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Sandeep K. Saxena,Nagabhatla Viswanadham,M. O. GARG 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A series of BEA zeolite based catalysts have been prepared and characterized by XRD, SEM, surface area, porosity and acidity methods. The catalytic properties of BEA zeolite have been improved through steam assisted dealumination reaction to achieve improvement in crystallinity, surface area, pore volume, mesopores and decrease in total acidity along with increase in strong acidity (>100 kJ/mol) measured by heat of adsorption of ammonia. All these properties collectively contributed to the formation of branched paraffins, where, the sample BEA-2 obtained by steam treatment of BEA zeolite at 500 ℃ indeed exhibited promising catalytic activity in the production of branched paraffins (responsible for higher research octane number, RON, needed for gasoline applications) from n-heptane model compound and two industrial naphtha mixed hydrocarbon feedstocks. The isomer yields obtained on naphtha-1 and naphtha-2 feedstocks are 49.3 wt.% and 52.1 wt.% respectively. The results suggest that the catalyst is potential for octane boosting (16–39 units increase in RON) of industrial hydrocarbon feedstocks to produce aromatic-free, isoparaffins-rich gasoline blending stock suitable for fuel applications.
Sandeep K. Saxena,Nagabhatla Viswanadham,Ala’a H. Al-Muhtaseb 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Methanol value addition reaction has been studied on lab-synthesized nano-crystalline ZSM-5, Si/Al = 13 (NZ) possessing particle size of 29–51 nm and a micro-crystalline ZSM-5 (MZ) of similar atomic ratio is also taken as standard for comparison studies. The NZ sample exhibited excellent catalytic activity to produce 50.7 wt.% of high octane (Research Octane Number = 137) gasoline blending stock rich in desired toluene and xylene components, while the undesired benzene is very low, suitable for fuel applications. The superior performance of NZ to MZ catalyst reflected in three fold increase in gasoline yield and considerably high time-on-stream performance.
Octane number enhancement studies of naphtha over noble metal loaded zeolite catalysts
Nagabhatla Viswanadham,Sandeep K. Saxena,M.O. Garg 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
An Indian industrial naphtha containing mixture of various hydrocarbons belong to n-paraffins,isoparaffins, naphthenes and aromatics falling in C5 to C9 carbon range has been studied for its octane boosting through the production of isoparaffins over various Pt loaded zeolite catalysts possessing different acidity and porosity properties. Optimum balance of acid and metal functionalities in 0.6 wt.%Pt loaded on BEA zeolite helped in achieving highest increase in research octane number (RON) from 44to 80, suitable for gasoline applications, through the production of lower isoparaffins (iC4-iC6) along with C7+ isoparaffins.