Themed collection Catalysis on Zeolites

Editorial for the themed issue “Catalysis on Zeolites”.

Hydrogenation of polyaromatics coupled with selective ring opening (SRO) of naphthenes over bifunctional noble metal/zeolite catalysts can be applied to bring low-quality diesel cuts like LCO into cetane specifications.

This Perspective article focuses on the recent progress and research directions in the preparation of hybrid organic–inorganic zeolites for applications in heterogeneous catalysis.

Emerging concepts and novel possibilities in catalysis by zeolites for a new scenario in chemical and energy vector production.

Two-dimensional zeolites have been studied and developed as diverse and fundamentally new forms of 3D framework structures.

Biomass conversion to fuels requires elimination of oxygenated functionalities along with formation of C–C bonds to help keeping the largest possible amount of carbon in the fuel range (e.g. C7–C15).

Mesopore incorporation into ZSM-5 enhances the dispersion of Pd nanoparticles significantly accelerating m-cresol conversion relative to a conventional microporous ZSM-5, and dramatically increasing selectivity towards the desired methylcyclohexane deoxygenated product.

Pore mouth hydrogenation of vegetable oil with Pt/ZSM-5 is confirmed by the similar intermediately melting product selectivity for various crystal sizes.

We investigated the effects of hydrothermal deactivation and biomass metal contamination on the properties and catalytic performance of commercial ZSM-5 catalysts.

The present work systematically studies the effect of the operation conditions of biomass catalytic pyrolysis on parameters like bio-oil oxygen content and mass yield, but also on additional indicators, such as the distribution of oxygen and chemical energy among the products.

Sn-Beta modified with cations such as Li and Na showed better catalytic performance than non-modified Sn-Beta with “open” sites in Baeyer–Villiger oxidation.

Lamellar and pillared ZSM-5 zeolites (L-ZSM-5 and PI-ZSM-5, respectively) were synthesized and tested in the catalytic cracking of low-density polyethylene (LDPE).

Modified mordenites have been used in the direct conversion of glucose into 5-hydroxymethylfurfural (5-HMF) in two different media: the ionic liquid 1-butyl-3-methylimidazolium bromide ([BMIM]Br) and a biphasic system composed of water–acetone and ethyl acetate.

Framework-substituted MCM-22 with up to 5% Ce was prepared by a conventional non-TEOS-based method.

Selective oxidation of sulphides is a straightforward method of preparation of organic sulphoxides and sulphones. Bulky sulphides can be selectively oxidized using layered crystalline titanosilicate catalysts with H₂O₂ as the oxidant.

The physico-chemical properties of the small pore SAPO-18 zeotype have been controlled by properly selecting the organic molecules acting as organic structure directing agents (OSDAs).

The synthesis of a micro-mesoporous EUO zeolite with a significant volume of intercrystalline mesoporosity revealed an outstanding result in the challenging industrial hydroisomerization of ethylbenzene.

The synthesis and characterization of SAPO-57 and SAPO-59, two new members of the ABC-6 family of zeolite structure, together with their methanol-to-olefins performance, are presented.

Effect of micro–meso porosity of MWW zeolites on the catalytic linear alkylbenzene synthesis was studied.

Ingeniously selecting zeolite topology and acidity, reaction temperature and guest molecule loading enables tuning the reaction mechanism of zeolite-catalyzed methylation reactions.

Alkali-activated zeolites are active, selective and stable catalysts for ethanol dehydrogenation to acetaldehyde. Molecular oxygen eases hydrogen abstraction from the adsorbed ethoxide intermediate boosting the catalytic performance.

The effect of physicochemical properties on catalyst deactivation, overall olefin selectivity and ethylene/propylene ratio during the methanol-to-olefins (MTO) reaction is presented for two zeolites with the DDR topology, Sigma-1 and ZSM-58.

The impact of SO₂ on NH₃ oxidation, an undesired side reaction that can occur during NH₃-SCR, was studied using Cu-SAPO-34.

High suppression of ethylbenzene formation could be successfully achieved by adjusting the Si/Al ratio of hierarchical porous ZSM-5.

Gas-phase hydroconversion of ethylbenzene was investigated using *MRE, MFI and MTW-type zeolite nanosponges with a hydrogenating component (Pt/Al₂O₃). Spacious channel interconnections in MFI was concluded to remarkably impact product selectivity compared to *MRE and MTW.

Engineering site-specific interactions, by introducing complementary transition-metal ions within nanoporous architectures, affords tunability in solid-acid catalysed transformations.

A screening of Pd/zeolite-based catalysts in the PrOx-CO reaction in H₂-rich streams was performed using zeolites with different cations (H⁺, Na⁺ and Cs⁺) prepared by ion exchange and framework type (MFI and FAU).

Deposition of pyrolytic carbon on the surface of mesoHZSM-5 improves the activity, C5–C9 selectivity and decreases CH₄ selectivity by weakening cobalt-support interaction.

The epoxidation of methallyl chloride (MAC) to 2-methyl epichlorohydrin (MECH) with H₂O₂ using TS-1 microsphere catalysts (TS-1-MS) in a continuous slurry reactor was investigated.

A combination of bead-milling, subsequent recrystallization and acid treatment of micron-sized ZSM-5 zeolite can provide a highly efficient ZSM-5 nanoparticle catalyst.

Sulfur poisoning is worse in SCR conditions as seen in the figure. Sulfur can be gradually removed during SCR conditions until a certain limit. Sulfur is removed more easily in the front part of the catalyst. Increased ammonia storage is observed due to storage on sulfur species.

The ideal support characteristics for immobilization of the Hoveyda–Grubbs 2 catalyst were defined in the metathesis of cyclooctene and the reaction mechanism to cyclic oligomers was unraveled.