Browsing Journal Articles by Author "O'Connor, C"

Now showing items 1-8 of 8

Aromatization of 1-hexene and 1-octene by gallium/H-ZSM-5 catalysts.

Author: Nash, R ; Dry, M ; O'Connor, C Date: 1996 Gallium/H-ZSM-5 zeolite catalysts were tested for the aromatization of long-chain alkenes, namely 1-hexene and 1-octene. Aromatic yields of ca. 70% were obtained, which are similar to those reported in the literature for propene aromatization. ... Read more c b n d
The characterization and elimination of the external acidity of ZSM-5.

Author: Weber, R ; Fletcher, J ; Möller, K ; O'Connor, C Date: 1996 The external acidity of ZSM-5 was modified either by coating the crystals with a silicalite shell or by chemical vapour deposition (CVD) of tetraethoxysilane (TEOS). Temperature programmed desorption (TPD) techniques were used to characterize ... Read more c b n d
The chemical vapour and liquid deposition of tetraethoxysilane on the external surface of ZSM-5

Author: Weber, R W ; Möller, K P ; Unger, M ; O'Connor, C Date: 1998 The external acidity of ZSM-5 was modified by chemical vapour deposition (CVD) and chemical liquid deposition (CLD) of tetraethoxysilane [Si(OC2 H5 ) 4 ] using a static vacuum system, a vapour phase flow system and liquid phase deposition. ... Read more c b n d
Effect of catalyst modification on the conversion of methanol to light olefins over SAPO-34.

Author: van Niekerk, M ; Fletcher, J ; O'Connor, C Date: 1996 The catalytic activity and selectivity of as-prepared and modified samples of SAPO-34 and Me-APSO-34 (Me = Co, Ni) for the conversion of methanol to olefins has been investigated. The catalytic performance for the conversion of methanol to ... Read more c b n d
Effects of in-situ chemical vapour deposition using tetraethoxysilane on the catalytic and sorption properties of ZSM-5.

Author: Röger, H ; Krämer, M ; Möller, K ; O'Connor, C Date: 1998 The external surface of HZSM-5 crystals was gradually modified by in-situ CVD of tetraethoxysilane. Using the particular procedures described in the paper, it was shown from probe reactions in combination with sorption studies that the external ... Read more c b n d
High-pressure oligomerization of propene over heteropoly acids

Author: Vaughan, J ; O'Connor, C ; Fletcher, J Date: 1994 Ammonium, potassium, nickel, copper, cobalt, iron, cerium, and aluminium salts of 12-tungstophosphoric acid (HPW) as well as the ammonium and aluminium salts of 12-tungstosilicic acid have been synthesized and characterized by TG-DTA, nitrogen ... Read more c b n d
Influence of preparation variables on the dispersion of platinum on zeolite KL.

Author: M'Kombe, C ; Dry, M ; O'Connor, C Date: 1997 Various preparation conditions were investigated to evaluate their effect on the dispersion of Pt on zeolite KL. The highest dispersion was obtained by calcining in O2 at about 350 °C. Calcining in N2 or H2 resulted in lower dispersions. ... Read more c b n d
Use of TPR/TPO for characterization of supported cobalt catalysts.

Author: Sewell, G ; van Steen, E ; O'Connor, C Date: 1996 The extent of reduction of supported cobalt catalysts is difficult to determine using TPR due to the unknown stoichiometry of reduction and due to the dynamic nature of the measurement. A method is described where, by using a combined TPR/TPO ... Read more