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Spent FCC catalyst: Potential anti-corrosive and anti-biofouling material
Palak A. Trivedi,Parimal A. Parikh,Preeti R. Parmar 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
To combat corrosion and biofouling in chemical and marine industries with green and cheap material many efforts are put. Efficacy of spent FCC catalyst coating was studied for these purposes. Its corrosion resistance against corrosive media was examined up to 80 8C and 6 h by two methods. They indicated high corrosion inhibition efficiency. Antibacterial and antibiofouling activity of zeolite was studied for bacteria isolated from seawater. Zeolite coating was subjected to cooling water to observe antifouling behaviour and the performance was found to improve upon some modifications. The metal deposited on zeolite did not leach away in stagnant and flowing waters.
Investigation on corrosion control of mild steel buried in soil by spent FCC catalyst coating
Palak A. Trivedi,Nikunj M. Solanki,Naresh Butani,Parimal A. Parikh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Effects of aerobic and anaerobic bacteria on corrosion behaviour of mild steel coated with modified spent FCC catalyst have been examined in soil extract solutions (SES) and that buried in soil. Coating of modified spent FCC catalyst was found to inhibit the growth of bacterial isolates from the soil which is represented as zone of inhibition. Efficacy of spent FCC catalyst was studied for the coated coupons immersed in SES. Cracks and interstices were found on uncoated coupons due to corrosion whereas coated surface remained unaffected. This is confirmed by the SEM analysis. It was also seen that coated coupon was undamaged under buried-in-soil conditions for 30 days.
Mayuri N. Katariya,Parimal A. Parikh,Arun K. Jana 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Zeolite ZSM-5 coating on mild steel had been assessed for its corrosion resistance property against organic acids, namely, acetic acid, formic acid and citric acid of varying concentrations at temperatures up to 60 8C under stagnant as well as stirred conditions by weight-loss and polarization methods. Biocidal activity of the zeolite coating against Gram-negative bacteria Escherichia coli, Pseudomonas putida,Salmonella typhi and Gram-positive bacteria Staphylococcus aureus by using minimum inhibitory concentration (MIC) was also studied. With zeolite coating, corrosion inhibition efficiency up to 98% was achieved for 6 h of duration of contact between coating and acid solutions. Similar resistance persisted for the duration of 7 days too. Results obtained showed that extent of corrosion of mild steel decreased in the order, formic acid > citric acid > acetic acid. Also as expected, corrosion resistance though only slightly,decreased with solution temperature and concentration. High anti-microbial activity was observed at very low values of MIC (100 mg/mL). In light of reported literature, the presence of the structure directing agent within the channels of the zeolite has been attributed for the high corrosion resistance as well as anti-microbial activity observed here. Thus, zeolite offers a ‘‘greener’’ alternate to chromium and epoxy polymers based corrosion resistance coating.
Hollow mesoporous silica spheres supported Ag and Ag–Au catalyzed reduction of 4-nitrobenzo-15-crown
Raji Vadakkekara,Mousumi Chakraborty,Parimal A. Parikh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Hollow mesoporous silica (HMS) spheres of size within the range 120–220 nm have been prepared usingpropanol–water solvent as template and cetyltrimethylammonium bromide (CTAB) as stabilizer. HMSsupported silver and silver–gold catalysts were prepared by impregnating metal nanoparticles on HMSand were characterized by ultraviolet–visible spectroscopy (UV–vis), dynamic light scattering (DLS),optical microscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transforminfrared spectroscopy (FTIR), inductive coupled plasma optical emission spectroscopy (ICP-OES) and N2adsorption–desorption. The reduction of 4-nitrobenzo-15-crown (4-NB-15-C) was compared using HMSsupported silver and silver–gold nanocatalysts varying experimental parameters. Bimetallic Ag–Au/HMS nanocatalysts was found to be more active than monometallic Ag/HMS nanocatalyst.
Bioethanol valorization via its gas phase oxidation over Au &/or Ag supported on various oxides
Paresh H. Rana,Parimal A. Parikh 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Au and Ag nanoparticles supported on CeO2, SiO2 and ZrO2 were examined for bioethanol oxidation withair. Catalysts prepared were characterized by powder X-ray diffraction, transmission electronmicroscopy, scanning electron microscopy and Fourier transform infrared spectroscopy. Catalyticbehavior was evaluated between 200–350 C and 5 atm with gas hourly space velocity of 18,000 mLgcat1 h 1. Au/ZrO2 and Au/CeO2 were found to be more active than other catalysts. Less activity ofAg/ZrO2 and Au–Ag/ZrO2 is attributed to facile oxidation of Ag under aerobic conditions. Acetaldehydeselectivity follows the order: Au/CeO2 > Ag/ZrO2 > Au–Ag/ZrO2 > Au/ZrO2 > Au/SiO2 under optimalconditions.