Baker's yeast effluent is a major source of pollution with a high organic load and dark colour. It can be treated by using advanced oxidation processes (AOPs). AOPs, such as ultrasonic irradiation, are ambient temperature processes involving the generation of free radicals. We have investigated sonocatalytic treatment of baker's yeast effluent by using ultrasound. TiO2–ZnO composites were used as sonocatalysts to increase the efficiency of the ultrasonic irradiation. The TiO2/ZnO composite was prepared by two different methods. Ultrasonic irradiation or mechanical stirring was used to prepare the TiO2–ZnO composite, and an ultrasonic homogenizer with a 20 kHz frequency was used to treat the baker's yeast effluent. We studied the effects of several parameters, including the molar ratio of TiO2/ZnO, calcination temperature, calcination time and catalyst amount, on the sonocatalytic treatment of the effluent. According to the results, the decolorization rate was 25% when using the composite TiO2/ZnO prepared at a 4:1 molar ratio and treated at 700 °C for 60 min, and the optimum catalyst amount was 0.15 g/l.
What is TPO and Why is it Performed?
Temperature programmed oxidation (TPO) is an analytical technique capable of establishing the oxidation of an element or compound through thermal excitation, with various applications in the field of catalysis. The performance of TPO requires a furnace or microreactor capable of increasing temperatures of a catalyst in precise increments up to extreme conditions, for example in brackets of 1-20°C up to 1000°C. An integrated mass spectrometer allows for constant real-time analysis of catalytic activity...
What is Catalysis?
Catalysis is the process of modifying a chemical reaction with the use of a catalyst. This process only works with chemicals that have an existing reaction, and it is used to accelerate the reaction for commercial purposes. Catalysis occurs faster than a standard chemical reaction because catalysts require less activation energy, which is the minimum level of energy necessary to initiate a chemical reaction. Catalysis Working Principle When a chemical is placed with a catalyst, there is a reduction in the...
CPI Installs Catalytic Oxidizer at East Coast Bakery
Catalytic Products International (CPI) installed a VECTOR Series Catalytic Oxidizer at an East Coast Bakery for the abatement of Volatile Organic Compounds (VOCs). CPI worked closely with the end user customer along with their Engineering, Procurement, and Construction (EPC) firm to define, select, and engineer the equipment best suited to safely and effectively treat the emissions from the bakery lines. In this application the bakery oven exhaust contains VOC’s like ethanol that according to the US EPA...
CPI Installs Catalytic Oxidizer at Pharmaceutical Mfg Company
Catalytic Products International (CPI) recently completed the installation of a new VECTOR Series Catalytic Oxidizer (CatOx) at a Western USA manufacturer of pharmaceutical products for the abatement of Volatile Organic Compounds (VOCs). This new CPI VECTOR-15,000 Catalytic Oxidizer replaces an older 14,600 scfm oxidizer from a competitor which was used to treat the exhaust from two (2) fluidized bed coating processes. The existing oxidizer suffered serious internal degradation and heat damage due to burner...
Transition metals cobaltites spinel for depollution of NOₓ emissions using SCR technology
Abstract The catalytic performance of various transition metal (M = Cu, Mn, and Ni) cobaltites prepared by nanocasting method were investigated for the selective catalytic reduction (SCR) of NO under lean burn conditions. KIT-6 was used as a hard template in the nanocasting method for preparation of catalysts. The catalyst samples were characterized by various techniques such as XRD, low-temperature N2 physisorption, SEM-EDS, and XPS. The catalysts were examined for the SCR of NO by NH3 and H2-LPG in a packed...