Made-in-China.com's Chemical Auxiliary & Catalyst directory alone lists more than 2000 manufacturers and 6000 products under the industrial chemicals branch, with Jiangxi (Pingxiang), Liaoning (Dalian), and Tianjin functioning as the three dominant production clusters for alumina carriers, molecular sieves, and palladium-based deoxidizers [S1][S3].
Across the same index, 28+ dedicated factory pages disclose ISO9001:2015 quality systems paired with ISO14001 environmental and ISO45001:2018 occupational certifications, and the smallest listed MOQ is 1 ton for noble-metal catalysts, while photocatalyst TiO2 grades ship in 1 kg samples from US$3.00 per kilogram [S3][S5].
Catalyst carrier families and the suppliers behind each
Gamma-alumina balls in 1–2 mm and 3–5 mm grades are listed as direct catalyst carriers and fluoride/arsenic-removal adsorbents by Pingxiang-based manufacturers, with product codes tied to CO2-PSA and insulating-glass molecular sieve grades 3A, 4A, 5A, and 13X [S3]. Activated alumina appears in 13X-HP and 13X-APG variants for oxygen PSA, and zeolite 13X is offered as a separate SKU for oxygen VPSA systems, which is the typical first gate to verify when the application is air-separation feed gas drying [S3].
Palladium-loaded deoxidizers carry explicit model codes (O-345, HC-1, M-849) for ethylene purification and methanation service, and Dalian-listed suppliers (cataly.cn) ship them with 1-ton MOQs and ISO9001:2015 / ISO45001:2018 / ISO14001 certification [S3]. For TiO2 photocatalyst service, the index shows nano-TiO2 at 99.9% purity priced from US$3.00/kg, with photocatalyst deodorants and bactericidal grades bundled into the same supplier card as air-purifier intermediates [S5].
Selection criteria: carrier geometry, active metal, and the certifications that actually clear a vendor audit
The first gate is active-metal system. The listings show honeycomb ceramic and activated alumina among industrial catalyst support products [S3], and industrial photocatalyst products including titanium dioxide and deodorant formulations [S5]. Pd-based deoxidizers are typically priced per ton (1-ton MOQ), while photocatalyst TiO2 is sold per kilogram with sample-tier MOQs, and that price gap is a useful first proxy for which family the application actually needs [S3][S5].
The second gate is carrier geometry. Spherical gamma-alumina in 1–6 mm diameters is the default for fixed-bed deoxo and drying service, Pall rings and ceramic honeycombs dominate packed-tower VOC and flue-gas service, and molecular sieves (3A/4A/5A/13X) are specified wherever the duty is selective adsorption rather than reaction [S3]. The third gate is paperwork: across the directory the consistent certification stack is ISO9001:2015 for QMS, ISO14001 for environmental, and ISO45001:2018 for safety, and suppliers that publish all three on the same page (e.g. the Langfang and Pingxiang audited factories) are the ones to shortlist for European and North American EPCs [S3].
Comparison of the main catalyst options against four decision criteria
On a side-by-side basis, Pd/alumina deoxidizers (O-345, HC-1) score best on trace-O2 removal to sub-ppm and on documented ISO certification, but they carry the highest unit cost and 1-ton MOQ floor [S3]. Zeolite molecular sieves (3A/4A/5A/13X) score best on bulk drying and CAPEX per ton, with broad Pingxiang supply, but they are adsorbents, not true catalysts, and lose capacity above 350 °C [S3]. Gamma-alumina balls are the most versatile carrier substrate, offered in 1–6 mm and as fluoride/arsenic adsorbents, with the widest supplier pool [S3].
Nano-TiO2 photocatalyst (anatase, 99.9% min.) scores best on visible-light deodorization and on sample-tier MOQ (1 kg from US$3.00), but it is consumed/poisoned by silica dust and oil aerosols and is rarely specified for hydrocarbon-process service [S5]. For a refinery or ethylene-plant buyer, the realistic spec tree starts with Pd on alumina; for a water-treatment or air-purification OEM, the same supplier index points to TiO2 photocatalyst as the entry SKU [S3][S5].
