Oxygen Generator Molecular Sieve (13X & Li-LSX)

What is Oxygen Generator Molecular Sieve?

Key Takeaways:

• Dual Grades: Available in 13X for cost-effective industrial PSA systems and premium Li-LSX for compact medical oxygen concentrators.
• High Purity: Excellent N₂/O₂ selectivity enables consistent oxygen purity of 90-93% (13X) or 93-95% (Li-LSX).
• Long Service Life: Delivers 3-5 years of reliable performance with proper inlet air pretreatment and moisture control.

Oxygen generator molecular sieve is a high-performance crystalline aluminosilicate adsorbent engineered for Pressure Swing Adsorption (PSA) and Vacuum Pressure Swing Adsorption (VPSA) oxygen production — from large industrial oxygen generators to compact medical oxygen concentrators. It selectively adsorbs nitrogen from compressed air, allowing oxygen to pass through as purified product gas.

We supply two distinct grades: 13X sodium molecular sieve for cost-sensitive industrial applications, and Li-LSX lithium molecular sieve for high-efficiency medical oxygen concentrators and premium industrial systems. For a deeper look at how the technology works, see our oxygen generator sieve guide.

Key Benefits

• High Adsorption Capacity: 13X offers ≥10% wt nitrogen capacity; Li-LSX delivers ≥16% wt — reducing required bed size and improving system efficiency
• Superior Selectivity: N₂/O₂ selectivity of ≥3.0 (13X) and ≥3.5 (Li-LSX) ensures consistent oxygen purity of 90% or higher
• Fast Kinetics: Rapid adsorption and desorption enables short cycle times and maximized oxygen output
• Long Service Life: 3-5 years of reliable service with proper operation and regeneration
• High Mechanical Strength: Excellent crushing strength and low attrition rate prevent particle breakage
• Versatile Sizing: Bead sizes from 0.4mm to 2.5mm suit different equipment designs

How It Works

Oxygen generation molecular sieves operate on the principle of pressure swing adsorption:

1. Adsorption Phase: Compressed air flows through a bed of molecular sieve beads under pressure. Nitrogen molecules, being more polar and having a quadrupole moment, are preferentially adsorbed onto the internal surface of the sieve pores. Oxygen molecules pass through and are collected as product gas.
2. Desorption/Regeneration Phase: When the bed becomes saturated with nitrogen, pressure is reduced (or vacuum is applied), causing the adsorbed nitrogen to desorb and vent to atmosphere, regenerating the sieve for the next cycle.

By alternating two or more beds between adsorption and regeneration, PSA/VPSA systems provide continuous oxygen production. For facilities that also require on-site nitrogen supply, the same PSA principle works in reverse using carbon molecular sieve— adsorbing oxygen instead of nitrogen to produce high-purity nitrogen gas.

Available Types

13X Sodium Molecular Sieve — The standard workhorse for industrial oxygen generation. Good performance at an economical price point, ideal for medium-to-large industrial PSA/VPSA systems. See our 13X Molecular Sieve product page for full specifications.

Li-LSX Lithium Molecular Sieve — Premium high-performance sieve with lithium-exchanged, low-silica X-type structure. Higher nitrogen capacity and selectivity than 13X, enabling smaller, more efficient systems — the preferred choice for medical oxygen concentrators.

Budget Alternative: For applications where upfront cost matters more than purity, 5A molecular sieve can also be used for lower-purity oxygen enrichment (typically 80-90%), though both 13X and Li-LSX offer better selectivity and higher achievable purity for oxygen generation systems.

Typical Performance Specifications

13X Type: Oxygen Purity 90-93% | N₂ Capacity ≥10% wt | Selectivity ≥3.0 | Service Life 3-5 years | Recommended for: Industrial

Li-LSX Type: Oxygen Purity 93-95% | N₂ Capacity ≥16% wt | Selectivity ≥3.5 | Service Life 3-5 years | Recommended for: Medical / Premium Industrial

Packaging & Shipping

We offer flexible packaging and shipping options to suit your project scale and logistics requirements.

Standard Packaging:

• 25 kg drums (moisture-proof, suitable for trial orders and small batches)
• 150 kg steel drums (standard bulk packaging for industrial orders)
• 500 kg super sacks (most popular for industrial bulk orders)
• 1000 kg jumbo bags (for large-scale projects)
• Custom packaging available on request

Minimum Order Quantity (MOQ):

• 1 ton (entry-level orders accepted — perfect for first-time customers)
• 5+ tons (standard bulk orders)
• Container-level supply for long-term partnerships

Container Loading Capacity:

• 20'GP container: 18-20 tons (palletized)
• 40'GP container: 22-24 tons (palletized)
• 40'HQ container: 24-26 tons

Loading Ports: We ship from major Chinese ports based on your requirements: Shanghai, Qingdao, Tianjin, Ningbo, and Shenzhen.

