Shape selectivity of zeolite for hydroisomerization of long-chain alkanes

Abstract

The matching degree between the zeolite channel size and the isomer size determines the product distribution of dodecane hydroisomerization.

Hydroisomerization Catalysts for High-Quality Diesel Fuel Production

“…As a result, molecules of the specific reactant may enter one of the pores and do not enter to the other one (molecular traffic control) (Figure 6b). Otherwise, the ends of the straightchain alkanes may enter simultaneously into two (or more) adjacent pores (Pore mouth & key-lock selectivity) (Figure 6c) [49][50][51][52][53].…”

Hydrophilic amphibious open-cell macroporous sponge by Hofmeister effect induced nanofibrils

“…4,5 A marvelous feature of these hydrophilic sponges is their absorption of huge amounts of water while keeping their shapes, despite the tiny mass of the solid scaffold of sponges. 6 Many researchers have developed various kinds of hydrophilic sponges using polymers including polyimide, 7 polyurethane, 8 polymethyl methacrylate, 5,9 poly (N-isopropylacrylamide) 10,11 and poly(vinyl alcohol) (PVA). 12 However, a simple and low carbon route to prepare the hydrophilic sponge is still lacking.…”

Toward Superior Hydroisomerization Catalysts through Thermodynamic Optimization

“…There is also a plurality of opinions on where alkenes isomerize and crack. Some consider it established that isomerization and cracking occur throughout 0.50–0.58 nm wide pores. ,, Others assume that these pores are inert except for a small sliver near the pore ends, as a basis for “pore mouth” and “key-lock” imagery. ,,,,,− Some have proposed compromises. , Others ignore any assumed inertness and implicitly assume pores partake fully in isomerization and cracking. ,,,,,,,, …”

“…The recently redoubled efforts to better understand renewable fuels and lubricants’ production coincides with the arrival of hydroisomerization catalysts that exhibit an unprecedented effectiveness and that use the least raw material to produce the most products. − This mitigation of traditional limitations has spurred record branched isomer yields, has helped identify the causes of the historic limitations, and has prompted state-of-the-art molecular simulations to elucidate the impact of adsorbed phase properties on hydroisomerization effectiveness. The resulting improvement in understanding should facilitate bringing renewable fuels and lubricants’ production to the next level of carbon efficiency.…”