Catalyst Characterization: Physical Techniques 17 10 2024

The point where the BET linear equation intercepts with the 1/W((P_0/P)-1) axis corresponds to

• inverse of the specific weight of the adsorbate

• inverse of a multiple of the adsorbate monolayer weight

• weight of the gas adsorbed

• liquid Nitrogen temperature

Which of the following pore sizes can be considered microporous ?

• <2mm

• >50 mm

• None of the pores is micrporous

• Both pores are microporous

Which of the following can be determined using Nitrogen physiosorption?

• porosity

• number of active sites

• particle size

• catalyst active metals

Pore size determination using mercury intrusion is based on

• Derby Scherer Equation

• Bragg's law

• Washburn Equation

• BET equation

Which of the following is used to bombard samples in Scanning electron Microscopy?

• X rays

• Laser

• Bombardment beams

• Electrons

Which of the following is true about micropores?

• They always reduce the total surface area

• They are the only pores in porous materials

• They can hinder diffusion in pores

• They are always more than macropores in any support

A particle statistical relationship between amount and size is known as

• Residual curve

• Particle size

• Particle size distribution

• Average particle size

Which of the following techniques should be recommended for identification of specie location?

• EDS

• SEM

• BET

• Sieve Analyses

Which of the following statements is correct about using nitrogen in surface area determination

• Nitrogen undergoes monolayer absorbed at Liquid nitrogen temperature

• Nitrogen is desorbed at liquid nitrogen temperature

• Nitrogen volume is used to determine surface area

• Nitrogen cross sectional area is used in determining the surface area.

The following are all considered physical properties of heterogenous catalysts with the exception of

• Surface Area

• Pore Volume

• Morphology

• Activity