去除.
- 修改后的热石表现出较低的扩散阻力和更好的活性部位可访问性.
- 脱水效应导致缺陷性增加,银支相互作用更强,银分散率更高.
结论:
- 通过氨处理等级式的化物修饰显著改善了乙烯吸附.
- 开发的Ag/NZ5(2.5) 吸附剂在室温下对微量乙烯的去除非常有效.
- 这些发现有助于减少农业食品浪费和延长产品的保质期.
相关概念视频
00:53Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
1.9K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
1.9K
01:19Diazonium Group Substitution: –OH and –H
2.8K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
2.8K
01:33Carboxylic Acids to Methylesters: Alkylation using Diazomethane
2.2K
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.
2.2K
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.1K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.1K
01:25Basicity of Heterocyclic Aromatic Amines
6.0K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.0K