Pressure induced enhancement of shape selective phenol methylation

Natural aluminosilicates for catalytic depolymerization of polyethylene to produce liquid fuel-grade hydrocarbons and low olefins

“…Despite HZSM-5 having the highest total acid site density and strength (more than 80% of initial Brønsted acid sites are capable of retaining chemisorbed pyridine at 450 • C), its microporous structure (HZSM-5 has a three-dimensional pore structure consisting of two interconnecting 10-membered ring channels, one of which is sinusoidal (0.53 × 0.56 nm) and the other straight (0.51-0.55 nm) [30]) imposed severe sterical hindrance and mass transfer limitations for diffusion within its pores, which excluded the majority of them from participating in the depolymerization reaction [13]. On the other hand, mass-transfer limitations are less pronounced for Brønsted acid sites, high total pore volume and large pore diameter, this material has an inherent weakness, i.e.…”