As the world’s leading supplier of catalysts, MCHEMICAL has unsurpassed expertise in the development of emission control technologies for a wide range of market applications that protect the air we breathe. This expertise enabled MCHEMICAL to pioneer the development of the first catalytic converter for automobiles in the 1970’s and our line of emissions catalysts today.
Solid Phosphoric Acid Catalysts (Spa Catalysts)
High performance Solid Phosphoric Acid catalysts for Tubular and Chamber reactors.
Aluminum‐loaded SBA‐15 mesoporous silica and the corresponding solid phosphoric acid (SPA) catalysts were prepared, characterized by TEM, FTIR, MAS NMR, NH3‐TPD, N2 adsorption, ICP‐AES and titration of ‘free H3PO4’, and tested in cellulose fast pyrolysis. Post‐synthesis Al deposition on the silica support produced an increase of bio‐oil yield and LGO amount in pyrolysis products. The presence of Al in SPA catalysts led to the formation of aluminum phosphates, decreasing the concentration of H3PO4 species in the surface and therefore the LGO levels. The SPAs presented relatively high LGO levels in the GC–MS detectable liquid products (up to 85 peak area%) which was found to be correlated with the amount of free H3PO4 in the solid catalysts.
Aluminum grafting over SBA‐15 is an effective way to increase the selectivity to the target anhydrosaccharide. In SPAs, the presence of Al reduced the easily leachable H3PO4 amount, which is desirable from the point of view of catalyst stability because deactivation is mainly caused by H3PO4 leaching, but also led to lower levels of LGO in bio‐oil.
Syngas Catalysts (Prereforming & SNG) … Syngas, produced from natural gas or coal, is a key intermediate in the emerging technologies for gas-to-liquids (GTL), methanol-to-olefins, coal-to-liquids and fuel cells.
M CHEMICAL is dedicated in providing cutting-edge catalytic technologies for the emerging gas economy.
- HDS Catalyst
- Pre Reforming Catalysts
- HTS and LTS Catalysts
- Methanation Catalysts
Mercaptan Oxidation Catalysts
ARI-100EXL is a liquid catalyst reagent that can be used in Mercaptan Oxidation and/or Sweetening Units such as Merichem Mericat and/or those utilizing a technology by UOP.
Sulfur Recovery Catalysts/tail Gas Catalysts
Sulfur recovery refers to the conversion of hydrogen sulfide (H2S) to elemental sulfur.
Hydrogen sulfide is a byproduct of processing natural gas and refining high-sulfur crude oils. Themost common conversion method used is the Claus process. Approximately 90 to 95 percent ofrecovered sulfur is produced by the Claus process. The Claus process typically recovers 95 to97 percent of the hydrogen sulfide feedstream.
Customers can choose from two tail gas treatment options to further increase sulfur recovery. With SulfreenTM, the Claus tail gas is catalytically purified, resulting in an overall sulfur recovery rate of up to 99.5%. Here the Claus reaction takes place below the sulfur dew-point so that the sulfur is adsorbed on the SulfreenTM catalyst. The LTGTTM process, meanwhile, purifies the Claus tail gas through wet-scrubbing. By recycling the hydrogen sulfide rich stream to the unit, this method can raise sulfur recovery to 99.9%.
- Claus Catalyst
- Promoted Claus Catalysts
- Titania Claus Catalysts
- CoMo Tail Gas Catalysts
The process for producing sulfuric acid has four stages:
1. Extraction of sulfur or burn the mineral(contains sulfur) or Wet Gas Sulphuric Acid(WSA)
2. Conversion of sulfur to sulfur dioxide
3. Conversion of sulfur dioxide to sulfur trioxide
4. Conversion of sulfur trioxide to sulfuric acid
Extraction of sulfur
The most easy way to get sulfur is the recovery from natural gas and oil by Claus Process, which contain sulfur compounds, both organic and hydrogen sulfide which must be removed before they can be used as fuels or chemical feedstock to protect the downstream catalyst from poisioning. Another important source of sulfur is as sulfur dioxide from metal refining. Many metal ores occur as sulfides and are roasted to form an oxide and sulfur dioxide, such as lead and other sulfide ores include copper, nickel and zinc.
Conversion of sulfur to sulfur dioxide
Sulfur must first be converted to sulfur dioxide, the molten sulfur is sprayed into a furnace and burnt in a blast of dry air at about 1000 deg C.As excess air is used the emerging gas contains about 10-12% sulfur dioxide and 10% oxygen, by volume.
Conversion of sulfur dioxide to sulfur trioxide
The catalyst, normally is vanadium(V) oxide on silica which is generally in the form of small pellets like hollow cylindrical pellet with promoter, is to promote the oxidation and conversion of SO2 to SO3 in a cylindrical vessel which ascts as a fixed bed reactor with for separate beds loaded with the vanadium oxide catalyst, this is called contacting process.
Conversion of sulfur trioxide to sulfuric acid
The sulfur trioxide formed from the third bed (and the small amount from the fourth bed) are now converted to sulfuric acid when sulfur trioxide reacts with water.