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Study on the Performance of Ag ₂Cu ₁/H⁃ZSM⁃5 Alloy Catalyst in NH ₃⁃SCO Reaction

Zhou Mingdong，Sun Qiang Bai Jifeng，Wang Jingyun

Abstract （485）

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In order to investigate the catalytic effect of H⁃ZSM⁃5 for silver⁃copper alloy nanoparticles,Ag ₂Cu ₁/H⁃ZSM⁃5 alloy powder catalyst was prepared and applied to low temperature NH ₃⁃SCO reaction under oxygen⁃rich conditions. The results showed that the Ag ₂Cu ₁/H⁃ZSM⁃5 exhibited the best low⁃temperature ammonia oxidation performance, and its T ₅₀ and T ₉₀ were 221 and 247 °C, respectively. The results of XRD,N ₂ physical adsorption and SEM showed that the MFI skeleton structure and the silver⁃copper alloy structure remained intact,and the silver⁃copper alloy nanoparticles were highly dispersed on the surface of H⁃ZSM⁃5.It could be seen from TEM results that the small size of silver⁃copper alloy nanoparticles (2~14 nm) and H⁃ZSM⁃5 surface had a strong force,which improved the dispersion of silver⁃copper alloy nanoparticles.The XPS and NH ₃⁃TPD results displayed that the strong interaction between the Ag ₂Cu ₁nanoparticles and the surface of H⁃ZSM⁃5 increased the amount of active oxygen on the surface of the catalyst,enhanced the adsorption of ammonia on the surface and increased the reaction rate of ammonia oxidation.

2019, 32 (6): 14-21. DOI: 10.3969/j.issn.1006-396X.2019.06.003

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The Relationship between Viscosity and Sound Velocity of Straight Chain Alkanes

Sun Qiang, Wang Dan, Guo Xuqiang, Liu Aixian, Liu Xiaodong

Abstract （316）

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The calculation models for crude oil viscosityare complex because of the determination of physical data,the limited calculation accuracy and application scope. Consequently, some representative straight chain alkanes were taken as model compounds of crude oil, and their viscosity and sound velocity were measured under different temperatures and pressures in this work. The influences of temperature and pressure on the sound velocity of straight chain alkanes were investigated, and the correlation model between viscosity and sound velocity was built on the base of experimental results. The experimental results indicated that the sound velocity of straight chain alkaneslinearly decreased with the increase of temperature and the decrease of pressure. The relationship between viscosity and sound velocity of alkanes was exponential type, and the viscosity sound velocity correlation model was applied to three different oils in Jidong Oilfield. The calculation results demonstrated a satisfactory applicability of the model. So, a feasible method was provided to reduce the dependence of conventional viscosity models on the physical property parameters.

2016, 29 (1): 1-5. DOI: 10.3969/j.issn.1006-396X.2016.01.001

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The Experimental and Modeling Studies on the Diffusion Coefficient of CO ₂ in Pure Water

LIU Ai-xian, LIU Peng, SUN Qiang,et al

Abstract （1411）

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When carbon dioxide was injected into the seafloor, the diffusion coefficients of carbon dioxide in the water under different conditions, is one of the important parameters to decide whether liquid carbon dioxide or carbon dioxide hydrate can exist stably or not. In the project, the diffusion coefficients of carbon dioxide in the water were measured at 4~30 ℃, with the pressure under 1 MPa. The results show that the diffusion coefficient is a parameter related with concentration in high pressure condition. By Importing the indeterminate function to describe the process of diffusion related with concentration, the data that refers to diffusion coefficient of carbon dioxide-water system were obtained and the calculated mode that contains the relationships between carbon dioxides diffusion coefficient and temperature, concentration was fitted on the base of linear relation of short-time diffusing capacity and the root of time.

2012, 25 (6): 5-9. DOI: 10.3969/j.issn.1006-396X.2012.06.002