Molecular Sieve Catalyst TRIZ Cases

Rare-earth molecular sieve adsorbents limit coke buildup and pore plugging in zeolite paraffin alkylation, extending catalyst life and C8 selectivity.

Methanol-adjusted co-feeding of CO2 and naphtha boosts p-xylene selectivity while recycling benzene and toluene for lower-cost production.

Fermentation-derived mevalonic acid is catalytically converted into isoprene and other intermediates to cut petroleum dependence, cost, and processing time.

Phosphorus-modified MWW weakens strong acid sites to improve p-xylene selectivity, catalyst stability, and carbon deposition resistance.

A two-step catalytic route converts biomass to p-xylene via 2,5-hexanedione, improving selectivity while reducing process complexity and cost.

Specific zeolite catalysts convert renewable alcohols into BioLPG with high C3-C4 selectivity while enabling catalyst rejuvenation and longer use.

Chemical bonding between zeolite and alumina improves hydrogenation-alkylation coupling, reducing cyclohexane by-products and separation energy.

A two-stage zeolitic and metal catalyst process with oligomerate recycle manages ethylene dimerization heat while producing jet-range distillate fuels.

Low-dew-point calcination air limits zeolite dealumination, preserving catalyst activity and monoselectivity for mono-alkylated aromatics.

Controlling oxygen and steam below 0.1% in regenerated catalyst return lines cuts olefin impurities and reduces catalyst loss.

A high-acidity microporous and metal oxide hybrid catalyst boosts carbon conversion and shifts syngas products toward propane at lower temperatures.

A small secondary reactor converts olefins from drag and depropanizer off-gas streams into C9+ blendstock, cutting carbon losses.

A single-bed alumina-zeolite catalyst converts C1-C5 alcohols to C2-C5 olefins with high selectivity, lower process complexity, and less aromatics.

Mesoporous 8MR zeolites dehydrate branched alcohol feedstocks to linear alkenes at lower temperature while limiting coke and trapping nitrogen impurities.

A two-catalyst reactor sequence converts C2-C5 alcohols into C2-C7 olefins in one stage, cutting unit operations and aromatic byproducts.

A UZM-54 and mordenite catalyst boosts xylene selectivity while reducing aromatic ring loss and improving stability in heavy aromatic conversion.

Balanced medium-strong acidity and moderate hydrogenation metals raise alkyl aromatic conversion while limiting ring-loss side reactions.

A germanium-containing SSZ-124 pore framework improves selectivity in hydrocarbon conversion while enabling adsorption and separation.

Zeolite catalyst tuning controls branching index and favors C10-C13 olefins, reducing downstream separation in olefin oligomerization.

A butane stream with hydrogen reactivates oxidized hydrogenolysis catalysts, improving conversion stability, catalyst life, and ethane selectivity.

A bonded porous oxide catalyst maintains butadiene selectivity at high ethanol concentrations, reducing by-products and raising production efficiency.

Framework-substituted USY zeolite with Ti, Zr, or Hf converts C9+ aromatics into BTX with higher xylene selectivity and less benzene and toluene.

Encapsulating sub-2 nm catalytic metals in medium- or large-pore zeolites with alkali additives limits sintering and preserves activity at high temperature.

Controlled gel chemistry and OSDA templating suppress SAPO-56 co-crystallization, yielding pure CIT-17 with higher propylene selectivity in MTO.

Stacked flake aluminosilicate zeolites improve n-dodecane cracking conversion while increasing selectivity to C2-C4 olefins and C3-C4 paraffins.

Ordered cubic mesopores in zeolite beta improve arene alkylation conversion and enable milder reaction conditions in the reactor.

A spinel chromium catalyst uses silica and tailored promoters to raise propylene selectivity while improving strength, stability, and attrition resistance.

Coupling naphtha reforming with methanol methylation in a circulating fluidized bed raises para-xylene content while cutting separation energy.

Acid-catalyzed conversion of C20 2-substituted alpha olefins expands feedstock use while controlling C40 dimer by-products.

Annular coke control subzones and staged temperatures narrow catalyst coke distribution, boosting DMTO light olefin selectivity.

Large-pore acid zeolites dehydrate C2-C6 alcohols at lower temperature to raise mono-olefin yield while limiting coking and catalyst decay.

Refineries can convert benzene to higher alkylated aromatics while removing sulfur in one fixed-bed process, preserving or increasing RON.

Staged feed distributors separate methanol and benzene zones to coordinate MTO and alkylation, improving p-xylene and light-olefin selectivity.

Asymmetric unbridged metallocene catalysts produce high-purity PAO dimers for acid-catalyzed trimer formation, avoiding intermediate separation stages.

An asymmetric metallocene catalyst produces PAO dimers with over 90% vinylidene and no vinylene before trimerization.

Selective catalysts convert ethylene into C6 and C8 intermediates for hydrotreating and aromatization into benzene.

Strong-acid resin loaded into a molecular sieve supports 60%+ olefin conversion and longer catalyst life in coal-based benzene alkylation.

Replacing high-temperature thermal cracking, gallium zeolites catalyze alcohol dehydration for selective light olefin production at lower temperatures.

Sequential dealkylation and transalkylation limit heavy reformate upgrading; a layered mordenite–ZSM-5 catalyst performs both reactions together to produce BTX.

Zinc and sodium-free crystallization produces small SSZ-41 crystals while suppressing MTW impurity phases.

Replacing oxidative burn-off and oxychlorination with hydrocarbon and hydrogen treatment simplifies activation while restoring oxidized catalyst activity.

Controlled oxidative dehydrogenation uses a micro-mesoporous catalyst to sustain activity and improve olefin yield at lower temperatures.

This case replaces costly toxic templates with seed-assisted MWW crystallization for active, selective solid acid alkylation.

This case uses zinc-doped MFI zeolite and hydrothermal silica deposition to balance paraxylene selectivity, yield, and diffusion.

Hydrothermal crystallization creates monoclinic and orthorhombic MFI forms to limit coking and sustain propylene and ethylene selectivity.

Doped zeolites convert glycerol and aldehydes to acrolein and isoprene, improving selectivity and simplifying downstream separation.

Fractionation, dual recycle streams, and hydrogenation help convert olefinic feedstocks into specification-ready kerosene and gas oil.

Controlled hydrothermal calcining stabilizes phosphorus-modified sieves for active cracking.

Joule heating inside conductive particles maintains 200–500°C dehydration conditions while reducing external heat loss and emissions.

Progressive catalyst loading across series reactors limits thermal runaway risk while supporting butane conversion and ethane selectivity.