scholarly journals A direct method for analyzing the vertical vehicle–structure interaction

2012 ◽  
Vol 34 ◽  
pp. 414-420 ◽  
Author(s):  
S.G.M. Neves ◽  
A.F.M. Azevedo ◽  
R. Calçada
Keyword(s):  
Direct Method ◽  
Structure Interaction ◽  
Vehicle Structure ◽  
A Direct Method

scholarly journals A direct method for analyzing the nonlinear vehicle–structure interaction

2014 ◽  
Vol 69 ◽  
pp. 83-89 ◽  
Author(s):  
S.G.M. Neves ◽  
P.A. Montenegro ◽  
A.F.M. Azevedo ◽  
R. Calçada
Keyword(s):  
Direct Method ◽  
Structure Interaction ◽  
Vehicle Structure ◽  
A Direct Method

scholarly journals Plastic waste to fuels by hydrocracking at mild conditions

2021 ◽  
Vol 7 (17) ◽  
pp. eabf8283
Author(s):  
Sibao Liu ◽  
Pavel A. Kots ◽  
Brandon C. Vance ◽  
Andrew Danielson ◽  
Dionisios G. Vlachos
Keyword(s):  
Direct Method ◽  
Acid Sites ◽  
Liquid Fuels ◽  
High Yield ◽  
Tandem Catalysis ◽  
Hy Zeolite ◽  
Environmental Threat ◽  
Single Use ◽  
Initial Activation ◽  
A Direct Method

Single-use plastics impose an enormous environmental threat, but their recycling, especially of polyolefins, has been proven challenging. We report a direct method to selectively convert polyolefins to branched, liquid fuels including diesel, jet, and gasoline-range hydrocarbons, with high yield up to 85% over Pt/WO3/ZrO2 and HY zeolite in hydrogen at temperatures as low as 225°C. The process proceeds via tandem catalysis with initial activation of the polymer primarily over Pt, with subsequent cracking over the acid sites of WO3/ZrO2 and HY zeolite, isomerization over WO3/ZrO2 sites, and hydrogenation of olefin intermediates over Pt. The process can be tuned to convert different common plastic wastes, including low- and high-density polyethylene, polypropylene, polystyrene, everyday polyethylene bottles and bags, and composite plastics to desirable fuels and light lubricants.

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