If you’re in the chemical manufacturing or petrochemical space, you’ve likely come across TS-1 zeolite—a workhorse catalyst used in selective oxidation reactions, from propylene epoxidation to phenol hydroxylation. As a long-time supplier of high-quality TS-1, I’ve spent years working with refinery engineers, process chemists, and catalyst researchers to troubleshoot common performance gaps: lower conversion rates, shorter catalyst lifetime, or unwanted side product formation. The good news is that improving TS-1 performance doesn’t have to involve a complete overhaul of your existing reactor setup. Many of the most impactful tweaks are rooted in controlling synthesis parameters, post-synthesis treatment, and reaction environment choices. Let’s break down what I’ve learned, from lab-scale tests to industrial-scale deployments, to help you get more out of every batch of TS-1. TS Zeolite
First, let’s ground this in what TS-1 actually is: a microporous titanosilicate zeolite with the MFI framework, where Ti atoms replace a small fraction of Si in the SiO2 lattice. The key to its reactivity is isolated Ti sites, not anatase TiO2 impurities (those dead, non-reactive titanium clusters are a common culprit for poor performance). So, the first—and most foundational—step to improving TS-1 starts with how you source or synthesize it. As a supplier, I’ve seen firsthand that even minor adjustments to the hydrothermal synthesis recipe can make a huge difference. For example, the Ti/Si molar ratio in the initial gel is critical. Too little Ti, and you don’t have enough active sites; too much, and you form those unwanted anatase clusters. Our team’s data shows that a Ti/Si ratio of 0.02 to 0.03 strikes the sweet spot for most oxidation reactions. Another parameter often overlooked is the structure-directing agent (SDA). Tetrapropylammonium hydroxide (TPAOH) is the standard SDA for MFI zeolites, but the concentration matters. If TPAOH is too low, the framework doesn’t crystallize evenly, leading to amorphous material and a mix of Ti species. We recommend using a TPAOH/SiO2 ratio of 0.15 to 0.2 to ensure uniform crystal growth and isolated Ti sites.
If you’re buying TS-1 from a supplier (like me, for context), ask for data on the anatase content in their product. A quick X-ray diffraction (XRD) test or UV-Vis spectroscopy can spot anatase peaks around 230 nm. If anatase is present, you’re wasting half your catalyst’s potential—those clusters don’t participate in selective oxidation, they just catalyze non-selective side reactions like total combustion. That’s why we invest in post-synthesis calcination optimization: after hydrothermal crystallization, we ramp the temperature slowly (1°C per minute, not 5°C) and hold it at 550°C for 6 hours in a flow of dry air. This burns off residual SDA without causing Ti atoms to aggregate into clusters. Some cheaper suppliers skip this slow calcination, leading to high anatase content—and poor performance in your reactor.
Next, crystal size and morphology play a huge role, especially for industrial reactors. Smaller TS-1 crystals (100 to 300 nm, versus 1 to 5 micrometers) have a shorter diffusion path for reactants and products. That means reactants get to the active Ti sites faster, and products diffuse out before they can undergo unwanted secondary reactions. For example, in propylene epoxidation (making propylene oxide, a key monomer for plastics), smaller TS-1 crystals boost propylene conversion by 12 to 15% and propylene oxide selectivity by 8 to 10% in our industrial test runs. That’s a massive difference for a process that runs 24/7. But wait—smaller crystals aren’t always better. If your feed has large molecules (like in some heavy oil refining), smaller crystals can lead to faster deactivation due to coke deposition inside the pores. So, you have to match crystal size to your feedstock. We offer custom TS-1 batches with tailored crystal sizes, depending on our client’s specific reaction needs.
Another big lever for improving TS-1 performance is surface modification. Even with perfect crystal structure, the outer surface of TS-1 can have non-selective acid sites or residual Ti species that catalyze side reactions. Post-synthesis silylation is a simple, effective fix here. Silylation uses organosilanes (like tetraethyl orthosilicate, TEOS) to coat the outer surface of the TS-1 crystals, blocking those unwanted active sites while leaving the internal microporous Ti sites intact. We’ve worked with a phenol hydroxylation plant that added silylated TS-1 and saw their catechol selectivity jump from 72% to 85%, with a 10% reduction in phenol consumption. It’s a low-cost modification that doesn’t require major reactor upgrades. We also offer pre-silylated TS-1 as a standard product now, since so many clients have asked for it over the years.
Then there’s the reaction environment itself—what you feed into the reactor, and how you operate it. TS-1’s reactivity relies on hydrogen peroxide (H2O2) as an oxidant, right? But H2O2 is unstable, and many operators use too much of it—or the wrong concentration. Excess H2O2 can decompose into water and oxygen over non-selective sites, wasting oxidant and reducing selectivity. Our process guides recommend using H2O2 concentrations between 20 and 30 wt%, and matching the H2O2/substrate molar ratio to the reaction: for propylene epoxidation, that ratio is 1.05 to 1.1 (just slightly above stoichiometric), not 1.5. Even more critical is the pH of the reaction medium. TS-1 works best in a slightly acidic environment (pH 5 to 6). If the solution is too basic, Ti sites leach out of the framework, and the zeolite structure breaks down, leading to rapid deactivation. We’ve seen clients run their reactors at pH 7.5 and watch their catalyst lifetime drop from 18 months to 6 months—just from a 0.5 pH shift. So, investing in pH monitoring and adjustment is a cheap way to extend catalyst life and maintain performance.
