Catalyst Development

Categories: Atmosphere

The majority of research has focused on the development of transition metal-containing catalysts, because transition metal gives variable oxidation state, increasing oxidation state, decreasing size, and increasing Lewis acidity of the metal ion. Why? Not use isomorphous metal ion substitution or incorporated in the framework of polymeric silicate material without loss of its property to generate news catalyst such as RS-1. The development of Ruthenium silicate (RS-1), ruthenium Ru(III) metal-containing zeolite catalyst can be synthesized in the laboratory, it is interesting as well as quite challenging work.

Here we are accepting the challenge and trying to synthesize a series of RS-1 by hydrothermal method with different ratios and its, catalytic activity studies in different organic transformation reactions.

The incorporation of ruthenium metal ion into zeolites framework has been reviewed in a recent report it gives ZSM-5 type structural morphology and MFI topology [1-4]. Transition metal-containing zeolite catalyst material shows good catalytic activity over a long range of temperatures and is more resistant to the thermal paths.

After completion of reaction remains as it is, without loss of their catalytic activity, so we call them reusable catalysts. Thus, the transition metal ruthenium Ru(III) shows the good catalytic activities in the various catalytic processes, such as metal hydride transfer reactions i.e hydrogenation reactions provide a widely-used alternative to direct hydrogenation reactions [5-6], use of alcohols as alkylating agents, as well as oxidation-reduction reaction. Ruthenium metal-containing catalyst also used in name reaction of cross aldol condensation reaction in hormone steroid dia-stereo-selective direct Aldol reaction.

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[13] Syntheses of enantiomeric pure pyrrolidine derivatives under very mild conditions Lewis acid assisted ring-closing olefin metathesis (RCM) reaction. [14] In C-H activation[15], asymmetric transfer hydrogenation to ketones, etc.[16] Ruthenium metal (Ru) containing catalyst is used in many more organic transformation reactions.

The elemental composition, structural morphology, crystal phase, properties, and various parameter of the catalyst were examined by Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), Powder X-ray Diffraction (XRD). As well as surface morphology and its parameter analyses by using Nitrogen Adsorption (BET), Energy Dispersive X-ray/ Spectroscopy Analysis (EDX/ EDS). Total acidity such as Lewis and Bronsted acidity is calculated by Temperature Programmed Desorption (NH3-TPD). Synthesized ruthenium silicate (RS-1) has given uniform hexagonal long rod shapes, and highly crystalline morphology with similar structural morphology as ZSM-5 type and MFI topology.

Here we are reporting the first time preparing a ruthenium silicate (RS-1) catalyst and using it as a catalyst for the synthesis of 2-Arylbenzothiazole, pyramid-[2,1-b]-benzothiazole, 2-benzylidene-malononitrile, α- amino phosphonate derivative.

Experimental

Synthesis of series on ruthenium silicate (RS-1) by hydrothermal method.

The transition metal ruthenium (Ru3+) containing ruthenium silicate (RS-1) zeolite was prepared by hydrothermal method. It was prepared by using universal solvent, Ruthenium Trichloride (RuCl3), and tetraethyl orthosilicate (TEOS). A solution of tetraethyl orthosilicate 20.83 mL and tetrapropyl ammonium hydroxide (TPA-OH) 20 mL, 20% was added dropwise with vigorous stirring, the resulting mixture was stirred for 10 min at room temperature to obtain silica sol. Ruthenium Trichloride (RuCl3) 0.2614 gm was mixed with 30 mL of dry isopropyl alcohol and stirred vigorously for 10 min, resulting mixture was added dropwise in silica sol with constant stirring at 70–75°C for 120 min. The pH of the final gel was maintained at about 12 by adding TPAOH and deionized water as a solvent. The viscous gel was formed that was transferred in Teflon lined stainless steel autoclave, treated hydrothermally under a static condition, and under autogenous pressure at 175°C for 24 h. A solid product was filtered and dried in an oven at 100°C for 1 h. Finally, the dried product was calcined in a muffle furnace at 500°C for 4 h under an air atmosphere. The resulting material was naturally cooled, characterized, and named RS-1 zeolite.

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Catalyst Development. (2022, May 28). Retrieved from http://envrexperts.com/free-essays/essay-about-616758

Catalyst Development
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