What happened when co treated with hydrogen in presence of the zinc oxide catalyst?
Answers
Answer:
hola mate gummie ✌❤❤
copper-zinc oxide-based catalyst (JGC Catal. Chem. Ltd.; Kanagawa, Japan, F04M) by a sol-gel method. An aqueous solution of ammonia (Kanto Chemical Co., Tokyo, Japan, 28 wt % solution, >99.0%) or L(+)-arginine (Wako Chemical Co., Osaka, Japan, >99.0%) were mixed with 0.5 g of F04M in ethyl alcohol, then tetraethoxysilane (Wako Pure Chem. Co., Osaka, Japan, >99.0%), zirconium butoxide (Sigma-Aldrich Co. St. Louis, MO, USA, LLC., 80 wt % solution in 1-butanol), or titanium-n-butoxide (Wako Pure Chem. Co., Osaka, Japan, >97.0%) was added to the solution, followed by stirring at 323 K for 3 h and centrifuging at a rotation speed of 6000 rpm for 5 min.
3.2. Characterization
The morphology of the oxide-coated catalysts was observed using a Hitachi FE2000 (Hitachi High-Tech. Co., Tokyo, Japan) transmission electron microscope (TEM) operated at an acceleration voltage of 200 kV. The temperature-programmed reduction–thermogravimetric analyses (TPR–TGA) were performed with a Rigaku TG8120 (Rigaku Co., Tokyo, Japan) instrument. TPR profiles were recorded by passing a 10 vol % H2 in Ar (260 mL·min−1) through the sample (~2 mg) heated at a constant rate of 5 K·min−1 up to 1173 K.
3.3. Catalytic Activity
The catalysts were evaluated in a tubular stainless steel, fixed-bed reactor (1/2′′ i.d) equipped with a temperature-programmed control unit and a K-type thermocouple. Each sample was loaded between two layers of quartz wool in the reactor. Before experiment, the catalyst was firstly pre-reduced at 553 K and atmospheric pressure in a hydrogen stream (1 vol % H2 in Ar) and cooled to desired temperature. Subsequently, synthesis gas (H2/CO2/Ar = 72/24/4 (molar ratio)) was introduced at W/F = 5 g·h−1·mol−1, at a pressure of 3.0 MPa using a mass flow controller (Brookhaven). The effluent gases were analyzed by two GC-TCD (Shimadzu GC-8A, Shincarbon ST column and Shimadzu GC-8A, FlusinT column). Conversion and selectivity were calculated by internal standard and mass-balance methods. CO2 conversion was calculated.
✌❤