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Titolo:
The influence of covariances during laboratory evaluation of FCC catalysts
Autore:
Rawet, R; Cerqueira, HS; Pinto, JC;
Indirizzi:
CENPES, PETrOBRAS, Div Tecnol Proc & Catalisacdores, BR-21949900 Rio De Janeiro, Brazil CENPES Rio De Janeiro Brazil BR-21949900 BC949900 Rio De Janeiro, Brazil Fed Univ Rio De Janeiro, COPPE, Programa Engn Quim, BR-21945970 Rio De Janeiro, Brazil Fed Univ Rio De Janeiro Rio De Janeiro Brazil BR-21945970 BCeiro, Brazil
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 1-2, volume: 207, anno: 2001,
pagine: 199 - 209
SICI:
0926-860X(20010201)207:1-2<199:TIOCDL>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARAMETER-ESTIMATION; THERMODYNAMIC MODELS; KINETIC-MODELS; GAS-OIL; CRACKING; COKE; DISCRIMINATION;
Keywords:
FCC catalyst; evaluation; covariance; experimental errors; confidence interval; catalytic cracking; parameter estimation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Rawet, R CENPES, PETrOBRAS, Div Tecnol Proc & Catalisacdores, Ilha Fundao,Quadra 7,BR-21949900 Rio De Janeiro, Brazil CENPES Ilha Fundao,Quadra 7 RioDe Janeiro Brazil BR-21949900 BC
Citazione:
R. Rawet et al., "The influence of covariances during laboratory evaluation of FCC catalysts", APP CATAL A, 207(1-2), 2001, pp. 199-209

Abstract

One problem of practical interest is the evaluation of catalyst activity and selectivity of commercial fluid catalytic cracking (FCC) catalysts. Although different statistical methods may be used for this purpose, these methods are usually neglected or oversimplified in catalysis. In a previous study [1], it was shown that experimental errors of independent Variables may exert a significant impact upon the discrimination of catalyst performance in FCC processes and should not be disregarded. In this work it is shown that actual experimental measurements can present strong correlation and thatthe existence of covariance among experimental measurements can also influence the catalyst discrimination procedure. The influence of covariance among variables on parameter estimation and on the confidence interval (CI) ofpredicted values is discussed. It is shown that considering the covariances may have either a positive or a negative effect on the CI for predicted values. Practical examples regarding the microactivity test (MAT) of FCC catalyst characterization are used to illustrate the discussion, although the conclusions can be extended to systems other than catalytic cracking. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 22:25:16