Different amounts of MoO3-coated LNMO (LNMO-MoO3-x) materials were prepared using the precipitation method. Initially, a certain amount of (NH4)6Mo7O24 4H2O (99.0%, Alfa Aesar, Ward Hill, MA, USA) was dissolved in deionized water and constantly stirred for 3 h; subsequently, pristine LNMO powders were added. The suspension was dried at 80 °C overnight and sintered in air at 500 °C for 5 h in air to obtain LNMO-MoO3-x samples. The coating content on LNMO samples was optimized using 1, 2, and 3 wt.% of MoO3 layers and named LNMO-MoO3-1, LNMO-MoO3-2, and LNMO-MoO3-3, respectively.
Nh4 6mo7o24 4h2o
Manufactured by Thermo Fisher Scientific
Sourced in United States
Ammonium heptamolybdate tetrahydrate, (NH4)6Mo7O24 4H2O, is a chemical compound that serves as a source of molybdenum. It is a yellow crystalline solid used in various laboratory and industrial applications.
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4 protocols using nh4 6mo7o24 4h2o
1
Optimizing LNMO Cathode Materials via MoO3 Coating
2
In-Situ Growth of 1T-MoS2 on Carbon Fiber Paper
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80 mg thioacetamide and 50 mg (NH4)6Mo7O24·4H2O (Alfa Aesar) were dissolved in 10 mL DI water under sonication treatment for 20 min to form homogeneous solution. Afterwards the solution was transferred into a 25 mL Teflon autoclave, and CFP (1 × 2 cm2) was placed onto the bottom. The Teflon autoclave was heated at 180 °C for 24 h to give rise to the in situ growth of 1T-MoS2 on CFP substrate. In addition to the 1T-MoS2 grown on the CFP, the remained free 1T-MoS2 was collected by centrifugation and then was washed with DI water, ethanol and acetone (each for two times). The purified 1T-MoS2 was dried in thermal oven for overnight and ground into fine powders. Loading amount of 1T-MoS2 on CFP is quantified by 0.5 mg/cm2 by comparing the mass difference before and after hydrothermal growth.
3
Metal Chalcogenides-Loaded TiO2 Synthesis
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TiO2 Aeroxide p25 (ACROS ORGANICS), Cu(NO3)2⋅3H2O (> 95%), (NH4)6Mo7O24⋅4H2O (<95%) were obtained from Fisher chemicals, Na2S (99%, ALPHA CHEMICALS), C2H5NS (98%, Alfa Aesar), H2O2, methanol, and MB was obtained from Sigma–Aldrich. All the reagents were of analytical grade and used as received without further purification.
For comparison purposes metal chalcogenides MSx (CuS or MoS2) were loaded over TiO2 via two different methods, namely, hydrothermal treatment and coprecipitation methods. The detailed synthesis procedure is illustrated as follows.
For comparison purposes metal chalcogenides MSx (CuS or MoS2) were loaded over TiO2 via two different methods, namely, hydrothermal treatment and coprecipitation methods. The detailed synthesis procedure is illustrated as follows.
4
Preparation of Mo/Zeolite Catalysts
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Example 1
Mo/zeolite catalysts were prepared by incipient wetness impregnation of (NH4)6Mo7O24 4H2O (Fisher Scientific) aqueous solution with the ammonium form of either: 1) ZSM-5 (SiO2/Al2O3=23, 50, 80, and 280), 2) zeolite Y (SiO2/Al2O3=80) or zeolite β (SiO2/Al2O3=25) obtained from Zeolyst International. The designated Mo loading amount was 5 wt. % or 10 wt. %. The samples were finally calcined in air at 773 K for 3 h and pelletized into 0.25-0.5 mm particles for activity tests.
One detailed description of the preparation is as follows. Ninety-five (95) grams of H-ZSM-5 (SiO2/Al2O3=50) were treated with an aqueous solution of 9.5 g of (NH4)6Mo7O24.4H2O dissolved in 47.7 grams of distilled water. The amount of water used in this incipient wetness preparation was just sufficient to fill the pores of the H-ZSM-5. The resulting solid was dried at 110° C. for 18 hours before it was calcined for 3 h at 500° C. Other catalysts were prepared using H-ZMS-5 having SiO2/Al2O3=23, 80, and 280 and the protocol listed in this example.
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