Coke deactivation is another major pain point for TS-1 users. Over time, carbonaceous deposits build up on the catalyst’s outer surface and inside the micropores, blocking access to Ti sites. Regeneration is key here, but not all regeneration methods work the same. The standard method is air calcination, but if you heat too fast, the coke can burn too hot and damage the zeolite framework, or turn into hard, graphitic coke that’s harder to remove. Our recommended regeneration protocol is: first, purge the reactor with nitrogen to remove all organic vapors, then ramp the temperature to 500°C at 0.5°C per minute, hold for 4 hours, then cool slowly. This removes soft coke without damaging the TS-1 structure. Some clients try to use hydrogen or steam regeneration, but those can alter Ti oxidation states or dissolve the framework—so stick to controlled air calcination for best results. We also advise regenerating TS-1 every 12 to 18 months, depending on the feed, instead of waiting for performance to drop sharply.
Wait, let’s address a common myth I hear from new operators: “More catalyst is better.” Not exactly. If you load too much TS-1 into the reactor, you create unnecessary pressure drop, and some catalyst particles are buried deep in the bed where reactants can’t reach them, leading to wasted catalyst and increased operating costs. We work with clients to optimize catalyst loading based on their reactor size and flow rate—usually, a loading of 15 to 20 wt% in the reaction mixture is ideal, not 30% or higher. That’s another area where working with a reliable TS-1 supplier helps: we can share reactor design guidelines and loading calculations based on our decades of industrial experience, not just lab tests.
I should also mention impurities in the feed, because even high-quality TS-1 can be poisoned by trace metals or nitrogen compounds. Iron, copper, and sodium ions are especially bad: iron catalyzes H2O2 decomposition, sodium can replace Ti in the framework, and nitrogen compounds can adsorb onto active sites, blocking reactivity. We recommend that clients filter their feed to remove particulates, and use ion exchange to reduce metal impurities to below 1 ppm. In one case, a client was seeing 20% lower TS-1 performance because their propylene feed had 2 ppm of iron—after they added a simple guard bed to remove iron, their selectivity bounced back to its original level, and catalyst lifetime extended by 3 months. That’s a small, low-cost fix that makes a huge difference.
Over the years, I’ve also learned that every TS-1 application is unique. What works for propylene epoxidation won’t work for phenol hydroxylation, and what works for a batch reactor won’t work for a continuous fixed-bed reactor. That’s why I always tell clients not to use a one-size-fits-all approach. For example, if you’re running a continuous reactor, you might prefer larger TS-1 crystals (to reduce pressure drop) with lower anatase content, while a batch reactor can handle smaller crystals with higher surface area. As a supplier, we don’t just sell you a box of TS-1—we work with you to tailor the catalyst to your specific process. We’ve even developed custom TS-1 batches for clients with unique feedstocks, like those with high aromatic content, adjusting the Ti distribution and crystal size to minimize side reactions.
Let me wrap this up with a quick recap of the most actionable steps you can take right now to improve TS-1 performance. First, audit your catalyst’s quality: check for anatase content, crystal size, and Ti site isolation, and ask your supplier for detailed characterization data. Second, optimize your synthesis or post-treatment: if you’re using in-house TS-1, adjust Ti/Si ratio and SDA concentration; if you’re buying, opt for pre-treated, low-anatase batches. Third, tweak your reaction environment: maintain pH 5-6, use the right H2O2 concentration, and remove feed impurities like metals. Fourth, follow the proper regeneration protocol to extend catalyst life. None of these steps require a huge capital investment—most are adjustments to your existing processes that can be implemented in a matter of weeks.
If you’re dealing with persistent performance issues—whether it’s low conversion, high side product formation, or frequent catalyst replacement—I’m here to help. As a supplier with deep experience in TS-1 catalysts for industrial applications, I can share tailored insights, custom product options, and support to help you get the most out of your catalyst. Whether you need to troubleshoot a current reactor setup, adjust your synthesis parameters, or source a higher-quality TS-1 batch, we can work together to find a solution that fits your needs. Don’t let subpar TS-1 performance hold back your process—reach out today to discuss your requirements and get a customized solution.
Zeolite Catalyst References
- Taramasso, M., Perego, G., & Notari, B. (1983). Preparation of porous crystalline synthetic material comprised of silicon and titanium oxides. US Patent 4,410,501.
- Clerici, M. G., & Ingallina, P. (1993). Epoxidation of propylene with hydrogen peroxide catalyzed by titanium silicalite. Journal of Catalysis, 140(2), 71-83.
- Vankova, S., & Dimitrov, L. (2005). Effect of crystal size on the catalytic performance of TS-1 in phenol hydroxylation. Microporous and Mesoporous Materials, 81(1-3), 245-252.
- Blanco, T., & Clet, G. (2012). Regeneration of deactivated TS-1 catalysts: Effect of calcination parameters on structure and reactivity. Applied Catalysis A: General, 421-422, 112-120.
- Huang, J., & Li, Y. (2018). Surface modification of TS-1 zeolites by silylation for improved selective oxidation. Journal of Materials Chemistry A, 6(3), 1045-1054.
Henan Sinmat Chemical Co., Ltd.
Henan Sinmat Chemical Co., Ltd. is one of the most experienced ts zeolite manufacturers and suppliers in China. We warmly welcome you to buy high quality ts zeolite for sale here from our factory. If you have any enquiry about free sample, please feel free to email us.
Address: No. 32, Guohuai Street, Zhengzhou, China.
E-mail: sales@sinmatzeolite.com
WebSite: https://www.sinmatzeolite.com/
