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Related Concept Videos

Leveling Effect01:29

Leveling Effect

738
In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the...
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Acid Strength and Molecular Structure03:05

Acid Strength and Molecular Structure

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Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with...
30.4K
Acidity of Carboxylic Acids01:21

Acidity of Carboxylic Acids

6.6K
Carboxylic acids are the strongest organic acids. However, their acidic strength is much less than mineral acids like HCl. Carboxylic acids ionize in water and readily lose the hydroxyl proton to form a resonance-stabilized carboxylate ion.
6.6K
Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

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The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
727
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

2.7K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
2.7K
Molecular Structure and Acidity02:34

Molecular Structure and Acidity

16.7K
An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
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External acidity as performance descriptor in polyolefin cracking using zeolite-based materials.

Sebastian Rejman1, Zoé M Reverdy1,2, Zeynep Bör1

  • 1Inorganic Chemistry and Catalysis, Institute for Sustainable and Circular Chemistry, Department of Chemistry, Utrecht University, Utrecht, The Netherlands.

Nature Communications
|March 27, 2025
PubMed
Summary
This summary is machine-generated.

Catalytic cracking of plastic waste is improved by focusing on external acid sites in zeolite Y catalysts, not bulk content. Reaction rates vary significantly with catalyst loading, requiring new models for bulky plastic conversion.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Catalysis

Background:

  • Plastic waste conversion via thermal pyrolysis faces challenges with high temperatures and low selectivity.
  • Catalytic cracking offers a potential solution by using catalysts to improve efficiency and reduce reaction temperatures.
  • Understanding catalyst structure-property relationships is crucial for developing effective materials for plastic cracking.

Purpose of the Study:

  • To investigate the structure-composition-performance relationships of zeolite Y catalysts for plastic cracking.
  • To determine the role of acid site location (bulk vs. external) in catalytic plastic conversion.
  • To re-evaluate established structure-property relationships for bulky molecules in microporous catalysts.

Main Methods:

  • Utilized ultrastable zeolite Y materials with varying acid site characteristics.
  • Performed catalytic cracking experiments on plastic waste (polyolefins).
  • Conducted detailed kinetic studies to analyze reaction rates and catalyst loading effects.

Main Results:

  • Plastic cracking activity correlated with external acid sites (surface and mesopores), not bulk Brønsted acidity.
  • Observed significant, material-dependent variations in reaction rate scaling with catalyst loading.
  • Identified limitations of existing models for predicting performance with bulky reactants.

Conclusions:

  • Catalyst design for plastic cracking should prioritize external acid site accessibility.
  • Kinetic behavior is highly sensitive to subtle catalyst material differences.
  • New structure-property paradigms are needed for efficient conversion of bulky plastics over microporous catalysts.