Catalytic hydrolysis of HCN on ZSM-5 modified by Fe or Nb for HCN removal: surface species and performance

Abstract

Interactions present between Fe and Nb species resulted in larger amounts of isolated Fe3+, Nb5+, oligomeric FexOy and NbxOy clusters on zeolite catalysts, resulting in improved HCN hydrolysis.

Ammonia-assisted reforming and dehydrogenation toward efficient light alkane conversion

“…However, it might be a complement to the conventional SteamReform and other techniques, especially for on-site CO x -free H 2 production. Additionally, new catalytic processes for HCN transformation, such as catalytic hydrolysis (HCN + H 2 O → NH 3 + CO 99–101 or NaCN + H 2 O → HCOONa + NH 3 102,103 ) must be developed to convert HCN back to NH 3 and/or other chemicals and intermediates. Although HCN hydrolysis has been studied previously, such a process is not being used in industry and the process is of interest only for exhaust gas treatment currently.…”

Intermetallic Ni3Ga1 Catalyst for Efficient Ammonia Reforming of Light Alkane

“…Consequently, H 2 from the BMA process is frequently used as fuel for heating the reactor in the current industry. Nonetheless, we believe that such a reaction could be employed for CO x -free H 2 production if the reaction can be realized at mild temperatures and green ammonia, as an H 2 carrier, is ubiquitously available from renewable energy. , Indeed, ammonia as a carbon-free H 2 carrier has been extensively recognized recently. − Considering that the market size of H 2 is larger than HCN, the catalytic hydrolysis (HCN + H 2 O → NH 3 + CO − or NaCN + H 2 O → HCOONa + NH 3 , ) can be employed to convert HCN back to NH 3 . Although we understand HCN hydrolysis, currently, it is not employed in industry, and the process is of interest only for exhaust gas treatment.…”

Ammonia-Assisted Light Alkane Anti-coke Reforming on Isolated ReOx Sites in Zeolite

“…They contain 18.2–20 wt % of hydrogen and can be transported in liquid form such as NH 3 . The ammoreforming of light alkanes co-produces stoichiometric amounts of HCN, which can be easily separated from H 2 through adsorption using the existing industrial technology employed by the Andrussow process and can be converted through hydrolysis for NH 3 recycling and co-produce CO (eq ) − or HCOOH (eq ). , Additionally, hydrogen cyanide and metal cyanides are value-added chemicals that have been widely used in gold mining, metal hardening, electroplating, as well as in the chemical syntheses of adiponitrile, methyl methacrylate, cyanuric chloride, and so forth .…”