Lead Time:

• Stock orders: 7-15 days from payment confirmation
• Made-to-order: 20-30 days

Shipping Terms: FOB / CIF / CFR / EXW — flexible based on your destination and preferences.

Documents & Certificates

We provide complete documentation for every order:

📄 Technical Data Sheet (TDS) — Confirmed with you during product selection, ensuring exact specifications match your application requirements.

📄 Safety Data Sheet (SDS) — Provided before shipment, meeting all international transportation and handling standards.

📄 Certificate of Analysis (COA) — Issued for each production batch, delivered with your shipment for full quality traceability.

Additional documents available on request: Certificate of Origin (COO), Packing List, Commercial Invoice, Third-party Inspection Report (SGS / BV), Form E (for Middle East destinations with applicable tariff benefits).

Selection Guide

For Medical Oxygen Concentrators (Home & Hospital): Li-LSX lithium molecular sieve — higher purity (93-95%), better selectivity, smaller bed volume. Bead size: 0.4-0.8mm for fast kinetics in short-cycle machines.

For Portable Oxygen Concentrators: Li-LSX (0.4-0.8mm beads) — highest capacity per unit volume for lightweight, compact designs.

For Industrial PSA Systems (90-93% purity): 13X sodium molecular sieve — economical, proven performance. Bead size: 1.6-2.5mm for low pressure drop in larger beds.

For High-Purity Industrial Systems (93%+) or Large VPSA Generators: Li-LSX for higher purity requirements, or 13X where mechanical strength and cost matter more, in bead sizes of 1.0-2.5mm depending on system design.

Regeneration

Oxygen generator molecular sieve is regenerated in-cycle as part of normal PSA/VPSA operation — no separate regeneration step is needed:

• PSA regeneration: The saturated bed is depressurized to atmospheric pressure, releasing adsorbed nitrogen, typically within seconds as part of the automated cycle
• VPSA regeneration: A vacuum pump pulls the bed below atmospheric pressure for more complete nitrogen desorption, improving sieve utilization and oxygen recovery
• Cycle time: Most systems complete a full adsorption-regeneration cycle in 20-60 seconds, alternating between two or more parallel beds for continuous oxygen output

Over thousands of cycles, sieve capacity gradually declines due to irreversible fouling from oil, moisture, or particulates in the inlet air. Proper pretreatment (see Operation & Maintenance below) is the single biggest factor in maximizing service life — typically 3-5 years under normal conditions.

Operation & Maintenance

Proper inlet air treatment is essential for maximum sieve life:

• Oil removal: High-efficiency oil filters prevent the leading cause of premature sieve degradation
• Water removal: Refrigerated or desiccant dryers remove liquid water and reduce humidity
• Dust filtration: Particulate filters prevent debris from entering the sieve bed

Operating pressure should follow your system manufacturer's recommendations (typically 2-8 bar for PSA), with inlet temperature between 5-35°C for optimal performance. Regularly check pre-filters, monitor oxygen purity and flow rate, and avoid rapid pressure changes that can cause mechanical stress on the beads.

Frequently Asked Questions

Q: What oxygen purity can I expect from PSA oxygen generator sieve? A: With properly designed systems, 13X typically produces 90-93% oxygen, while Li-LSX achieves 93-95%. Medical oxygen concentrators using Li-LSX consistently deliver 93% ±3% oxygen, meeting international pharmacopeia standards.

Q: How long does molecular sieve last in an oxygen concentrator? A: With proper pretreatment and regular filter changes, our sieves typically last 3-5 years. Home oxygen concentrators usually require replacement every 3-4 years with average use.

Q: Can I replace 13X with Li-LSX in my existing oxygen generator? A: In many cases, yes — Li-LSX's higher capacity may allow higher purity or greater output at the same bed volume. We recommend consulting our technical team to confirm compatibility for your specific system.

Q: How do I know when the sieve needs replacement? A: Common indicators: oxygen purity dropping below required levels and not recovering with adjustments, increased pressure drop across the bed, reduced flow rate, or visible sieve dust in outlet filters.

Q: What bead size should I use? A: 0.4-0.8mm for medical and portable concentrators (fast kinetics); 1.6-2.5mm for large industrial generators and VPSA systems (lower pressure drop); 1.0-1.6mm as a balanced choice for medium systems.

Need a Custom Solution?

For bulk pricing and grade recommendation, please send your purity requirement and system type (industrial PSA/VPSA or medical concentrator) to us. Our technical team will get back to you within 24 hours with a tailored solution.

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