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Title n-HEPTANE HYDROISOMERIZATION OVER BIFUNCTIONAL ZEOLITE CATALYSTS
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Publication Date
Degree Level doctoral
University/Publisher University of Manchester
Abstract Isomerization is an industrially important process which involves converting less desirable n-alkanes into more desirable iso-alkanes. Increased iso-alkanes are preferred in gasoline to increase the octane number and to help meet the demand for more efficient automotive engines. Bifunctional catalysts containing noble metals such as Pt on USY zeolites has been widely used in the petroleum refining for the isomerization process.This research was carried out to study the n-heptane hydroisomerization over bifunctional monometallic (Ni or Pt) and bimetallic (Pt-Ni) catalysts supported on a commercial CBV-712 zeolite. Catalysts were prepared by ion exchange and competitive ion exchange in order to determine any positive catalytic effect of Pt and Ni over 1% Pt-USY. Five metal-loaded CBV-712 USY zeolite catalysts, with varying levels of both metals (Pt and Ni), were first characterized with ICP-OES, XRD, SEM and TEM. After in-situ activation, all catalysts were tested for the hydroisomerization of n-heptane co-fed with hydrogen. The liquid and gas products were analyzed using GC-FID and GC-MS, and the coke content on the catalyst was determined using TGA.For short times-on-stream, the Pt-Ni catalysts were more active than the Pt catalysts as described in the literature. However, the bi-metallic catalysts deactivated to different degrees dependent on the method of ion exchange used.In addition, the results tended to indicate that after longer periods-on-stream, the bimetallic tended to behave similar to the 1 wt% Pt only. However, the 1 wt% Pt 2 wt% Ni remained more active and appeared stable even up to 6000 minutes-on-stream. This is the first time these results are reported in the literature. Another finding in this dissertation indicates the control of pH throughout the ion exchange procedure is essential as the resultant metal cluster size impacts on the catalytic performance and stability.
Subjects/Keywords n-Heptane, Hydroisomerization, Bifunctional, Zeolite Catalysts, Metal Loading, Pt, Ni
Contributors PRITCHARD, ROBIN RG; Pritchard, Robin; Garforth, Arthur
Language en
Country of Publication uk
Format 138 page(s)
Record ID oai:escholar.manchester.ac.uk:uk-ac-man-scw-150415
Repository manchester
Date Retrieved
Date Indexed 2019-01-09

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…containing noble metals such as Pt on USY zeolites has been widely used in the petroleum refining for the isomerization process. This research was carried out to study the n-heptane hydroisomerization over bifunctional monometallic (Ni or Pt) and…

…USY zeolite catalysts, with varying levels of both metals (Pt and Ni), were first characterized with ICP-OES, XRD, SEM and TEM. After in-situ activation, all catalysts were tested for the hydroisomerization of n-heptane co-fed with hydrogen…

…Hydroisomerization of n-C7 over catalysts prepared during this dissertation namely Pt USY and Pt/Ni USY. 20 n-Heptane Hydroisomerization over Bifunctional Zeolite Catalysts CHAPTER TWO LITERATURE REVIEW 2.1. Introduction to Zeolites Zeolites are microporous…

…isomerization [8, 46]. In this dissertation Ni will be introduced as a second metal following in from work by Vazquez et al, who studied n-heptane isomerization and cracking over Ni-Mo/H-Y [47]. According to the literature, the behavior of…

…Pt USY and Pt/Ni USY was carried out during this program. 37 n-Heptane Hydroisomerization over Bifunctional Zeolite Catalysts CHAPTER THREE EXPERIMENTAL AND CHARACTERIZATION TECHNIQUES 3.1. Materials The following is a list of material used in…

n-Heptane Hydroisomerization over Bifunctional Zeolite Catalysts Figure 4-1: XRD pattern of the in-house synthesized, commercial NaY and typical zeolite Y sample................................................................................. 66…

…76 Figure 4-10: TEM images for Pt loading catalyst (B).................................... 78 Figure 4-11: TEM images for Pt-Ni loading catalyst (D)............................. 78 Figure 4-12: TEM images for Pt-Ni loading…

…reaction)................................................... 8 84 n-Heptane Hydroisomerization over Bifunctional Zeolite Catalysts Figure 4-16: Conversion (wt%) vs. time-on-stream (min) for reactions over B, D, E and F…

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