Who this list is for, and who it is not for
Made-in-China.com's verified listings serve procurement engineers who need factory-direct pricing, ISO paperwork, and 1-ton-class MOQs for process plant or water-treatment OEMs; a 1 kg photocatalyst sample at US$3.00 is the entry SKU for R&D labs doing deodorant formulation [S3][S5]. The same directory is not a substitute for licensed catalyst technology from majors (Clariant, BASF, Johnson Matthey, Honeywell UOP) for licensed process units such as hydrocracking, reformer CCR, or sulfuric-acid contact, because the model-code listings are for general industrial auxiliary and gas-purification service, not licensed refining catalysts [S3].
Buyers who need 50+ ton/month volume, dedicated technical service, and license guarantees will outgrow these factory listings; the index is built for spot buys, small-lot qualification, and mid-volume OEM supply, and the Sourcing Lens and Audited Supplier Reports on the platform are the practical workaround for verifying a factory's real production scale before placing a 1-ton Pd order [S1][S3].
Limits, failure modes, and verification steps before issuing a PO
Two failure modes are visible in the listing data. First, photocatalyst TiO2 is sold at 99.9% purity but with no published crystal-phase ratio (anatase vs rutile), and that ratio is the single largest determinant of photocatalytic activity, so it must be requested on the COA before shipment [S5]. Second, Pd-based deoxidizers in the O-345/HC-1 family are typically specified by surface area and Pd loading (wt%), and the listed SKUs do not publish that number, so the engineering gate is to require a 3rd-party BET surface area report and ICP Pd-loading certificate as part of the pre-shipment sample protocol [S3].
For storage and handling, noble-metal catalysts on alumina are pyrophoric in the reduced state and must be shipped passivated under N2, while zeolite molecular sieves are hygroscopic and need sealed drums; a verified supplier will declare both on the datasheet, and the audited-supplier report (linked from each manufacturer card on the directory) is the practical place to confirm packaging, lead time, and pre-shipment inspection scope [S3]. Carriers themselves, including gamma-alumina and ceramic honeycomb, are covered under the broader industrial ceramic category, which is the right reference page when the spec call-out is crush strength, pore volume, and refractoriness rather than the active metal [S3].
Cross-category context: photocatalysts, additives, and adjacent supplier clusters
Photocatalyst suppliers sit inside the same Made-in-China.com chemicals branch as industrial additives, where Hebei Laibiao Technology (carbon raiser, calcined anthracite, graphite electrode) lists calcined petroleum coke at US$200–400 per ton and Shanghai High-Lube Additives lists additive packages at US$2750–10230 per ton; the 10× price gap between carbon additives and Pd/alumina catalysts is the cleanest pricing benchmark for a procurement engineer building a capex line item [S1]. Adjacent lighting, imaging, and inspection equipment that often ships into the same EPC package is catalogued on the industrial camera and industrial borescope reference pages, which matter when the catalyst-supplier audit requires visual inspection of reactor internals or sintering-furnace monitoring [S1].
The photocatalyst index also shows related search terms (lithopone, rutile TiO2, whitening agent, photocatalyst air purifier, complex photocatalyst) and product adjacencies such as car-bactericidal deodorant and house-used photocatalyst, which signal that nano-TiO2 suppliers are increasingly bundling consumer-air-purification SKUs alongside industrial grades, useful for OEM buyers cross-selling consumer and industrial SKUs from the same upstream line [S5].
Track for the next update: (1) whether Pd-loaded deoxidizer listings begin to publish ICP Pd-loading certificates directly on the product page instead of only via inquiry, and (2) whether photocatalyst TiO2 SKUs add a published anatase/rutile ratio to the standard datasheet, both of which would shift the supplier-shortlist gate from inquiry-based qualification to datasheet-only qualification.
Background reading: Steel plate selection for cleanrooms: grade, finish, and thickness gates.