Low-overpotential electrochemical ammonia synthesis using BiOCl-modified 2D titanium carbide MXene

This work relates to the field of thermophysical parameters of refractory interstitial alloys. The isochoric heat capacity of cubic titanium carbide TiCx has been calculated within the Debye approximation in the carbon concentration range x = 0.70–0.97 at room temperature (300 K) and at liquid nitrogen temperature (80 K) through the Debye temperature established on the basis of neutron diffraction analysis data. It has been found out that at room temperature with decrease of carbon concentration the heat capacity significantly increases from 29.40 J/mol·K to 34.20 J/mol·K, and at T = 80 K – from 3.08 J/mol·K to 8.20 J/mol·K. The work analyzes the literature data and gives the results of the evaluation of the high-temperature dependence of the heat capacity СV of the cubic titanium carbide TiC0.97 based on the data of neutron structural analysis. It has been proposed to amend in the Neumann–Kopp formula to describe the high-temperature dependence of the titanium carbide heat capacity. After the amendment, the Neumann–Kopp formula describes the results of well-known experiments on the high-temperature dependence of the heat capacity of the titanium carbide TiCx. The proposed formula takes into account the degree of thermal excitation (a quantized number) that increases in steps with increasing temperature.The results allow us to predict the thermodynamic characteristics of titanium carbide in the temperature range of 300–3000 K and can be useful for materials scientists.

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Electron Donation by Low-Crystalline Ba-La-Ce Oxygen-Deficient Composite Oxide Accumulating on Ru Nanoparticles for Ammonia Synthesis under Mild Conditions

10.26434/chemrxiv.7763657.v1 ◽

2019 ◽

Author(s):

Katsutoshi Sato ◽

Shin-ichiro Miyahara ◽

Yuta Ogura ◽

Kotoko Tsujimaru ◽

Yuichiro Wada ◽

...

Keyword(s):

Ammonia Synthesis ◽

Bond Cleavage ◽

Synthesis Process ◽

Strong Electron ◽

Mild Conditions ◽

Ru Nanoparticles ◽

Rate Determining Step ◽

Highly Active ◽

Composite Oxides ◽

Low Crystalline

To mitigate global problems related to energy and global warming, it is helpful to develop an ammonia synthesis process using catalysts that are highly active under mild conditions. Here we show that the ammonia synthesis activity of Ru/Ba/LaCeOx pre-reduced at 700 °C is the highest reported among oxide-supported Ru catalysts. Our results indicate that low crystalline oxygen-deficient composite oxides, which include Ba2+, Ce3+ and La3+, with strong electron-donating ability, accumulate on Ru particles and thus promote N≡N bond cleavage, which is the rate determining step for ammonia synthesis.

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Electron Donation by Low-Crystalline Ba-La-Ce Oxygen-Deficient Composite Oxide Accumulating on Ru Nanoparticles for Ammonia Synthesis under Mild Conditions

10.26434/chemrxiv.7763657 ◽

2019 ◽

Author(s):

Katsutoshi Sato ◽

Shin-ichiro Miyahara ◽

Yuta Ogura ◽

Kotoko Tsujimaru ◽

Yuichiro Wada ◽

...

Keyword(s):

Ammonia Synthesis ◽

Bond Cleavage ◽

Synthesis Process ◽

Strong Electron ◽

Mild Conditions ◽

Ru Nanoparticles ◽

Rate Determining Step ◽

Highly Active ◽

Composite Oxides ◽

Low Crystalline

To mitigate global problems related to energy and global warming, it is helpful to develop an ammonia synthesis process using catalysts that are highly active under mild conditions. Here we show that the ammonia synthesis activity of Ru/Ba/LaCeOx pre-reduced at 700 °C is the highest reported among oxide-supported Ru catalysts. Our results indicate that low crystalline oxygen-deficient composite oxides, which include Ba2+, Ce3+ and La3+, with strong electron-donating ability, accumulate on Ru particles and thus promote N≡N bond cleavage, which is the rate determining step for ammonia synthesis.

