Preparation and characterization of Ni/mZSM-5 zeolite with a hierarchical pore structure by using KIT-6 as silica template: an efficient bi-functional catalyst for the reduction of nitro aromatic compounds

Abstract

Ni/mZSM-5 hierarchical zeolite and the acidic form of it were prepared as novel bi-functional catalysts which showed excellent activity for reduction of nitro aromatic compounds in aqueous medium at room temperature.

Fabrication of Bimetallic Ag‐Co Nanoparticle Deposited on Hierarchical ZSM‐5 as a Selective Catalyst for Synthesis of Propargylamine in Water via Multicomponent A3 Coupling

“…Also, sharp peaks located in 2θ (degree) 7.9, 8.8, 23.3, 23.7, 24 are characteristic peaks of the crystalline structure of ZSM‐5 which are apparent in the XRD pattern of Ag−Co/Hi‐ZSM‐5 and signifying the crystalline structure of Hi‐ZSM‐5 has conserved after deposition of nanoparticles on the structure of the zeolite. Moreover, the XRD confirms the high purity of the prepared catalyst and successful production of the catalyst without significant oxides or other impurity phases …”

Catalytic Conversion of 1‐butene over Modified Versions of Commercial ZSM‐5 to Produce Clean Fuels and Chemicals

“…Acid treatment . The desilicated materials MZS‐x, MZS‐TPA‐y and MZS‐TPA/Na were treated with hydrochloric acid (removal of inorganic debris from the pores), or oxalic acid (removal of extra‐framework aluminum species, likely located closer to the external surface) . Specifically, a 0.8 M aq.…”

“…This may be accomplished with the introduction of mesoporosity in zeolites via bottom‐up or top‐down synthetic approaches . In the former case, mesoporosity is formed by hard templating (e. g. carbonaceous or polymeric compounds), soft templating (e. g. surfactants, organosilanes), or indirect templating methods (e. g. steam‐assisted and solid‐phase crystallization) . In top‐down approaches, mesoporosity is introduced by strategically removing framework atoms from pre‐made zeolites; e. g. desilication via alkaline treatment, and dealumination via acid treatment or steaming at high temperature .…”

“…[23][24][25][26][27][28][29] In the former case, mesoporosity is formed by hard templating (e. g. carbonaceous or polymeric compounds), [30][31][32] soft templating (e. g. surfactants, organosilanes), [33][34][35] or indirect templating methods (e. g. steam-assisted and solid-phase crystallization). [36][37][38] In top-down approaches, mesoporosity is introduced by strategically removing framework atoms from pre-made zeolites; e. g. desilication via alkaline treatment, [39][40][41][42] and dealumination via acid treatment or steaming at high temperature. [39,[42][43][44][45] The top-down strategies are advantageously cheaper, relatively easy to reproduce and scale-up for larger production.…”

Palladium supported on metal–organic framework as a catalyst for the hydrogenation of nitroarenes under mild conditions

“…The second is catalytic hydrogenation of nitro compounds over supported metal catalysts, e.g. Au, Ni, Fe, Ru and Co catalysts. Nevertheless, the reported catalysts usually require harsh conditions, such as a high reaction temperature and a high hydrogen pressure .…”