What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Catalyst recycling on tape is a specific laboratory method: a fluorous rhodium catalyst participates in a hot organic reaction, then separates onto PTFE (Teflon) tape as the mixture cools. The tape can be moved into another reaction cycle. The 2005 demonstration used the method for ketone hydrosilylation; it does not show that ordinary tape can recycle catalysts by itself or that the approach works for catalysts generally.
How does catalyst recycling on tape work?
The method relies on a change in how the catalyst behaves as the reaction mixture cools. During the heated reaction, the fluorous rhodium catalyst is soluble in the organic medium. After the reaction, cooling causes the catalyst’s resting state to separate from the liquid and collect on PTFE tape. The tape carrying the catalyst can then be transferred to a new reaction mixture.
In the study by Long V. Dinh and J. A. Gladysz, the model reaction was hydrosilylation of cyclohexanone with PhMe₂SiH in dibutyl ether. The tape was a support and transfer aid within that particular chemical system—not the active catalyst, and not a general-purpose catalyst-recovery device.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhat did the laboratory demonstration show?
Reaction without tape
In the no-tape experiment, the researchers used 1 mol% catalyst and warmed the reaction mixture to 65 °C. They reported 98% yield after eight hours. They washed and recharged the recovered catalyst residue, then repeated the procedure three more times; each of those cycles also gave a reported 98% yield. These figures describe the authors’ specific experiment, not a general performance benchmark.
#1 Best Overall
- Optimized Capacity: 3 PACK. Measures 14.3x4.5x3 inches, each tape storage case holds up to 20 standard-sized cassette cases for efficient organization. Pack of 3 store up to 60 pcs cassette cases.
- Durable Thick Cardboard Construction: Made of special rigid cardboard, the cassette storage boxes are built to protect your cassettes from dust and physical damage.
- Title-Facing Orientation: Cassettes are stored with labels upward for instant visibility and quick retrieval.
- Strong Magnetic Closure: Securely keeps cassettes safe while allowing easy, one-handed access.
- Sleek Black Color: Neutral and stylish, blending seamlessly into any space.
Reaction with tape
For the tape-assisted sequence, the authors used 0.15 mol% catalyst and commercial Teflon tape, with homogeneous reaction conditions at 55 °C. A representative reaction gave a reported 97% yield. On cooling, the catalyst resting state separated onto the tape for transfer into subsequent cycles.
Activity retention was excellent in cycles two and three, but fell substantially in cycle four. The authors attributed the later loss to catalyst deactivation, rather than an inherent failure of the tape recovery method. With other tested ketones—2-octanone, acetophenone, and benzophenone—they reported up to 20% activity loss by the third cycle. Results therefore depended on the substrate and reaction conditions.
Rank #2
- 【Organize Your Cassette Tapes】Keep your music and recordings organized with this cassette tape organizer.
- 【Durable Design】Made of high-quality materials, these cassette organizer with lids will keep your cassette tapes safe from dust, moisture, and other damage.
- 【Easy Identification】Each cassette tape rack comes with index labels so you can easily identify and find the cassette tape you need.
- 【Hold Up to 48 Cassette Cases】These cassette storage racks can hold up to 48 cassette tape cases each, providing ample storage for your collection.
- 【Sleek Gray Design】With a modern and sleek gray design, these cassette holder storage rack will blend seamlessly with your home or office décor.
Does the catalyst stay on the tape without losses?
No. The study measured material leaving the system: rhodium leaching was 0.57% in cycle one and 5.3% in cycle two; total fluorous ponytail leaching over the first three cycles was 11.4%. These measurements are specific to the reported procedure, but they show why “reusable” should not be read as “loss-free.” The 2017 follow-up record also discusses leaching and reports that fluorous/organic liquid-liquid biphasic conditions can retain activity better than the tape procedure. EPA HERO record for the 2017 follow-up.
Can tape also deliver a small catalyst dose?
The authors also explored precoating catalyst onto PTFE tape. In principle, this lets a user deliver a low catalyst loading by tape length instead of weighing a very small catalyst quantity or preparing a standard solution. The follow-up record describes precoating and catalyst release in later cycles. This is a dosing and handling approach within the studied chemistry, not evidence that any catalyst can be stored or dispensed this way.
Rank #3
- 【Streamlined Design】Featuring an organizer with a lid, this cassette tape case is stackable, saving space while ensuring your collection is accessible and tidy.
- 【Extensive Capacity】Each cassette storage case remarkably fits up to 48 cassettes. Organize your precious collection efficiently and impressively.
- 【Sturdy Construction】Crafted with thickened non-woven fabric and high-stiffness cardboard, this cassette tape carrying case promises long-lasting use and enhanced protection for your tapes.
- 【Protective Haven】Protect your cherished cassettes from scratches and dust with our resilient cassette tape holder case. An isolation chamber for your beloved tapes!
- 【Organized Bliss】Designed with categorized storage, this cassette tape box makes it effortlessly quick and easy to locate your desired tapes. Say goodbye to clutter!
As the paper’s corresponding author J. A. Gladysz put it, “This approach provides not only a convenient means of catalyst recovery, but also of catalyst delivery.” Dinh and Gladysz, 2005.
Is catalyst recycling the same as catalyst regeneration?
No. Recycling here means recovering a catalyst and using it in another reaction cycle. Regeneration means restoring the activity of a spent catalyst, often through treatment that removes surface coatings or absorbed species; whether that is possible depends on what caused the deactivation and how severe it is. Catalysts Europe’s explanation of catalyst regeneration.
Rank #4
- Cassette Storage Box: Case size is 14.25" x 4.5" x 3". This cassette tape storage case is designed to fit standard tapes. Snag fit, neat storage.
- Large Capacity: Each box can storage 20 PCS of cassette tapes. Easy to storage and organize your collections.
- Store Tapes with The Titles Showing: 3 inches tall. Storage cassettes with titles upward, easier to find and pick, makes organizing your audio cassettes effortless and convenient.
- Strong Magnetic Closure: The cassettes storage case has a concealed and sturdy magnetic closure that allows the flip-top storage box to be easily open and closed repeatedly.
- Sturdy and Quality: The cassette holder has a thick, sturdy board construction with a water-resistant laminate. Cardboard but very rigid, tough. The storage box is sturdy enough to stack on each other.
What are the limits of the tape method?
- It is chemistry-specific. The evidence is a fluorous rhodium system demonstrated for ketone hydrosilylation, especially cyclohexanone in dibutyl ether.
- Reuse does not guarantee stable activity indefinitely. The reported tape sequence retained activity well through cycles two and three, then lost substantial activity in cycle four; other ketones also showed activity loss.
- Recovery can involve leaching. The authors measured both rhodium and fluorous ligand losses.
- It is laboratory evidence, not an industrial validation. The cited studies do not establish commercial-scale performance, broad compatibility with other catalysts, or lifecycle benefits.
The original experimental report is Dinh and Gladysz’s 2005 paper; the later record is EPA HERO’s summary of a 2017 follow-up.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
