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Related Concept Videos

Basicity of Aliphatic Amines01:21

Basicity of Aliphatic Amines

Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...

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Surface basicity on bulk modified phosphorus alumina through different synthesis methods.

Xinquan Wang1, Meiqing Shen, Liying Song

  • 1Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.

Physical Chemistry Chemical Physics : PCCP
|July 29, 2011
PubMed
Summary
This summary is machine-generated.

Phosphorus-modified alumina catalysts exhibit tunable surface basicity. The hydrolysis of phosphide aluminum (HPA) method enhances basicity by anchoring phosphorus within the alumina lattice, creating anion vacancies.

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Background:

  • Alumina (Al2O3) is a widely used catalyst support.
  • Modifying alumina's surface properties, such as basicity, can enhance its catalytic performance.
  • Phosphorus modification is a known strategy to alter the surface chemistry of alumina.

Purpose of the Study:

  • To investigate the effect of different phosphorus modification methods on the surface basicity of alumina.
  • To understand the relationship between phosphorus species location and surface basicity.
  • To explore the mechanism of enhanced basicity in phosphorus-modified alumina.

Main Methods:

  • Preparation of phosphorus-modified alumina samples using gel process (GPA) and hydrolysis of phosphide aluminum (HPA).
  • Comparison with gamma-Al2O3 impregnated by phosphate precursor (IPA).
  • Investigation of surface basicity using CO2 adsorption/desorption, in situ DRIFT, and temperature-programmed desorption (TPD).

Main Results:

  • Surface basicity of alumina can be effectively tuned by the location of phosphorus species.
  • In the GPA sample, phosphorus species were located in grain boundaries due to thermal instability.
  • In the HPA sample, phosphorus was stably anchored in the crystal lattice, leading to enhanced basicity.
  • The synthesis of HPA involved a valence change of phosphorus (P(-3) to P(+5)) and migration to cation sites.
  • Anion vacancies formed in the HPA lattice facilitated unsaturated oxygen ions, increasing basicity.

Conclusions:

  • The hydrolysis of phosphide aluminum (HPA) method is superior for enhancing alumina's surface basicity compared to GPA and IPA methods.
  • The stable anchoring of phosphorus within the alumina lattice and the formation of anion vacancies are key factors for increased basicity.
  • Understanding phosphorus speciation and location is crucial for designing advanced alumina-based catalysts.