Temperature programmed desorption of sorbates from zeolites. Part I. Constant coverage, variable heating rate method

Robin E. Richards; Lovat V.C. Rees

doi:10.1016/0144-2449(86)90006-0

Temperature programmed desorption of sorbates from zeolites. Part I. Constant coverage, variable heating rate method

Robin E. Richards, Lovat V.C. Rees

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Abstract

A new method of analysing temperature programmed desorption (t.p.d.) curves measured at different heating rates has been developed. The activation energy for desorption (E_d) and pre-exponential factor (A) have been evaluated at constant coverages by a minimization procedure for ethanol, n-hexane, n-octane, and p-xylene ZSM-5/silicalite-1 pairs. The t.p.d. curves were recorded on a conventional thermogravimetric balance interfaced to a microcomputer, which was used for both data collection and analysis. The E_d values compare favourably with published isoteric and calorimetric heats of adsorption. Advantages of this method are the rapidity of data collection and ease of analysis. The quantitative desorption information obtained could be of valuable assistance to catalyst screening for the characterization of sorbent-sorbate interaction, and in particular to the study of zeolitic acid sites by ammonia desorption.

Original language	English (US)
Pages (from-to)	17-25
Number of pages	9
Journal	Zeolites
Volume	6
Issue number	1
DOIs	https://doi.org/10.1016/0144-2449(86)90006-0
State	Published - Jan 1986

Keywords

Temperature programmed desorption
ZSM-5
ethanol
hydrocarbons
silicalite

ASJC Scopus subject areas

General Environmental Science

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10.1016/0144-2449(86)90006-0

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title = "Temperature programmed desorption of sorbates from zeolites. Part I. Constant coverage, variable heating rate method",

abstract = "A new method of analysing temperature programmed desorption (t.p.d.) curves measured at different heating rates has been developed. The activation energy for desorption (Ed) and pre-exponential factor (A) have been evaluated at constant coverages by a minimization procedure for ethanol, n-hexane, n-octane, and p-xylene ZSM-5/silicalite-1 pairs. The t.p.d. curves were recorded on a conventional thermogravimetric balance interfaced to a microcomputer, which was used for both data collection and analysis. The Ed values compare favourably with published isoteric and calorimetric heats of adsorption. Advantages of this method are the rapidity of data collection and ease of analysis. The quantitative desorption information obtained could be of valuable assistance to catalyst screening for the characterization of sorbent-sorbate interaction, and in particular to the study of zeolitic acid sites by ammonia desorption.",

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year = "1986",

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T1 - Temperature programmed desorption of sorbates from zeolites. Part I. Constant coverage, variable heating rate method

AU - Richards, Robin E.

AU - Rees, Lovat V.C.

PY - 1986/1

Y1 - 1986/1

N2 - A new method of analysing temperature programmed desorption (t.p.d.) curves measured at different heating rates has been developed. The activation energy for desorption (Ed) and pre-exponential factor (A) have been evaluated at constant coverages by a minimization procedure for ethanol, n-hexane, n-octane, and p-xylene ZSM-5/silicalite-1 pairs. The t.p.d. curves were recorded on a conventional thermogravimetric balance interfaced to a microcomputer, which was used for both data collection and analysis. The Ed values compare favourably with published isoteric and calorimetric heats of adsorption. Advantages of this method are the rapidity of data collection and ease of analysis. The quantitative desorption information obtained could be of valuable assistance to catalyst screening for the characterization of sorbent-sorbate interaction, and in particular to the study of zeolitic acid sites by ammonia desorption.

AB - A new method of analysing temperature programmed desorption (t.p.d.) curves measured at different heating rates has been developed. The activation energy for desorption (Ed) and pre-exponential factor (A) have been evaluated at constant coverages by a minimization procedure for ethanol, n-hexane, n-octane, and p-xylene ZSM-5/silicalite-1 pairs. The t.p.d. curves were recorded on a conventional thermogravimetric balance interfaced to a microcomputer, which was used for both data collection and analysis. The Ed values compare favourably with published isoteric and calorimetric heats of adsorption. Advantages of this method are the rapidity of data collection and ease of analysis. The quantitative desorption information obtained could be of valuable assistance to catalyst screening for the characterization of sorbent-sorbate interaction, and in particular to the study of zeolitic acid sites by ammonia desorption.

KW - Temperature programmed desorption

KW - ZSM-5

KW - ethanol

KW - hydrocarbons

KW - silicalite

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Temperature programmed desorption of sorbates from zeolites. Part I. Constant coverage, variable heating rate method

Abstract

Keywords

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