Citation: Dhanapalan Karthikeyan, Raji Atchudan, Raji Sivakumar. Effect of metal content on the activity and product selectivity of n-decane hydroisomerization over Ni-Pd/HY zeolite[J]. Chinese Journal of Catalysis, ;2016, 37(11): 1907-1917. doi: 10.1016/S1872-2067(16)62507-X shu

Effect of metal content on the activity and product selectivity of n-decane hydroisomerization over Ni-Pd/HY zeolite

a Department of Chemistry, Arignar Anna College of Arts and Science, Krishnagiri-635001, Tamilnadu, India;
b School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea;
c Department of Chemistry, Anna University, Guindy Campus, Chennai-600025, India

Received Date: 18 May 2016
Revised Date: 9 July 2016

Metal-loaded zeolite catalysts were synthesized and examined in the hydroisomerization of n-decane. Specifically, zeolite Y was impregnated with 0.1 wt% Pd and varying amounts of Ni (0.1-0.5 wt%). The crystallinity of the metal-loaded catalysts was characterized by X-ray diffraction, and the average metal particle size was determined by transmission electron microscopy. The states of Pd and Ni were identified by X-ray photoelectron spectroscopy. Ammonia tempera-ture-programmed desorption analysis revealed the occurrence of ion-exchange of some of the cata-lyst acid sites with Ni²⁺. The reducibility of the HY zeolite-supported Pd, Ni, and Pd-Ni catalysts was studied by temperature-programmed reduction. The hydroisomerization of n-decane over the pre-pared catalyst was conducted at 200-450℃ under 1 atm. Ni addition of up to 0.3 wt% over 0.1 wt% Pd/HY enhanced the n-decane conversion and isomerization product selectivity. The improved selectivity of the mono-and dibranched isomers suggested the occurrence of a protonated cyclo-propane intermediate mechanism. However, further Ni addition above 0.3 wt% considerably re-duced the activity and isomerization selectivity. The bimetallic catalysts were more selective toward the formation of dibranched isomers, i.e., those containing a higher octane number.
- Hydroisomerization,
- n-Decane,
- Zeolite Y,
- Palladium,
- Impregnation method
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