Selective hydroisomerization of n-dodecane over platinum supported on zeolites

Abstract

In this study, in order to develop catalysts for the selective isomerization of higher paraffin, the hydroisomerization reaction of n-dodecane was performed as a model reaction. Pt/ZSM-48, Pt/HZSM-5, Pt/HY, and Pt/SAPO-11 were examined for the selective hydroisomerization of n-dodecane. The catalysts were characterized via X-ray powder diffraction, N 2 adsorption, and the temperature-programmed desorption of ammonia. Among the catalysts studied, the Pt/HZSM-48 catalyst exhibited the best isomerization selectivity in the hydroisomerization reaction of n-dodecane, which is attributed to the moderate acid sites and medium-sized pores present in the HZSM-48. The highest iso-dodecane yield was obtained at a reaction temperature of 280°C in the Pt/HZSM-48 catalyst. The optimal selectivity of the n-dodecane hydroisomerization over the Pt/SAPO-11 catalyst was obtained at approximately 300°C, which was slightly higher than that of the Pt/HZSM-48 catalyst.

Synthesis of ZSM-48 zeolites and their catalytic performance: a review

“…Yun et al 73 chose the n -dodecane hydroisomerization reaction as a model reaction to develop higher paraffin isomerization catalysts over Y, ZSM-5, ZSM-48 and SAPO-11. The Pt/HZSM-48 catalyst exhibits the best isomerization selectivity of all the catalysts, which is attributed to the moderate acid sites and medium-sized pores.…”

Catalytic upgrading of vegetable oils into jet fuels range hydrocarbons using heterogeneous catalysts: A review

“…Under constant conditions, a 0.2 wt.%Pt/H-ZSM-48 catalyst yields both n-dodecane conversion and isomers selectivity that were at least five times those obtained with 0.2 wt.%Pt/H-ZSM-5. Therefore, structural effects are critical during the hydroisomerization reaction[131].Hydrodeoxygenation (HDO) and hydrodecarboxylation (HDC) are the first steps for converting the vegetable oils into mostly n-alkanes suitable for upgrade to biojet fuels. Noble metals were the earlier catalysts to be tested and later replaced with other transition metals-based catalysts, due to many reasons including catalyst deactivation by poisoning, production of cracking species and process costs.…”

A Study of Pt-Mg/Mesoporous Aluminosilicate Catalysts for Synthesis of Jet-fuel from n-Octadecane

“…수첨업그레이딩 반응에서 수소화 /탈수소화 반응에는 백금과 팔라듐 등의 귀금속을 담지한 촉매가 Ni, Mo, Co 및 W과 같은 전이금속을 담지한 촉매보다 높은 활성을 보 인다 [11][12][13][14][15][16]. 탄소-탄소 결합의 분해 반응인 접촉분해 공정 및 골격 이성화 공정에는 제올라이트 촉매를 주로 사용한다 [9,[17][18][19][20][21][22][23][24][25]. 본 저 자들은 HY 제올라이트에 백금과 마그네슘이 담지된 촉매가 noctadecane의 수첨업그레이딩 반응에 효과적임을 보고한 바 있다 [26].…”