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USE OF DOUBLE VOIGT METHOD IN X-RAY DIFFRACTION STUDY OF THE MICROSTRUCTURE OF THE TITANIUM CARBIDE NANOPOWDERS PRODUCED BY PLASMA-CHEMICAL SYNTHESIS

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2017-83-12-34-37 ◽

2017 ◽

Vol 83 (12) ◽

pp. 34-37

Author(s):

V. P. Sirotinkin ◽

V. F. Shamray ◽

A. V. Samokhin ◽

M. A. Sinaiskiy

Keyword(s):

Chemical Synthesis ◽

Titanium Carbide ◽

Diffraction Study ◽

X Ray Diffraction ◽

Plasma Chemical ◽

Plasma Chemical Synthesis ◽

X Ray

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Effect of matrix on properties of cermet plasma coatings based on titanium carbide

Perspektivnye Materialy ◽

10.30791/1028-978x-2019-8-53-64 ◽

2019 ◽

pp. 53-64

Author(s):

V. I. Kalita ◽

◽

G. A. Pribytkov ◽

D. I. Komlev ◽

V. V. Korzhova ◽

...

Keyword(s):

Titanium Carbide ◽

Plasma Coatings

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Effect of Titanium Carbide Particles on Mechanical Properties of Aluminum Matrix Composites

Wasit Journal of Engineering Sciences ◽

10.31185/ejuow.vol5.iss2.55 ◽

2017 ◽

Vol 5 (2) ◽

pp. 20-30

Author(s):

Zaman Khalil Ibrahim

Keyword(s):

Mechanical Properties ◽

Titanium Carbide ◽

Compression Strength ◽

Volume Fraction ◽

Aluminum Matrix ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Powder Metallurgy Technique ◽

Carbide Particles ◽

Properties Of Composites

In this research aluminum matrix composites (AMCs) was reinforced by titanium carbide (TiC) particles and was produced. Powder metallurgy technique (PM) has been used to fabricate AMCs reinforced with various amounts (0%, 4%, 8%, 12%, 16% and 20% volume fraction) of TiC particles to study the effect of different volume fractions on mechanical properties of the Al-TiC composites. Measurements of compression strength and hardness showed that mechanical properties of composites increased with an increase in volume fraction of TiC Particles. Al-20 % vol. TiC composites exhibited the best properties with hardness value (97HRB) and compression strength value (275Mpa).

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KENTANIUM K138A

Alloy Digest ◽

10.31399/asm.ad.ti0040 ◽

1964 ◽

Vol 13 (7) ◽

Keyword(s):

Fracture Toughness ◽

Compressive Strength ◽

High Temperature ◽

Titanium Carbide ◽

Physical Properties ◽

Engineering Design ◽

High Temperatures

Abstract Kentanium K138-A is a high temperature titanium carbide that greatly widens the scope of the engineering design where conditions of intermittent or continuous high temperatures in oxidizing atmospheres are combined with abrasion, and compressive or tensile loads. This datasheet provides information on composition, physical properties, hardness, elasticity, and compressive strength as well as fracture toughness, creep, and fatigue. It also includes information on machining and joining. Filing Code: Ti-40. Producer or source: Kennametal Inc..

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FERRO-TIC MS-5

Alloy Digest ◽

10.31399/asm.ad.ts0269 ◽

1974 ◽

Vol 23 (4) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Titanium Carbide ◽

Physical Properties ◽

Martensitic Stainless Steel ◽

Operating Temperature ◽

Heat Treating ◽

Steel Matrix ◽

Unique Combination ◽

Food Industries

Abstract FERRO-TIC MS-5 is comprised of ultrahard titanium carbide grains cemented by an age-hardenable martensitic stainless steel matrix. Its unique combination of wear, heat and corrosion resistance and toughness make it well suited for abrasion-resistant components in the aerospace, chemical and food industries. Its maximum operating temperature is 850 F. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as creep. It also includes information on corrosion resistance as well as forming, heat treating, machining, and surface treatment. Filing Code: TS-269. Producer or source: Chromalloy Metal Tectonics Company.

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