Catalyst Preparation Techniques

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What is the advantage of using the dry or pore volume impregnation method?

Allows for deposition of quantities exceeding the number of adsorption sites on the surface.

What may occur if the number of species that can adsorb on the surface is smaller during dry impregnation?

Chromatographic effect may occur, i.e., attachment to the mouth of the pores.

How does incipient wetness impregnation differ from dry impregnation?

Volume of the solution is more empirically determined to correspond to that beyond which the catalyst begins to look wet.

Describe the process of deposition by selective reaction with the surface of the support.

Carrier is left in contact with an excess of solution for a definite time, then excess liquid is removed using a dipping technique. Signup and view all the answers

What type of interactions work best with the method of incipient wetness impregnation?

Ion/solid interactions Signup and view all the answers

What is a key characteristic of dry or pore volume impregnation?

Deposition of quantities exceeding adsorption sites on the surface Signup and view all the answers

What is a potential consequence of species adsorption on the surface during dry or pore volume impregnation?

Chromatographic effect at the mouth of the pores Signup and view all the answers

Which impregnation method involves introducing components in the volume corresponding to the pore volume of the support?

Dry or pore volume impregnation Signup and view all the answers

What is a distinctive feature of deposition by selective reaction with the surface of the support?

A strong bond with the surface Signup and view all the answers

In which method is it important to control the distribution of species well?

Incipient wetness impregnation Signup and view all the answers

Which method is best suited for species that interact very weakly with the surface?

Dry or pore volume impregnation Signup and view all the answers

"Redistribution inside the pores is very slow" is a characteristic of which method?

Dry or pore volume impregnation Signup and view all the answers

What is an empirical consideration in incipient wetness impregnation compared to dry impregnation?

The volume of solution empirically determined beyond which catalyst looks wet. Signup and view all the answers

Catalyst Preparation Techniques

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Questions and Answers

What is the advantage of using the dry or pore volume impregnation method?

What may occur if the number of species that can adsorb on the surface is smaller during dry impregnation?

How does incipient wetness impregnation differ from dry impregnation?

Describe the process of deposition by selective reaction with the surface of the support.

What type of interactions work best with the method of incipient wetness impregnation?

What is a key characteristic of dry or pore volume impregnation?

What is a potential consequence of species adsorption on the surface during dry or pore volume impregnation?

Which impregnation method involves introducing components in the volume corresponding to the pore volume of the support?

What is a distinctive feature of deposition by selective reaction with the surface of the support?

In which method is it important to control the distribution of species well?

Which method is best suited for species that interact very weakly with the surface?

"Redistribution inside the pores is very slow" is a characteristic of which method?

What is an empirical consideration in incipient wetness impregnation compared to dry impregnation?

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